Microbial pesticides are rapidly advancing within the biopesticide industry, and their use in crop cultivation is gaining increasing attention. To maximize the effectiveness of these living organisms, the China Pesticide Network highlights common misconceptions that farmers should be aware of when applying microbial pesticides:
Myth 1: Applying in low temperatures. Some farmers overlook environmental conditions when using microbial live pesticides, applying them during cold weather, such as in winter or early spring, which can reduce their efficacy. This is because most biological pesticides require higher temperatures for optimal performance. Studies show that the control effect of microbial pesticides is 1 to 2 times greater at 25°C–30°C compared to 10°C–15°C.
Myth 2: Applying in dry weather. Farmers often apply microbial pesticides on sunny days between 10 a.m. and 4 p.m., but this leads to poor results due to low humidity. For example, *Beauveria bassiana*, a fungal insecticide, relies on spores that germinate inside the pest after contact or ingestion. High humidity is crucial for spore germination and infection. It's best to apply these products after cloudy days, following rain, or in the early morning when moisture levels are higher.
Myth 3: Mixing with fungicides. Some fungal-based microbial pesticides, like *Ophiocordyceps sinensis*, rely on live spores to infect pests. However, mixing them with fungicides can kill the beneficial fungi, rendering the product ineffective. Always avoid combining microbial pesticides with chemical fungicides unless specified by the manufacturer.
Myth 4: Heavy rain washing away the pesticide. While heavy rain can wash away spores, light rain after application (within 5–6 hours) can actually improve effectiveness. Light rain helps spores germinate faster, accelerating pest death once they are ingested. Therefore, it’s wise to check the weather forecast before application.
Myth 5: Applying in full sunlight. Strong sunlight, especially around noon, can damage spores due to UV radiation. This can cause deformation or destruction of parasporal crystals, reducing effectiveness. It's better to apply microbial pesticides in the late afternoon or on overcast days to protect the active ingredients.
The China Pesticide Network advises farmers to understand these myths and follow proper application techniques to ensure the best results from microbial pesticides. With careful management, these eco-friendly alternatives can play a vital role in sustainable agriculture.
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