Bacterial pesticides are a type of microbial-based preparation used in biological pesticides. They offer high insecticidal efficiency, are environmentally friendly, safe for humans and animals, and do not lead to pest resistance. These are considered a modern solution for pesticide-free vegetable cultivation. However, the effectiveness of bacterial pesticides is closely related to the number and activity of the bacteria. Weather conditions during application can directly influence the performance of these products, so it's important to pay attention to factors like sunlight, temperature, humidity, and rain.
Sunlight, especially ultraviolet rays, can be harmful to spores. Exposure to direct sunlight for 30 minutes may result in about a 50% mortality rate of spores, and this can rise to up to 80% after an hour. To maximize the effectiveness of these bio-pesticides, it’s best to apply them in the late afternoon or on cloudy days when UV exposure is reduced.
Temperature also plays a key role. At lower temperatures, the active ingredients in bacterial pesticides become less effective, as protein crystals take longer to act. The ideal temperature range for spraying is between 20°C and 30°C. For bacterial-based bio-pesticides, the optimal temperature is 25°C to 30°C, where the effect can be 1 to 2 times stronger compared to applications at 10°C to 15°C.
Humidity is another critical factor. Higher environmental humidity increases the efficacy of bacterial pesticides, especially when using powdered formulations. It’s recommended to apply them in the early morning or late evening when dew is present. This helps the microbial agents adhere better to plant surfaces, promoting spore germination and improving overall effectiveness.
Rainfall can affect the performance of sprayed bacteria. Heavy rain may wash away the bacteria from leaves, reducing their effectiveness. However, if it rains more than 5 hours after application, it may actually enhance the control effect by helping the bacteria spread and settle.
According to tips from China Pesticide Network, the weather has a significant impact on the use of bacterial bio-pesticides. Farmers should always monitor weather conditions carefully to ensure optimal results. By choosing the right time and conditions, they can achieve better outcomes with less effort.
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