With the introduction of the concept of healthy ecological agriculture, many farmers began to choose microbial pesticides when they used drugs, but in the process of operation, they were not used correctly, resulting in failure of microbial pesticides or crop damage. So how do you use microbial pesticides correctly? What are the key points of attention during use?
First, use the principle of grasp
The efficacy of microbial pesticides is related to the quantity and activity of microorganisms. The weather conditions during use will directly affect the microbial activity in microbial pesticides, thus affecting the effect. Therefore, special attention should be paid to meteorological conditions such as temperature, humidity, sunlight and rain.
Second, the temperature
The activity of the microbial pesticide is directly related to the temperature, and the suitable temperature for application should be 20-30 °C. Some vegetable farmers do not pay attention to environmental factors when using microbial pesticides, but choose to use them in low temperature weather conditions, even in winter and early spring cold weather conditions, so they do not achieve the expected control effect.
Note: Below the appropriate temperature, the bio-pesticides sprayed in the pests are slow to breed and difficult to function, resulting in poor product efficacy. The control effect of microbial pesticides at 20-30 °C is 1-2 times higher than that at 10-15 °C. Therefore, when applying the medicine, it is necessary to select a suitable temperature for use.
Third, humidity
The activity of microbial pesticides is closely related to humidity. Generally, the greater the environmental humidity, the more obvious the effect, especially the powdery microbial pesticides. For example, Beauveria bassiana, as a fungal insecticide, contains mainly white-skinned spores and is not easy to survive in a dry environment. Beauveria bassiana is directly contacted with the worm, or eaten into the digestive tract by the pests, and spores are germinated above 60% relative humidity to play the insecticidal effect.
Note: It is best to choose the application when the sun is dry, after the rain or in the morning and evening when the dew is not dry, so as to facilitate the adhesion of the microbial agent to the base leaf, and promote the rapid propagation of microorganisms, improve the efficacy and play a better control effect. . Avoid application in high temperature and dry weather conditions from 10 am to 4 pm on a sunny day.
Fourth, avoid rain
In case of light rain, it is beneficial to the reproduction of active tissues in microbial pesticides, and will not affect the efficacy. However, heavy rain will wash away the liquid sprayed on the crops, reducing the efficacy and affecting the control effect.
Note: According to the local weather forecast, avoid heavy rain and heavy rain, and apply the medicine at the right time.
Five, light
Microbial live pesticides are most afraid of strong sunlight. The ultraviolet rays in the sunlight have a lethal killing effect on microbial pesticides. When the sunlight is directly exposed for 30 to 60 minutes, the microbial mortality can reach more than 50%, and the ultraviolet radiation can also cause deformation and effect on the parasporal crystals.
Note: To avoid high temperature, strong sunlight at noon, it is best to use after 4 o'clock in the afternoon or on cloudy days.
Six, can not be mixed with fungicides
As a living microorganism, if it is mixed with a bactericide, it will be killed by the bactericide, lose the insecticidal and bactericidal effects, and lose its efficacy.
Tips: Many microbial pesticides have strong specificity and generally only work on one kind of pests. For example, Plutella xylostella granule virus can only be used to control Plutella xylostella.
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