The use of pesticides depends not only on the appropriate period of prevention and treatment, but also on the number and severity of diseases and pests. Then, when a pest occurs, how to measure whether it has reached the prevention and treatment standards? This is a relatively complicated problem and should be considered from a variety of factors, such as plant varieties and their tolerance to pests and diseases, types of pesticides, methods of control, control effects and economic benefits. Therefore, to correctly formulate prevention and control standards, we should master several basic principles.
(1) Economically cost-effective. That is to say, the use of smaller control costs can greatly reduce the economic losses caused by pests. If the occurrence of pests and diseases is very light, it is estimated that the economic losses caused by it are not large. If the application of pesticides increases the production cost, it is not worthwhile. It is not necessary to use pesticide control at this time.
(2) Look at the number of pests, that is, the density of insects. For example, cotton bollworm, cotton seedlings with 100-30 eggs per 100 plants should be chemically controlled; as for sorghum, more than 50 eggs per acre should be applied universally, 50 or less should be selected for prevention, or per acre. More than 30 of the dry heart group should be treated with the rule of law, and 30 or less should be selected for prevention and treatment.
(3) Consider the effects of natural enemies and other environments on pests and diseases, and protect and utilize natural enemies. For example, the amount of brown rice blast in rice fields is relatively large, and it should have been applied. However, if there are many natural enemy spiders at this time, the ratio of the number of spider mites to the number of locusts can reach 1:8-9, so it is not necessary to apply the medicine. In short, the standards for disease and insect control should be flexibly controlled in production according to actual conditions.
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In yellow, no printing. Custom color and logo laser printing available too.
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Using a pliers and easy to put the rfid ear tags on the ear.
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