Common misunderstandings in the use of microbial pesticides

In the current pollution-free cultivation of vegetables, fruits and other crops, microbial pesticides have been paid more and more attention. In order to improve the effect of the use of microorganisms in vivo, we should beware of misunderstandings in its application.

Misunderstanding one

The temperature is too low when applied. When applying microbial pesticides in vivo, some farmers do not pay attention to environmental factors, do not choose higher temperature weather conditions, or even in winter and early spring cold weather conditions, so they do not achieve the desired control effect. This is because higher temperatures are required for the application of biological pesticides. The results showed that the control effect of microbial pesticides sprayed in the range of 25 ℃ ~ 30 ℃ was 1 to 2 times higher than that of 10 ℃ ~ 15 ℃.

Misunderstanding 2.

Apply in dry weather. If applied under high temperature and dry weather conditions such as 10: 00 a.m. to 4: 00 p.m. On a sunny day, the effect was not good. This is mainly due to the lack of environmental humidity. It is best to use it on cloudy days, after rain or in the morning when the humidity is high.

Misunderstanding three

Not out of the sun. Did not avoid the high temperature, strong sunlight at noon, resulting in a decline in efficacy. Microbial pesticides in vivo are most afraid of strong sunlight. Ultraviolet light in the sun has a fatal killing effect on spores, and ultraviolet radiation can also have a deforming and reducing effect on parasporal crystals, so choose to use it after 4 o'clock in the afternoon or on a cloudy day, the effect will be greatly exerted.

Misunderstanding four

It was washed away by heavy rain after use. Spores are most afraid of being washed away by torrential rain, which will wash away the bacteria sprayed. If there is light rain after spraying (5-6 hours later), it will not reduce the efficacy, but can improve the control effect, because the light rain is very beneficial to spore germination, and pests will accelerate their death once eaten. Therefore, the application time should be determined according to the weather forecast.

Misunderstanding 5

Mixed with fungicides. For example, as a fungal insecticide, the efficacy is achieved by the live spore action of the fungus. After application, live spores infect aphids and die, which can be transmitted continuously and cause mass death. However, as a living fungus, if mixed with pesticides, they are killed by fungicides and naturally lose their insecticidal effect.