Precautions for the use of bacterial pesticides
The bacterial pesticides currently used are mainly Bacillus thuringiensis insecticides , such as Bt emulsion, 7216, and worm, which have the same insecticidal and insecticidal effects. It is mainly used for cabbage caterpillars, Plutella xylostella, and Spodoptera litura on vegetables; gypsy moth on tree flowers, American white moth, pine caterpillar, etc.; rice aphids on rice, rice leaf roller, two, three螟, etc.; cotton bollworm, leaf curler, cotton worm, tea caterpillar, tea mites, etc. on cotton.
So what are the precautions in the use of bacterial pesticides? The summary of China Pesticide Network is as follows:
Bacterial pesticides are closely related to various environmental factors such as temperature, humidity, sunlight, rain, and wind.
1. The optimum temperature for the use of bacterial pesticides in temperature and sunlight is above 25 °C. When the temperature is low to a certain extent, the insecticidal effect is completely lost. Bacterial pesticides are used at 25 to 30 ° C, and the control efficiency is 1 to 2 times higher than that at 10 to 15 °C. Therefore, it is better not to use bacterial pesticides when the temperature is lower than 20 °C; in order to reduce the damage of ultraviolet rays to bacterial spores in sunlight, it is best to use bacterial pesticides on cloudy days or after 4 pm, such as in powdery bacterial pesticides. Adding raw molasses or corn syrup will have a certain effect on filtering UV rays.
Second, the greater the humidity and the humidity of the rain environment, the better the efficacy of the bacteria and pesticides. Therefore, the use of bacterial pesticides should be carried out in the morning and evening with dew, in order to facilitate the adhesion of the microbial agents to the stems and leaves, and promote spore reproduction, increasing the chance of contact with pests. In addition, the moister soil helps the adsorption of the microbial agent, thereby improving the insecticidal effect; the medium to heavy rain will wash the bacterial pesticide sprayed on the stems and leaves of the plant to reduce the control effect. If it is drizzled 5 hours after spraying, it will increase the effect of prevention. In order to ensure the efficacy of the drug, it should be applied on a cloudy or light rainy day without any moderate or heavy rain within 1 to 2 days after application. If it is heavy rain after application, it should be applied immediately after the rain. At this time, the insecticidal effect is best.
Third, the wind
Bacterial pesticides are wasteful in windy days, especially powders, which are lost more. At the same time, windy days are not conducive to the germination of spores. Therefore, bacterial pesticides should be applied in the absence of wind or breeze.
The " Precautions for the Use of Bacterial Pesticides " is a summary of the pesticide network .
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