Tomato Leafminer (Tuta absoluta) Control: How Should Importers Choose Insecticide Products?

The tomato leafminer Tuta absoluta, also known as Phthorimaea absoluta in the current EPPO classification, is a Lepidoptera pest that primarily infests tomatoes. Its larvae not only burrow into leaves to feed but can also damage young shoots and fruits, directly affecting tomato yield and market quality.

Effective management of Tuta absoluta cannot rely on a single insecticide. First, the pest species and life stage must be identified; then, appropriate products and control strategies must be selected based on local resistance patterns, IRAC groups, whether cultivation is in open fields or greenhouses, and fruit residue requirements.

For pesticide importers and distributors, there are three key issues that need to be addressed:

1. Is there a persistent and economically significant Tuta absoluta infestation in the local tomato market?
2. Which insecticide active ingredients still offer practical control value locally?
3. How can a product portfolio be established that meets market demand without increasing inventory or the risk of resistance due to redundancy in modes of action?

For example, chlorantraniliprole, emamectin benzoate, spinosad, and indoxacarb may all play a role in managing Tuta absoluta larvae in markets where they are registered, but their modes of action, application conditions, and commercial positioning are not entirely the same.

Therefore, this article does not simply list insecticides that can control the tomato leafminer; rather, it helps importers understand: why these products are chosen, when different IRAC groups are needed, and how to determine whether a new product is worth introducing into the local market.

Which pest does “Tomato Leafminer” refer to?

This is the first question that must be clarified before selecting a product.

In the international agricultural market, the term “Tomato Leafminer” is sometimes used to refer to Tuta absoluta, but it may also be used to describe pests such as Liriomyza that feed inside tomato leaves.

However, they are not the same insect.

What is the difference between Tuta absoluta and Liriomyza?

Comparison Criteria	Tuta absoluta	Liriomyza spp.
Major Classification	Lepidoptera	Diptera
Representative Species	Tuta absoluta / Phthorimaea absoluta	Liriomyza sativae, Liriomyza trifolii
Larval Type	Moth larvae	Fly larvae
Primary leaf damage	Often form irregular, patchy feeding tunnels	Often form slender, curved, serpentine feeding tunnels
Fruit damage	Larvae may bore into fruit	Damage is typically limited to leaf feeding
Pest Control Product Focus	Prioritize evaluation of active ingredients effective against Lepidoptera larvae	Prioritize evaluation of products suitable for controlling Diptera leafminers
Resistance Management	Based on the sensitivity of local Tuta species to IRAC groups	Based on the status of local Liriomyza populations

It should also be noted that some countries use the name “Tomato Pinworm.”

However, Tuta absoluta and Keiferia lycopersicella remain distinct pests, and one cannot simply apply the same product recommendations merely because their English common names are similar.

Why does accurate identification affect pesticide procurement?

Suppose an importer’s customer tells him:

“We have a lot of leafminers on our tomato leaves and need an insecticide.”

Without confirming the specific pest, the importer may choose the wrong product category.

For example, Cyromazine belongs to IRAC Group 17 and is primarily used in some markets to control certain leafminers of the order Diptera.

However, just because Tuta absoluta also forms mining tunnels does not mean Cyromazine can be directly used as a general control product for Tuta.

Similarly, certain Abamectin products that have proven effective in the Liriomyza market cannot be guaranteed to have the same efficacy against Tuta absoluta simply because they share the common term “leafminer.”

The correct procurement process should be: first confirm the scientific name of the pest, then check the active ingredient’s registration status, actual control scope, and local resistance patterns.

For further identification of different crops and types of leaf-mining pests, refer to SunAgro’s How to Control Leaf Miners in Crops.

Why does Tuta absoluta pose a significant threat to tomato production?

The most critical aspect of Tuta absoluta is not merely the presence of mining tunnels in the leaves.

It can cause damage at multiple stages of tomato growth, and once the larvae penetrate plant tissues, control efforts may become significantly more difficult.

Larvae can feed inside the leaves

After hatching, Tuta absoluta larvae may enter the interior of tomato leaves and feed on the mesophyll tissue between the upper and lower epidermis.

As the larvae develop, irregular transparent or brown damaged areas appear on the leaves.

In severe cases, multiple feeding tunnels may merge, causing extensive leaf damage.

This damage may affect:

• leaf photosynthesis;
• normal plant growth;
• tomato fruit development;
• overall plant productivity.

However, it is important to note that leaf mining galleries that have already formed will not disappear as a result of subsequent insecticide applications.

The role of insecticides is to control pests that are still alive and within the applicable treatment window, and to reduce subsequent new damage.

Larvae may also enter tomato fruits

This is a key distinction between Tuta absoluta and many common leafminers in terms of commercial impact.

Tuta larvae not only damage leaves but may also penetrate the interior of tomato fruits.

Infected fruits may exhibit:

• Boreholes on the fruit surface;
• Feeding damage inside the fruit;
• Damage to market appearance;
• Risk of secondary rot;
• Decrease in the proportion of marketable fruit.

For the fresh tomato market, even if the plants have not completely withered, a small number of fruit borings can directly affect the market grade.

Therefore, when evaluating the effectiveness of Tuta control measures, one cannot rely solely on the health of the leaves; it is also necessary to consider whether new fruit damage has been effectively reduced.

This is particularly important for professional greenhouse growers, fresh tomato growers, and the export tomato market.

Why does Tuta absoluta persist?

Under favorable conditions, Tuta absoluta can reproduce continuously and produce multiple generations within a single tomato growing cycle.

If host plants are left in the greenhouse for extended periods, or if suitable hosts persist in the surrounding open fields, the pest may reoccur repeatedly.

This also means:

Even if a single application is effective, larvae may reappear due to new egg-laying, hatching, or migration.

Therefore, newly discovered galleries should not automatically be interpreted as a failure of the previous treatment.

For information on other pests, diseases, and management needs throughout the tomato growing season, please refer to SunAgro’s Tomato Crop Protection Solutions

When should Tuta absoluta management begin?

The key to managing Tuta absoluta is early detection and determining whether treatment is necessary based on actual pest levels and crop risk, rather than waiting until a large number of fruits have already been damaged before searching for an effective insecticide.

However, “early detection” does not mean “spraying immediately upon seeing the first adult.”

Making the correct judgment also requires considering field conditions.

Why focus on eggs and young larvae?

Once Tuta larvae enter the interior of leaves or fruit, they may be protected by plant tissue.

At this stage, whether a standard contact treatment can deliver a sufficiently effective dose to the pests may become a limiting factor.

In contrast, managing susceptible larvae within the appropriate early treatment window typically makes it easier to reduce subsequent damage to leaves and fruit.

Therefore, farmers need to promptly determine:

• Whether new egg masses or eggs have appeared;
• Whether live larvae are present;
• Whether larvae have already entered feeding tunnels;
• Whether fruit damage has begun to appear;
• Whether fresh damage continues to appear in the field;
• Whether the local action threshold has been reached.

The modes of action and registration requirements for different insecticides may vary; therefore, not all products can be described as effective only against the same larval stage.

Can pheromone traps directly determine the timing of pesticide application?

Pheromone traps are important monitoring tools, but the decision to apply pesticides should not be based solely on the number of adult insects captured.

Pheromone traps can typically help determine:

• whether adult activity has begun;
• whether pest activity trends are changing;
• whether persistent outbreaks exist in certain areas;
• whether the frequency of field inspections needs to be increased.

However, trap counts are also influenced by the attractant, trap type, placement location, environment, and management practices.

Furthermore, the number of adults trapped does not necessarily correspond to the number of larvae present in leaves and fruits.

Therefore, decisions should be based on a combination of trap data, plant inspections, live larvae counts, and local action thresholds.

It is not possible to provide a single, universal figure for all tomato markets specifying “how many weekly captures require spraying.”

At which growth stage of tomato should Tuta be a primary concern?

Tuta can pose a risk at multiple growth stages, but the economic impact varies by stage.

Tomato Growth Stages	Issues to Monitor	Primary Management Objectives
Seedling Stage and Pre-Transplanting	Whether seedlings carry pests	Prevent introduction or spread via seedlings
Transplanting and vegetative growth stage	Fresh galleries, larval activity	Early detection and prevention of population establishment
Flowering and fruit-setting stage	Damage to leaves and tender shoots; risk to early fruits	Reduce sustained reproduction and new fruit damage
Fruit enlargement stage	Larval fruit boring	Protect the quality of marketable fruit
Continuous harvesting period	New outbreak cycle, PHI, residues	Balancing pest management and harvesting under legal usage conditions

Each stage in the table presents risks that require attention, but this does not mean insecticides must be applied at every stage.

For importers, it is more important to understand when major local infestations occur and then determine whether their product lines offer corresponding value for use.

Which active ingredients are suitable for inclusion in a Tuta absoluta insecticide product line?

Tuta absoluta can be managed using insecticides with various modes of action, but there may be significant differences across countries in terms of registration, resistance, and actual product performance.

A product line should not be planned based solely on the names of active ingredients; instead, it should also consider the IRAC Group, local susceptibility, product use, and commercial positioning.

Key Candidate Active Ingredients for Tuta absoluta

Active Ingredient	IRAC Group	Potential Product Role	Points Importers Need to Confirm
Chlorantraniliprole	Group 28	Key candidate for Lepidopteran larval control	Group 28 resistance, tomato registration, local efficacy
Cyantraniliprole	Group 28	Positioned for multi-pest management in some markets	Group overlap with Chlorantraniliprole
Emamectin Benzoate	Group 6	Larval control strategy with a different mode of action	Local susceptibility, application window, formulation
Spinosad	Group 5	Bio-based insecticide strategy	Target pest susceptibility, registration, and cost
Spinetoram	Group 5	Alternative commercial product strategy for Group 5	Overlaps with Spinosad in mode of action
Indoxacarb	Group 22A	Supplementary candidate products with different modes of action	Local registrations, resistance, and regulatory restrictions
Lufenuron	Group 15	Larval development management approach	Suitability for target instars and registration
Chlorfenapyr	Group 13	Complementary chemical control approach in select markets	Registration, resistance, crop safety, and impact on natural enemies
Bacillus thuringiensis	Group 11A (applicable insecticidal protein category)	Biological control and larval management	Strains, potency, insect life stages, local susceptibility

This is a technical screening table for the product line and does not imply that all active ingredients have already obtained registration for Tuta absoluta on tomatoes in every country.

Chlorantraniliprole: Core Candidate Product in Group 28

Chlorantraniliprole belongs to IRAC Group 28 and acts on the ryanodine receptor in insects, disrupting normal calcium ion regulation in muscles.

When susceptible larvae are exposed to a sufficiently effective dose, they may exhibit reduced or ceased feeding, abnormal behavior, and subsequent death.

For importers, its value lies not simply in “rapid insecticidal action.”

More importantly:

It can play a defined role in the management of Lepidoptera larvae under appropriate registration and pest susceptibility conditions.

However, chlorantraniliprole is not a product without the risk of resistance.

In some regions, a decline in Tuta absoluta’s susceptibility to chlorantraniliprole has been documented, and cross-resistance with other diamide products has even emerged.

Therefore, if Group 28 products are already being used extensively in a given area, the decision to continue adding similar products should not be based solely on market recognition.

SunAgro’s Chlorantraniliprole 300 g/L SC can serve as a reference for specific product specifications and supply options. Actual applications for Tuta absoluta control on tomatoes still require confirmation based on registrations in the target country.

Emamectin Benzoate: Another Larvicidal Option in Group 6

Emamectin Benzoate belongs to IRAC Group 6.

It disrupts the nervous and muscular activity of susceptible larvae by affecting the insects’ glutamate-gated chloride channels.

For importers who already carry Group 28 products, a key benefit of Emamectin Benzoate is that it offers an alternative candidate with a different mode of action.

However, this does not mean that:

All Tuta populations resistant to chlorantraniliprole are certainly susceptible to emamectin benzoate.

Whether these products are suitable for the local market still depends on actual resistance records, registered uses, formulations, and control costs.

Spinosad and Spinetoram: Both Belong to Group 5

Spinosad and Spinetoram both belong to IRAC Group 5.

Although they are not the same active ingredients, they share the same primary mode of action category.

If a distributor is already selling Spinosad, adding Spinetoram may offer different product performance, formulation options, or commercial positioning value.

However, the two should not be marketed as a resistance rotation between different IRAC Groups.

For the Tuta product line, whether it is necessary to carry both Group 5 products simultaneously should be determined by actual local demand.

Indoxacarb: A Complementary Option in Group 22A

Indoxacarb belongs to IRAC Group 22A and primarily acts by affecting voltage-gated sodium channels in insects.

In markets where it is registered and pest populations remain susceptible, it can be evaluated as an alternative mode of action.

However, importers still need to verify:

• Whether it is permitted for local tomato applications;
• Whether it is registered for Tuta absoluta;
• Whether local populations have developed resistance to Indoxacarb;
• Whether there are any regulatory restrictions;
• Whether the product cost is suitable for the target customers.

Therefore, its value lies not merely in “controlling larvae,” but in whether it can truly supplement control functions currently missing from the product line.

Why might the same resistance issues still arise with different insecticides?

A prominent challenge in managing Tuta absoluta is its ability to produce multiple consecutive generations under suitable conditions.

Long-term, repeated use of insecticides with the same mode of action may create sustained selective pressure for resistance.

This leads to a question that often confuses distributors:

Why hasn’t the effectiveness improved even though farmers have clearly switched pesticides?

One possibility is that, although the brand name has changed, the product actually used still belongs to the same IRAC Group.

Which products do not constitute rotation between different Groups?

Product combinations	IRAC Group	Does it belong to a different Group?
Chlorantraniliprole + Cyantraniliprole	28 + 28	No
Chlorantraniliprole + Flubendiamide	28 + 28	No
Emamectin Benzoate + Abamectin	6 + 6	No
Spinosad + Spinetoram	5 + 5	No
Chlorantraniliprole + Emamectin Benzoate	28 + 6	Yes
Emamectin Benzoate + Indoxacarb	6 + 22A	Yes
Spinosad + Chlorantraniliprole	5 + 28	Yes

The term “different Group” here simply indicates that the primary modes of action differ.

It does not prove that these products will necessarily be effective against all local populations, nor does it imply that they can be freely mixed or used consecutively without regard to label restrictions.

Why does Group 28 require special attention?

Group 28 diamide products have been in use for a long time in many agricultural markets.

With continued use, some Tuta absoluta populations have already shown reduced susceptibility.

A study of Tuta absoluta populations in different regions of China found that some populations exhibited significantly reduced susceptibility to chlorantraniliprole; the resistant strains established in the study also showed cross-resistance to other diamide products.

This indicates:

In some regions, if Tuta has developed significant resistance to a particular Group 28 product, simply switching to another Group 28 product may not necessarily solve the problem.

However, this does not mean that Group 28 products have lost their value in all regions worldwide.

Proper assessment should be based on local resistance monitoring and actual control performance.

How should IRAC Group management be conducted?

IRAC resistance management for Tuta absoluta emphasizes the need to consider pest generations, application windows for different modes of action (MoA), and other integrated pest management (IPM) measures to reduce long-term reliance on a single mode of action.

For distributors, it is recommended to focus on confirming the following:

• Which IRAC Groups have already been used against Tuta in the local area;
• Which active ingredients remain effective in practice;
• Whether cross-resistance exists against certain Groups;
• How many treatment windows are typically required during a tomato growing cycle;
• The number of applications, application intervals, and application methods permitted by the product label;
• Whether any biological control measures are available.

It is not recommended to adopt a one-size-fits-all approach for all countries:

“Chlorantraniliprole in the first week, Emamectin Benzoate in the second week, and Spinosad in the third week.”

This approach ignores pest generation cycles, actual pest population densities, local label requirements, and resistance status.

For differences between Group 28 and Group 6 products, refer to SunAgro’s Chlorantraniliprole vs. Emamectin Benzoate.

Do greenhouse and field-grown tomatoes require the same Tuta control products?

Not necessarily.

Even if the target pests are the same, there may be differences between greenhouse and field tomatoes in terms of pest entry routes, production cycles, harvest schedules, and integrated pest management conditions.

Therefore, importers should evaluate these two markets separately.

Key Differences Between Greenhouse and Field Tomatoes

Evaluation Criteria	Greenhouse Tomatoes	Field Tomatoes
Pest Entry	Seedlings, ventilation openings, facility management, etc.	Surrounding hosts, migration from fields, etc.
Growing Cycle	May be longer or involve continuous production	Depends on local seasons and cropping systems
Monitoring Methods	Trapping inside facilities, plant inspections	Field inspections, pheromone monitoring
Biological Control	May involve the targeted release of natural enemies	Can be combined with local natural enemies
Spraying Environment	Crop canopy, greenhouse space, and equipment have a significant impact	Environmental factors such as wind, rain, and temperature have a significant impact
Harvesting Requirements	May involve continuous, high-frequency harvesting	Determined by variety and market
Residue Risk	Special attention to PHI and continuous harvesting	Must also comply with PHI and MRL
Product Registration	Must confirm use for protected cultivation	Must confirm use for open-field cultivation

Why is IPM even more critical in greenhouses?

In greenhouse tomato production, Tuta may occur simultaneously with pests such as whiteflies, thrips, and mites.

Some specialized greenhouses have already adopted the following measures:

• Pheromone monitoring;
• Insect-proof netting;
• Clean seedlings;
• Release of natural enemies;
• Removal of infested plant material;
• Selective chemical control.

For example, in suitable greenhouse biological control systems, predatory insects such as Macrolophus pygmaeus can help manage certain pests.

If insecticides that significantly impact these natural enemies are repeatedly used to control Tuta, they may disrupt the existing integrated pest management (IPM) system.

Therefore, when selecting insecticides, greenhouse operators must consider not only their effectiveness against the target pest but also:

Whether the product is suitable for the local IPM system currently in use.

It is not appropriate to simply claim that a particular insecticide is “safe for all natural enemies,” as different beneficial insects and different exposure conditions may result in varying responses.

Why is it particularly important to check the PHI and MRL for greenhouse products?

Some greenhouse tomato crops are harvested continuously.

If an insecticide’s PHI does not align with the actual harvesting schedule, it may be difficult to incorporate into that production system—even if it is effective against Tuta.

Additionally, for tomatoes intended for export:

Local registration does not automatically mean compliance with MRLs in all destination markets.

When selecting products, importers must individually verify:

• Local registration requirements;
• PHI;
• MRLs for target export markets;
• current harvest frequency;
• whether other residue limits exist;
• the number of applications permitted locally.

These factors may be more important than simply comparing pesticide prices.

What role do biological control and pheromone monitoring play in Tuta management?

Effective Tuta management should not rely solely on chemical insecticides.

In markets where conditions permit, biological control, pheromone technology, and agronomic management practices can be used in conjunction with legally registered chemical products.

Can Bacillus thuringiensis be used for Tuta management?

Certain Bacillus thuringiensis products containing appropriate strains and insecticidal proteins may be used for Tuta management when they are registered and the target larvae are susceptible.

Their actual effectiveness depends on:

• the strain and its insecticidal activity;
• the target larval stage;
• whether the larvae ingest sufficient active ingredient;
• spray coverage;
• storage conditions;
• environmental factors such as UV radiation and rainfall;
• sensitivity of the local population.

Therefore, one cannot assume that all Bt products have the same efficacy against Tuta simply because the product label lists Bacillus thuringiensis.

Biopesticides should also not be described as products that pose absolutely no risk of resistance.

Can pheromone traps replace insecticides?

There is no guarantee that pheromone traps alone can meet all Tuta management needs.

Pheromones can be used for monitoring, partial mass trapping, or mating disruption systems, but their specific functions depend on the pheromone lure, equipment, and application method.

For example, a small number of traps used for monitoring should not be interpreted as evidence that an effective mass trapping program has been established.

In some greenhouses, pheromone technology may be used in conjunction with natural enemies and appropriate chemical control measures.

For importers, the key value of pheromone monitoring also lies in:

helping customers detect pest activity earlier and providing guidance on whether treatment is necessary.

Why Are Agricultural Management Measures Still Important?

Even with effective insecticides, the following should not be overlooked:

• Use pest-free seedlings;
• Remove infested branches, leaves, and fruit;
• Properly manage post-harvest residues;
• Control nearby host weeds;
• Maintaining greenhouse pest control facilities;
• Avoiding the persistent retention of severe pest sources between different crop batches;
• Implementing appropriate crop rotation and field sanitation management based on local conditions.

The purpose of these measures is to reduce the pest’s ability to continue reproducing and re-enter the production system.

They are not merely supplementary marketing claims for insecticides but an integral part of a comprehensive Tuta management program.

How should importers establish a Tuta absoluta insecticide product line?

A well-designed product line should not merely list five or six active ingredients effective against Tuta.

More importantly, it is essential to clarify:

Which customer segment each product primarily serves, what market need it addresses, and whether it truly complements the existing product line.

Scenario 1: Just entering the tomato insecticide market

Importers new to the tomato market should first confirm:

• Is Tuta absoluta widespread in the local area?
• Is the primary cultivation method open-field or greenhouse?
• Which insecticides are local growers already using?
• Is there any known resistance?
• The scale of tomato production and its commercial value;
• The main competing brands and their prices in the current market;
• Whether the target active ingredient can be registered.

Until these issues are clarified, it is not recommended to introduce a large number of Tuta products all at once.

A more reasonable approach is to first evaluate a core product with clear demand, and then decide whether complementary products from different Groups are needed.

Scenario 2: Already Possessing Group 6 and Group 28 Products

Assuming the distributor already has:

• Emamectin Benzoate — Group 6
• Chlorantraniliprole — Group 28

In this case, would it be worthwhile to add Cyantraniliprole or Abamectin?

The answer depends on the business context.

Cyantraniliprole may have a different registered pest spectrum or formulation positioning in certain markets.

Abamectin may also have independent demand in some mite or other pest markets.

However, if the sole purpose is to add new tools for managing Tuta resistance, it is important to recognize that:

• Cyantraniliprole still belongs to Group 28;
• Abamectin still belongs to Group 6.

Therefore, adding these two products does not automatically introduce a new IRAC Group.

In this scenario, distributors should instead assess whether the local market requires other products with different modes of action that remain effective.

Scenario 3: Primarily Serving Professional Greenhouse Tomato Customers

Professional greenhouse customers may place greater emphasis on:

• Integrated management of Tuta and other pests;
• Compatibility with natural enemies;
• Continuous harvesting;
• PHI;
• MRL;
• Product application window;
• Consistent formulation quality;
• Technical support.

If a product effectively controls target pests but severely disrupts a customer’s existing natural enemy system, its long-term commercial value may be limited.

Therefore, in this type of market, the comparison should not be limited to:

“Which product is cheaper per bottle?”

Instead, it should focus on:

Which product is better suited for the entire production and harvesting system.

Tuta Insecticide Product Line Planning Table

Current Market Conditions	Potential Product Directions	Key Procurement Considerations
New Entry into the Tuta Market	A Core Product with Clear Registration Status and Pest Targeting	Actual Demand, Sensitivity, Registration, and Price
Existing Group 28 Products	Evaluate other effective IRAC Groups	Avoid simply adding another Group 28 brand
Existing Group 6 and Group 28 products	Check if specific functions are still missing	Product overlap, resistance, and existing distribution channels
Primarily serves greenhouses	Chemical products coordinated with existing IPM systems	Impact on natural enemies, PHI, MRL
Primarily serves export tomatoes	Registered products that meet target market residue requirements	Export destinations, PHI, MRL
Price-sensitive market	Products with a clear niche and limited volume	Integrated pest management costs under legal usage conditions
Persistent control failures have occurred	First investigate causes and resistance	Do not blindly switch to brands within the same Group

The key purpose of this table is not to dictate how many products each distributor must carry, but to help determine:

Whether there is a genuine justification for a particular product to be included in the local product line.

Why is Tuta absoluta still not being effectively controlled despite the use of insecticides?

Unsatisfactory field control results should not be immediately attributed to product quality issues.

Because of Tuta larvae’s habit of burrowing into leaves and fruit, actual control performance is influenced by multiple factors.

Quick Diagnosis of Common Issues

Field Observations	Possible Factors	Priority Checks
Old galleries are still visible after spraying	Old damage does not recover	Are new galleries appearing?
Live larvae are still present inside the galleries	Larval stage, insufficient exposure, susceptibility	Larval condition and treatment conditions
New borer holes continue to appear in fruit	Existing larvae, ongoing infestation, or a new wave of infestation	Fruit inspection and pest monitoring
Decreased efficacy after repeated applications	Resistance selection pressure	IRAC Group and historical usage
Effectiveness remains poor after switching brands	May still belong to the same Group	Active ingredient and MoA
Traps continue to capture adults	Possible ongoing migration or reproduction	Field occurrence of eggs and larvae
Sudden increase in other greenhouse pests	Disturbance of natural enemies, etc.	IPM compatibility and overall pest records
Variable performance of the same product across different fields	Differences in pest life stage, coverage, management, or localized resistance	Field records versus actual conditions
Fruit has already been severely damaged	The control window may be too late	Economic value of continued treatment

Why can’t old feeding tunnels be used as a basis for assessing efficacy?

Leaf tissue already fed upon by Tuta larvae will not return to its original state following subsequent pesticide application.

Therefore, the presence of brown feeding tunnels after treatment does not necessarily indicate that live larvae are still present.

A more reasonable assessment is:

• Are there still live larvae?;
• Are new feeding tunnels continuing to appear?;
• Is new fruit damage occurring?;
• Is the pest outbreak trend under control?

For recurring pest infestations, follow-up monitoring should be conducted rather than relying solely on the results of a single inspection.

Why might two brands perform differently even if they contain the same active ingredient?

Possible reasons include:

• Formulation quality;
• Storage conditions;
• Batch consistency;
• Application equipment;
• Spray coverage;
• Actual application rate;
• Pest life stage;
• Sensitivity of the local population.

Therefore, different brands do not necessarily indicate different efficacy, and identical labeled concentrations do not imply that all products have exactly the same physical properties.

If product quality is in question, it should be verified through the Certificate of Analysis (COA), product specifications, batch records, and appropriate testing, rather than drawing conclusions based solely on a single field application result.

What should importers check before introducing Tuta products into a new market?

Before determining the active ingredient, importers must first assess whether the product has the legal basis for market entry and long-term operation.

First, confirm the local registration status

At a minimum, the following must be confirmed:

• Target country;
• Whether the active ingredient is approved for use on tomatoes;
• Whether Tuta absoluta is registered;
• Whether use is permitted in open fields or greenhouses;
• Formulation and concentration;
• Application methods;
• PHI;
• Maximum number of applications;
• Other label restrictions.

Pay particular attention to the following:

Just because a pesticide is approved for use on tomatoes in one country does not mean it has received the same registration in another country.

Similarly, approval for open-field use does not automatically imply approval for greenhouse use.

Second, confirm local resistance patterns and the existing product landscape

Before investing in a new product, you should understand:

• Which active ingredients are currently in primary use;
• Which IRAC Groups are used most frequently;
• Whether there are any records of resistance;
• Whether there are persistent control failures;
• Whether multiple similar products are already on the market;
• What specific benefits the new product actually offers.

If a market already has a large number of Group 28 products, registering another Group 28 formulation may be more appropriate for product differentiation rather than as a new resistance rotation strategy.

Third, compare formulation quality and supply capacity

For different dosage forms such as SC, EC, WG/WDG, etc., quality evaluations should be conducted based on the applicable product specifications.Key considerations may include:

• Active ingredient content;
• Relevant impurities;
• Physical stability;
• Dispersion or emulsification properties;
• Storage stability;
• Packaging compatibility;
• Batch consistency.

Specific test items vary depending on the dosage form.

Product quality cannot be evaluated solely based on the concentration of the active ingredient, nor can the testing requirements for one dosage form be directly applied to others.

Fourth, confirm the required technical and registration documents

Depending on the country and procurement stage, the following may be prepared in advance or requested from the supplier:

• COA
• SDS / MSDS
• TDS
• Product Specifications
• Formulation Information
• Technical Source Information
• Stability Data
• Packaging Information
• Batch Information
• Available registration support documents

For long-term registration projects, it is also necessary to confirm whether future commercial batches can maintain the same product source and quality requirements as those in the registration dossier.

Fifth, assess whether commercial costs are reasonable

Purchasing prices may vary significantly depending on the active ingredient and formulation.

However, the assessment should not be limited to:

“How much per liter?”

A more reasonable assessment should also include:

• Local registration application rates;
• Product cost per hectare;
• Actual pest susceptibility;
• Product application window;
• Application equipment;
• PHI and MRL;
• Packaging and logistics;
• Customer affordability;
• Channel competition.

For professional greenhouse and export tomato markets, compliance with residue standards and integration into the overall production system is sometimes more important than simply lowering the purchase price.

Frequently Asked Questions About Tuta absoluta

Are the Tomato Leafminer and Liriomyza the same pest?

No.

Tuta absoluta belongs to the order Lepidoptera; its larvae can mine inside leaves and may also damage young shoots and tomato fruits.

Liriomyza belongs to the order Diptera; its typical damage consists of serpentine mine tunnels in leaves.

Pest control products and resistance management strategies for these two pest groups cannot be directly applied to one another.

Which insecticide is most effective against Tuta absoluta?

There is no single optimal product suitable for all countries and all populations.

Chlorantraniliprole, Emamectin Benzoate, Spinosad, Indoxacarb, and others can serve as candidate options in markets where they are registered.

The final choice should be based on local susceptibility, insect life stage, registration status, greenhouse or field conditions, and the total cost of integrated pest management.

Can Emamectin Benzoate control Tuta absoluta?

In markets where it is registered and the target population remains susceptible, it can serve as an important candidate product within Group 6.

However, just because it performs well in one country does not guarantee the same effectiveness in all regions.

Can Chlorantraniliprole and Cyantraniliprole be used alternately to manage resistance?

The two cannot be considered as rotation between different IRAC Groups.

Both belong to Group 28.

Even if product formulations and some application uses differ, this does not mean their primary modes of action are different.

Can Abamectin and Emamectin Benzoate be rotated across IRAC Groups?

No.

Both belong to IRAC Group 6.

Whether they are suitable for specific pests should be determined by checking local registrations and actual susceptibility on a case-by-case basis.

Can pheromone traps completely replace insecticides?

This cannot be guaranteed.

Pheromone tools can be used for monitoring, mass trapping, or mating disruption, but their effects vary depending on the application method.

In certain production systems, they can reduce unnecessary chemical treatments, but whether they can independently meet pest control requirements depends on actual pest pressure and application conditions.

Why haven’t the leaf galleries disappeared after spraying?

Because damaged leaf tissue does not regenerate.

When assessing efficacy, focus on checking for live larvae, fresh feeding tunnels, and new fruit damage, rather than simply observing whether old feeding tunnels are still present.

Can greenhouse tomatoes use the same insecticides as field-grown tomatoes?

This cannot be assumed outright.

It is necessary to confirm whether a specific product is registered for greenhouse use, as well as its PHI, MRL, application methods, and impact on the existing IPM system.

Even if the active ingredients are the same, the conditions of use may differ between registered products.

How to select the right Tuta product portfolio for the local tomato market?

For importers and distributors, a truly valuable product portfolio should have three characteristics.

First, each product must have a clear role in pest control.

You cannot simply add an SKU just because a new active ingredient has appeared on the market.

Second, the ability to identify duplicates within the same IRAC group.

Different brands and different active ingredients do not necessarily imply different modes of action.

Third, alignment with the local tomato production and distribution system.

Field cultivation, greenhouse cultivation, continuous harvesting, export residue limits, and existing IPM conditions all influence a product’s suitability for local customers.

The following checklist can be used before formally finalizing a product.

Product Line Evaluation Items	Questions to Answer
Target Pests	Has Tuta absoluta been confirmed?
Market Demand	Is there a persistent and manageable pest problem locally?
Cultivation System	Is it primarily open-field or greenhouse?
Current Products	Which active ingredients are customers already using?
IRAC Group	Is there already a high degree of reliance on a single group?
Resistance History	Are there any records of reduced susceptibility locally?
IPM	Are there natural enemies and pheromone management systems in place?
Registration	Are there suitable applications for tomatoes and Tuta?
PHI / MRL	Do they meet harvest and export requirements?
Formulation	Is it suitable for local equipment and distribution channels?
Procurement Costs	Are they aligned with the customer’s actual pest control budget?
Supplier Capability	Can the supplier ensure consistent quality, documentation, and long-term supply?

If these questions are not clearly answered, simply expanding the insecticide product portfolio will not automatically improve market competitiveness.

Evaluate Tuta absoluta insecticide products for tomatoes with SunAgro

Tuta absoluta is a tomato pest that requires long-term monitoring and integrated management.

For importers, the key to selecting an insecticide is not to find a product that performs identically under all conditions, but to build a reasonable product portfolio based on actual local needs.

SunAgro serves pesticide importers, distributors, brand partners, and registration companies, offering insecticide products with various active ingredients, IRAC groups, and formulations. We discuss product specifications, technical data, samples, and long-term supply on a project-by-project basis.

If you are planning to introduce Tuta absoluta insecticide products for the tomato market, please provide us with the following:

• Target country;
• Major tomato-growing regions;
• Field or greenhouse cultivation methods;
• Actual damage caused by Tuta absoluta;
• Insecticides currently sold or in use;
• Existing IRAC Groups;
• Known control failures or resistance issues;
• Whether natural enemies or pheromone monitoring are used;
• Target active ingredients and formulations;
• Local registration status;
• PHI, MRL, or export market requirements;
• Estimated annual demand and target price range.

Based on specific collaborative projects, we can assist in evaluating suitable insecticide strategies, product portfolios, technical documentation, and supply arrangements.

To learn more about SunAgro’s product range, please visit Insecticide Product Categories.

A strong Tuta absoluta product line is not about providing distributors with the largest number of insecticides, but rather ensuring that each product addresses a specific market need and strikes a reasonable balance between resistance management, tomato production, product registration, and long-term commercial value.