In recent days, numerous vegetable farmers have reported a severe infestation of whiteflies in their greenhouses. Despite employing various control methods such as fumigation and spraying, the results have been disappointing. After careful analysis, I believe the main reasons for this issue are as follows: First, many farmers lack a proper understanding of whiteflies. These pests belong to the order Hemiptera, specifically the family Aleyrodidae. Both adults and nymphs feed on plant sap, causing yellowish spots and eventually leading to wilting or even plant death. Whiteflies reproduce rapidly, with large populations that secrete honeydew, reducing the quality and market value of vegetables. Their wings are coated with a waxy layer, making it difficult for insecticides to adhere effectively. Additionally, their flying ability is weak during cool mornings but becomes strong when temperatures rise.
Second, the timing of pesticide application is often incorrect. Most farmers tend to apply chemicals when the sun is out and there's no dew on the leaves, which reduces the effectiveness of the treatment. Third, the formulation of pesticides is not always scientific. Some farmers believe that higher-priced products yield better results, while others rely on recommendations from others without considering the actual needs of the crop. In reality, a well-structured and scientifically chosen formula can achieve excellent control even with more affordable products.
To address the whitefly problem, several effective measures can be implemented. First, install fine mesh screens on vents to prevent adult whiteflies from entering the greenhouse. Yellow sticky traps can also be placed inside the shed, taking advantage of the insects' attraction to the color yellow. Second, adjust the timing of pesticide applications to early morning, when whiteflies are less active and more vulnerable. Third, optimize the pesticide formula by using a combination of 5000-fold diluted liquid plus 600-fold diluted net solution, or 5000-fold diluted kill solution combined with 1000-fold general spray for stem and leaf application. Apply these treatments every 5 to 7 days, alternating between different products to prevent resistance development.
To further reduce the sooty mold caused by honeydew secretions, adding a thiophanate-methyl 800-fold solution or carbendazim 600-fold solution during the spraying process can help improve overall crop health and appearance. By adopting these integrated strategies, farmers can significantly reduce whitefly infestations and protect their crops more effectively.
Food Additives
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