Whiteflies are the primary pests affecting greenhouse-grown cucumbers, tomatoes, peppers, eggplants, and kidney beans. In severely infested fields, yield losses can exceed 30%. When whitefly populations become problematic, it's essential to combine chemical control with specific monitoring thresholds. For example, in tomato crops, treatment should be considered when there are more than 10 whiteflies per leaf, while for cucumbers, the threshold is 50 to 60 whiteflies per leaf. At this point, high-efficiency, low-toxicity pesticides can be applied effectively.
Some recommended options include 2.5% imidacloprid wettable powder diluted at 2500–3000 times, which controls eggs, nymphs, and adult whiteflies. Another option is 2.5% kungfu emulsifiable concentrate diluted 2000–3000 times, and it works better when mixed with a suitable adjuvant. Additionally, 25% thiamethoxam emulsifiable concentrate can be used at 2000–2500 times, or 2500–3000 times dilution of avermectin emulsifiable concentrate. Another effective choice is 2.5% cyfluthrin emulsifiable concentrate, diluted up to 3000 times.
To prevent the development of pesticide resistance, it's important to rotate these products regularly. Spraying should focus on the underside of leaves, where whiteflies tend to congregate. A treatment schedule of once every 5 to 7 days is usually recommended, and in severe cases, 3 to 4 applications may be necessary. With proper timing and application, the control effectiveness can exceed 98%, ensuring healthy crop growth and minimizing economic losses.
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