Misuse of microbial pesticides causes farmers to suffer losses

Microbial pesticides for crops with very good results, but the degree of attention microbial pesticides have become more sophisticated in the use must pay attention to administration errors, delayed effects of microbes living body.
First, the dry weather is not suitable for the role of microbial pesticides. If the application is carried out under high temperature and dry weather conditions from 10 o'clock in the morning to 4 o'clock in the afternoon, the farmers' effect is very poor. This is caused by insufficient ambient humidity. Such as Beauveria bassiana, as a fungal insecticide, the preparation mainly contains white zonabulum spores. After application, it is directly contacted with the worm body, or is eaten into the digestive tract by pests on the use, and the spores germinate under suitable conditions in the worm body. Breeding, producing beauverin, etc., causing the pest to die slowly. The hyphae and conidia on the dead worms are transmitted to other healthy worms by contact or by means of airflow, causing epidemics, causing a large number of individual deaths. Beauveria bassiana falling into the soil can also survive the winter in the soil, and then invade the insect body in the second year, continuing the insecticidal effect, and the aftereffect is obvious. Therefore, it is preferable to apply when the humidity is high, such as after a cloudy day, after a rain, or in the morning.

Second, the application of microbial pesticides when the temperature is too low is the wrong method of application. Many farmers' friends did not understand the impact of environmental factors on the application of the drug, and did not pick the weather in the high temperature, but chose to apply in the cold weather conditions in winter and early spring, so the expected control effect was not achieved. This is because higher temperatures are required for the application of biological pesticides. Tests have shown that between 25 ° C and 30 ° C, the effect of microbial live pesticide control after spraying is 1 to 2 times higher than that between 10 ° C and 15 ° C.
Third, the use of strong sunlight is also one of the wrong methods. There is no noon application that avoids high temperature and strong sunlight, causing a decrease in efficacy. Microbial live pesticides are most afraid of strong sunlight. The ultraviolet rays in the sun have a lethal killing effect on the spores, and the ultraviolet radiation can also cause deformation and effect on the parasporal crystals. Therefore, it is necessary to use it after 4 o'clock in the afternoon or on a cloudy day, and the effect will be greatly exerted.
Fourth, do not apply microbial pesticides before heavy rain. After rushing through heavy rain, the efficacy will be reduced. Spores are most afraid of heavy rain, because the rain will wash away the sprayed bacteria. According to the pesticide network , if it is light rain after spraying (5 to 6 hours later), it will not reduce the efficacy, but it will improve the control effect, because the light rain is very beneficial to spore germination, and the pest will accelerate after eating. death. Therefore, the application time should be determined according to the weather forecast.
Fifth, the mixing of microbial pesticides and fungicides is also incorrect. For example, the genus Aspergillus, as a fungal insecticide , is achieved by the action of live spores of O. sinensis. After application, live spores infect aphids and cause death, which can cause continuous infection and cause a large number of deaths. However, as a living fungus, if mixed with an insecticide, they are killed by a bactericide, and naturally lose their insecticidal action.

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