Costly Mistakes in Applying Anti-Thrips Biopesticide in Horticulture

Thrips (Thysanoptera) are major pests on horticultural crops such as shallots, chilies, and tomatoes. These tiny insects not only damage leaf and fruit tissues but also act as vectors for deadly viruses. The use of anti-thrips horticultural products based on entomopathogens like Beauveria bassiana (thrips strain) is an eco-friendly solution that is gaining popularity. However, many farmers fail to achieve optimal results due to application errors. This article discusses seven fatal mistakes commonly made and how to fix them.

1. Incorrect Application Timing

One of the most common mistakes is spraying entomopathogens during the day under intense sunlight. Beauveria bassiana is a microorganism sensitive to UV light. Direct sunlight exposure can deactivate spores within hours. As a result, thrips control effectiveness drops drastically.

Solution: Application should be done in the late afternoon towards sunset, when relative humidity (RH) is above 75%. These conditions support spore germination and penetration into thrips bodies. The Formula Anti-Thrips Horticulture product from Biosolution is designed for afternoon application at a dose of 3 ml per liter of water. Spraying every 5–7 days is highly recommended to break the thrips life cycle.

2. Insufficient Spray Volume, Uneven Coverage

Thrips often hide in protected plant parts such as growing points, leaf folds, and flower crevices. Farmers often spray with too little volume, failing to reach all plant parts. Yet, entomopathogens must make direct contact with thrips bodies to be effective.

Solution: Ensure sufficient spray volume to wet the entire plant surface, including the underside of leaves and growing points. For onions, chilies, and tomatoes, about 400–600 liters per hectare is needed depending on plant size. Use nozzles that produce fine droplets for more even distribution.

3. Mixing with Incompatible Chemicals

Many farmers are accustomed to mixing various pesticides in one spray tank. However, not all chemicals are compatible with Beauveria bassiana. Fungicides containing copper, sulfur, or chlorine can kill entomopathogen spores. Broad-spectrum chemical insecticides can also inhibit fungal growth.

Solution: Avoid mixing Formula Anti-Thrips Horticulture with fungicidal or bactericidal chemicals. If other pests or diseases need control, apply separately with at least a 48-hour interval. Read product labels and conduct compatibility tests if in doubt.

4. Improper Storage and Handling

Entomopathogens are living organisms requiring special handling. Storing the product in hot places, exposed to direct sunlight, or extreme temperatures can reduce spore viability. Farmers often store biological pesticides in hot warehouses or in cars without cooling.

Solution: Store Formula Anti-Thrips Horticulture in a cool, dry place, ideally at 4–8°C (refrigerator). Do not expose the product to direct sunlight. Use within the specified time after opening. Ensure the water used for spraying does not contain high chlorine; let tap water sit for 24 hours before use.

5. Ignoring Thrips Population and Action Thresholds

Some farmers apply entomopathogens routinely without first monitoring thrips populations. As a result, applications are made when populations are already very high, making control difficult. On the other hand, some delay application because they think entomopathogens are less effective.

Solution: Conduct regular monitoring using yellow traps or direct observation. The action threshold for thrips on chilies is 2–3 adults per leaf, on onions 5–10 nymphs per plant. Start application when populations are still low, i.e., early in the growing season or when first symptoms appear. Preventive application is more effective than curative.

6. Neglecting Environmental Sanitation

Thrips have many alternative host plants such as weeds and crop residues. If the surrounding area is not cleaned, thrips will continue to migrate to cultivated plants. Farmers often focus on spraying but forget to clean weeds and harvest residues.

Solution: Perform field sanitation by removing weeds and alternative host plants. Dispose of plant residues infected with thrips. Use plastic mulch to reduce thrips populations in the soil. Combine with regular application of Formula Anti-Thrips Horticulture.

7. Not Using Correct Dosage and Frequency

Each entomopathogen product has recommended dosage and application frequency. Farmers often reduce dosage to save money or increase it thinking it will be more effective. Both can lead to control failure or resistance.

Solution: Follow product application instructions diligently. For Formula Anti-Thrips Horticulture, the recommended dose is 3 ml per liter of water, sprayed every 5–7 days. Do not reduce or increase dosage without guidance. If thrips populations are high, increase frequency to every 3–4 days, not the dosage.

Conclusion

Controlling thrips on onions, chilies, and tomatoes requires the right strategy. The use of anti-thrips horticultural products based on Beauveria bassiana is highly effective if applied correctly. Avoid the seven mistakes above: wrong application timing, insufficient spray volume, incompatible mixtures, poor storage, lack of monitoring, weak sanitation, and incorrect dosage. By applying proper techniques, farmers can effectively suppress thrips populations, reduce crop damage, and increase yields. For more information about the product and technical consultation, contact the Biosolution team via WhatsApp.

FAQ

1. Is Formula Anti-Thrips Horticulture safe for natural enemies?

Yes, this product is selective and does not harm beneficial insects such as thrips predators and parasitoids. Beauveria bassiana thrips strain only infects thrips and some other target pests.

2. How long after application do thrips start to die?

Beauveria bassiana spores take 2–3 days to germinate and penetrate the thrips cuticle. Thrips death begins to be seen on days 3 to 7 after application, depending on environmental conditions.

3. Can this product be used together with foliar fertilizer?

It is best not to mix directly because foliar fertilizers can alter pH and affect spore viability. Apply foliar fertilizer and entomopathogens separately with at least a 2-day interval.

4. Is it necessary to add a sticker or surfactant?

It is recommended to add a non-ionic surfactant to improve spray spread and adhesion on waxy leaves. Use according to the recommended dosage on the surfactant label.

5. How to know if spores are still alive?

Before application, perform a viability test by sprinkling a small amount of product on agar media or moist filter paper. If white mycelium appears after 24–48 hours, the spores are still active.