Microbial pesticides are receiving more and more attention in the pollution-free production of crops such as vegetables and fruits. In order to effectively improve the control effect of microbial pesticides, the following points should be guarded during use.
First: Use under low temperature conditions. The use of biological pesticides generally requires a higher ambient temperature. Some farmers use the microbial live pesticides, ignore the influence of environmental factors, do not pay attention to the use of high temperature weather conditions, even in winter and early spring cold weather conditions, the control effect is not good. Tests have shown that in the environment of 25 ° C - 30 ° C, the control effect after spraying is 1 to 2 times higher than that in the environment of 10 ° C - 15 ° C.
Second: Use in dry weather conditions. Beauveria bassiana in fungal insecticides, the preparation mainly contains white zona vaginal spores. After use, it is directly contacted with the worms, or eaten into the digestive tract by pests. The spores germinate under suitable conditions and propagate in the worms. , producing beauverin, etc., causing the pest to die slowly. If microbial pesticides are used under high temperature and dry conditions from 10:00 am to 4:00 pm on sunny days, the effect will be poor, mainly due to low humidity. Therefore, you should choose to use it when the air humidity is high, such as after cloudy, rain or morning.
Third: After being used, it was washed away by heavy rain. Microbial spores are most likely to be washed away by heavy rain, because heavy rain will wash away the sprayed bacteria. If it is light rain after spraying (5-6 hours later), it will not reduce the effect of the drug, but it will improve the control effect, because the light rain is very beneficial to the spore germination, and the pest will accelerate the death once it is eaten. Therefore, be sure to listen to the weather forecast before using microbial pesticides.
Fourth: mixed with fungicides. For example, the genus Aspergillus, as a fungal insecticide, is achieved by the action of live spores of O. sinensis. The live spores infect the aphids and cause death, which can cause continuous infection and cause a large number of deaths. However, as a living fungus, if mixed with a bactericide, they are killed by the bactericide and lose the insecticidal effect.
Huaxian County Plant Protection Station
First: Use under low temperature conditions. The use of biological pesticides generally requires a higher ambient temperature. Some farmers use the microbial live pesticides, ignore the influence of environmental factors, do not pay attention to the use of high temperature weather conditions, even in winter and early spring cold weather conditions, the control effect is not good. Tests have shown that in the environment of 25 ° C - 30 ° C, the control effect after spraying is 1 to 2 times higher than that in the environment of 10 ° C - 15 ° C.
Second: Use in dry weather conditions. Beauveria bassiana in fungal insecticides, the preparation mainly contains white zona vaginal spores. After use, it is directly contacted with the worms, or eaten into the digestive tract by pests. The spores germinate under suitable conditions and propagate in the worms. , producing beauverin, etc., causing the pest to die slowly. If microbial pesticides are used under high temperature and dry conditions from 10:00 am to 4:00 pm on sunny days, the effect will be poor, mainly due to low humidity. Therefore, you should choose to use it when the air humidity is high, such as after cloudy, rain or morning.
Third: After being used, it was washed away by heavy rain. Microbial spores are most likely to be washed away by heavy rain, because heavy rain will wash away the sprayed bacteria. If it is light rain after spraying (5-6 hours later), it will not reduce the effect of the drug, but it will improve the control effect, because the light rain is very beneficial to the spore germination, and the pest will accelerate the death once it is eaten. Therefore, be sure to listen to the weather forecast before using microbial pesticides.
Fourth: mixed with fungicides. For example, the genus Aspergillus, as a fungal insecticide, is achieved by the action of live spores of O. sinensis. The live spores infect the aphids and cause death, which can cause continuous infection and cause a large number of deaths. However, as a living fungus, if mixed with a bactericide, they are killed by the bactericide and lose the insecticidal effect.
Huaxian County Plant Protection Station
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