In the current vegetables, fruits and other crops cultivated in pollution-free, micro-biological pesticides more and more attention. In order to improve the application effect and control effect of the microorganisms in vivo, it is necessary to guard against misunderstandings during the application, scientific use of drugs, to avoid five.
One should avoid the temperature being too low when applied. Some farmers do not pay attention to environmental factors when applying microbial live pesticides, do not choose to apply under high temperature weather conditions, even in winter and early spring cold weather conditions, so the expected control effect is not achieved. This is because higher temperatures are required for the application of biological pesticides. Tests have shown that between 25 Â°C and 30 Â°C, the effect of microbial live pesticide control after spraying is 1 to 2 times higher than that between 10 Â°C and 15 Â°C.
Second, avoid applying in dry weather. If it is applied under high temperature and dry weather conditions from 10:00 am to 4:00 pm on a sunny day, the effect is not good. This is mainly due to insufficient ambient humidity. Therefore, it is preferable to apply when the humidity is high, such as after a cloudy day, after a rain, or in the morning.
Third, we must avoid strong sunlight. 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 better to apply it after 4 o'clock in the afternoon or on a cloudy day.
Fourth, it is necessary to avoid heavy rain after application. Spores are most afraid of heavy rain, because the 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 its death once it is eaten. Therefore, the application time should be determined according to the weather forecast.
Fifth, avoid mixing with fungicides. 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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