With the development of vegetable planting, the types of pests and diseases have gradually increased, and farmers have abused and abused pesticides in production. In order to help farmers scientifically use pesticides, the principles and methods for the use of pesticides for pollution-free vegetables are described below:
First, the principle of use
(1) Strictly abide by the scope and amount of pesticides used. The use of pesticides should be in accordance with the instructions on the package, grasp the scope of use, the control of the object, the amount of medication, the number of medications, not blindly increase the use of concentration.
(2) Explain the safety interval of pesticides. The safe use guidelines for pesticides stipulate the safety intervals for each pesticide, and must be strictly observed when using drugs.
(3) According to the use of standards or guidelines medication. In the use of pesticides must be in accordance with the "Pesticide Safety Use Regulations", "Pesticide reasonable use guidelines" and other regulations promulgated by the state, is strictly prohibited, methamidophos, monocrotophos, carbofuran, omethoate and other highly toxic, highly toxic, high The use of residual pesticides on vegetables cannot be arbitrarily expanded and the method of use can be changed.
Second, use method
(1) Ensure symptomatic application of the drug. There are many kinds of vegetable pests and diseases, and there are also differences in the damage symptoms in different places. The resistance to diseases and insect pests in different environments is different. It is necessary to select suitable pesticides for control according to the specific pests and species in order to receive good control effects.
(2) Grasp the appropriate period of medication. The use of drugs at critical times not only improves efficacy, but also reduces the number of medications and reduces pesticide residues. Plant pests and diseases should be based on prevention and control.
(3) pay attention to rotation medication. If a pesticide is used for a long time, pests and diseases will produce drug resistance, resulting in decreased control efficiency. In order to improve the control effect of pesticides, and not to overuse pesticides to contaminate vegetable products or to produce pest resistance, several pesticides should be used interchangeably.
(4) Rationally mix pesticides. The rational use of pesticides has the advantages of preventing and controlling various pests and diseases, improving control efficiency, and saving labor. However, if the pesticides are improperly mixed, it will not only fail to achieve a mixed effect, but also cause crop injury. In general, 2 to 3 kinds of chemicals are suitable when using pesticides.
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