Microbial pesticides are experiencing rapid development within the biopesticide industry. As more attention is being paid to sustainable crop cultivation, these biological alternatives are gaining popularity. To maximize their effectiveness, the China Pesticide Network highlights common misconceptions that farmers should be aware of when using microbial live pesticides:
**Misconception 1: Applying in low temperatures**
Some farmers neglect environmental conditions when applying microbial pesticides, often choosing to spray during cold weather, such as winter or early spring. This can lead to poor results because microbial pesticides require higher temperatures for optimal performance. Studies show that at temperatures between 25°C and 30°C, the efficacy of microbial pesticides is up to two times greater than when applied between 10°C and 15°C.
**Misconception 2: Applying in dry and sunny weather**
Spraying during hot, dry periods—such as from 10 a.m. to 4 p.m. on sunny days—can reduce the effectiveness of microbial pesticides. For example, *Beauveria bassiana*, a fungal insecticide, relies on high humidity for spore germination and infection. It works best when applied after cloudy days, following rain, or in the early morning when moisture levels are higher. This allows the spores to survive and infect pests effectively.
**Misconception 3: Mixing with fungicides**
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 them ineffective. It’s important to avoid combining microbial pesticides with chemical fungicides unless specifically recommended.
**Misconception 4: Heavy rain washing away the product**
While heavy rain can wash away spores, light rain shortly after application (within 5–6 hours) may actually improve results. Light rain helps spores germinate faster, which accelerates pest death once they are ingested. Farmers should check the weather forecast before applying to avoid unnecessary losses.
**Misconception 5: Not avoiding direct sunlight**
Strong sunlight, especially ultraviolet rays, can damage microbial spores and reduce their effectiveness. It’s best to apply microbial pesticides in the late afternoon or on overcast days to protect the active ingredients from UV degradation.
The China Pesticide Network reminds users to be mindful of these common mistakes to ensure the best possible performance of microbial pesticides. With proper application techniques, these eco-friendly solutions can play a key role in sustainable agriculture.
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