In the current pollution-free cultivation of vegetables, fruits and other crops, microbial pesticides have received more and more attention. In order to improve the use effect of the microorganisms in vivo, it is necessary to pay attention to the use of misunderstandings at the time of application.
Misunderstanding 1: The temperature is 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 ° 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.
Myth 2: Apply in dry weather. If the application is carried out under high temperature and dry weather conditions from 10:00 am to 4:00 pm on sunny days, the farmers report that the effect is not good. This is mainly due to 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.
Misunderstanding 3: Do not avoid the sun. 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.
Myth 4: It was washed away by heavy rain after use. 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.
Misunderstanding 5: Mixed 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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