Spraying biological pesticides will not cause residues of agricultural products and will not pollute the environment. It is an effective measure to implement agricultural harmless treatment and improve the quality of agricultural products. Moreover, through the proliferation and spread of natural enemy microorganisms, the formation of pest "plague" can greatly improve the control effect. However, relatively speaking, the technical requirements for the use of biological pesticides are relatively high. If the use is unlawful, the control effect will be greatly reduced. Therefore, it is imperative to popularize bio-pesticide knowledge and improve the use of technology. The key technologies are now introduced as follows:
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Symptomatic medication. "There is no panacea in the world", bio-pesticide is no exception. For example, spraying Bt (Bacillus thuringiensis) pesticides can control lepidopteran pests such as Plutella xylostella, Pieris rapae, Beet armyworm, Spodoptera litura, but on mites and leaves. Pests that suck the plant juice, such as cockroaches, do not work. If avermectin pesticide is used, the control effect on aphids is very good. Therefore, it is necessary to first understand the target of prevention and treatment, and to achieve symptomatic medication.
Grab the key period. Pests have multiple developmental stages in their lifetime. For example, beet armyworm, which often breaks out in summer and autumn, has to go through four stages of development: egg-larvae-蛹-adult. Eggs are protected by egg shells, and they are shielded by clam shells. Adults have wings that can fly and escape. The spraying effect is not great, but the larvae's resistance is weak, which is the best period of prevention and treatment. The same larvae are divided into younger age and old age. Older larvae have developed stratum corneum and thicker wax protection. They are called “rubber worms†by farmers, and drugs are difficult to penetrate into worms, but young larvae have not yet developed. The stratum corneum and waxy, and concentrated together for feeding, spraying is very effective. Grasping this weak link to spray bio-pesticide can achieve twice the result with half the effort.
Look at the weather medication. Biological pesticides made from natural enemy microorganisms such as Bt, Beauveria bassiana, Metarhizium, etc., are closely related to the insecticidal efficacy and the number and vitality of the bacteria contained in the drug. The weather in the outside world is suitable, and the natural enemies have a fast proliferation and strong vitality, so the insecticidal effect is good. Therefore, it is very important to see the weather medication. For example, Bacillus thuringiensis in Bt pesticides has an optimum growth temperature of 20-25 degrees, a suitable humidity of 85% or more, and no strong light irradiation. Therefore, spray in summer and autumn, should choose to spray after 5 pm on cloudy or sunny days. For example, spraying at noon, the sun is strong, the temperature is high, the air is dry, which is unfavorable for microbial activity, and the strong ultraviolet rays will kill the bacteria in a large amount and weaken the control effect. If powder is used, it should be sprayed in the morning and evening when there is dew.
Properly ahead. After the spraying of biological pesticides, it takes a certain period of time to kill the pests. For example, if you use natural enemies, you need to wait for the virus to take away the nutrients in the pests, destroy the cell tissues and then kill them. This process usually takes 3-5 days. The use of acaricidal bacteria and worms to control the insects requires the natural enemy microorganisms to enter the midgut of the pests. The spores, which are then germinated by spores, penetrate the intestinal wall, enter the blood cavity, secrete toxins, form sepsis, and eventually kill the pests. This process takes 2-3 days, and slow takes 4-5 days. Therefore, the spraying time should be appropriately advanced. In the production operation, we must pay close attention to the prediction of pests and diseases, combined with field investigations, and correctly grasp the appropriate period of spraying.
In addition, the concentration of the drug should be strictly controlled, and the spraying should be even and thoughtful. If you want to use it together with other pesticides and agricultural fertilizers, you should use it properly and use it with you.