In nature, organisms include animals, plants, and microorganisms. Parasitic and predatory insects in animals, such as parasitic wasps, predatory floating worms, etc., can be used to control pests through artificial mobilization or indoor breeding, ie, the term “worm-control pestsâ€, which are used to control pests. Play a role of pesticides; many species of plants contain pest-killing ingredients, such as tobacco contains nicotine, legumes fish rattan contains rotenone, the asteraceae plant pyrethrum flowers contain cyprocin, after industrial extraction, you can As pesticides, namely plant-derived biological pesticides; microorganisms include bacteria, fungi, actinomycetes, viruses, etc., some of them use their own infectivity to kill pests, and some use their metabolites to kill pathogens.
Scientific pesticides should be used scientifically in agricultural production.
1, scientific selection of drugs. There are many varieties of biological pesticides with different characteristics, and the price difference is also great. The scientific selection of pesticides should be based on the purpose of production of agricultural products, the level of reference, and the price of pesticides. For example, the purpose of the production of agricultural products is not divided into self-catering, feed, processing, domestic market sales, export sales, etc.; the product level is divided into general pollution-free products, A-level green food, AA-level green food, to produce For example, for the production of A-grade green foods and the prevention and control of rice bacillemia, three loops, Fuji No. 1 chemical pesticides or biological pesticides such as polyoxygenase (polyoxin) can be used. Such as the production of AA grade green food, soaking seedlings should be modified biological pesticides (coenocin), control of rice blast should be applied to the period of polyoxygenase or kasugamycin and determine the characteristics of pesticides. For most types of biological pesticides, because of their slow insecticidal rates, early stage application of pesticides is generally carried out to facilitate early control and contact-killing of biological pesticides. This requires pests to be applied at a certain amount in the field. The field of pesticide application has no insects and no insecticidal effect. Inducing bactericidal agents such as OS, Shi Wu Ling require early application to induce resistance of crops to pathogens and reduce damage. Another example is that Lubao No. 1 prevents chrysanthemums, so most of the Cuscuta seedlings are required to be applied when stems and stems are wrapped around the crops, and premature application of the Cuscuta seedlings is not effective.
2, uniform application. The majority of biological pesticides are contact inhibitors, and there is very little internal absorption and conduction, so uniform application is required in order to ensure the effect. Under normal circumstances, spray should be constant, as far as possible on both sides of the blade with pesticides. The amount of liquid spray per 667? is suitable for water of 40?50C. Powder application should be carried out as early as possible, when there is dew in the field, in order to increase the amount of powder attached and improve the control effect. Do not spray when the wind speed is high to prevent drift and waste.
3, scientific storage of drugs. The first is to keep it in a cool, dry and ventilated place; the second is to prevent exposure to excessive heat or strong light and prevent decomposition from failing; the third is to use a good liquid that is used up on the same day to prevent hydrolysis from failing; The liquid agent should be stored in a non-frozen low-temperature condition, but it should be used within the fidelity period, otherwise it can not be used again. For living biological agents, we must pay more attention to the conditions and time of drug storage and avoid loss. Live natural enemies must be put into the field within the specified time after purchase, and they cannot be stored under normal conditions. If it must be stored, it should be stored in a refrigerator or cold room at a certain temperature for a short period of time according to the technical conditions required.
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