Misunderstanding of spraying pesticides

The pests and diseases are gradually increasing, the use of pesticides is increasing, and the field work time is getting longer. Many farmers have formed a fixed and incorrect operation method when spraying pesticides . From a scientific point of view, farmers have the following misunderstandings in spraying pesticides :
First, the shortcomings of the "swing" spray in front of the body is that the spray is sprayed in front of the body, and people are prone to pesticide poisoning in the environment where the spray has been sprayed. In addition, when spraying the closed herbicide , it is easy to spray unevenly, and the artificial membrane will break the membrane after the stepping, thereby reducing the control effect. The word "Z" in front of the manual sprayer should be changed to the side "Z". Motorized sprayers and hand sprayers should be sprayed sideways in parallel when spraying the herbicide.
Second, the spray method of the mist spray will make the spray uneven, especially affecting the control effect of the contact insecticide. The mist spray is also easy to cause the loss of liquid medicine, and the waste is more serious when the plant is low. Sprayers with good atomization performance should be used as much as possible, and small holes should be used for even spray.
Third, the direct "target" crop manual sprayer can generally use direct spray, and the motorized sprayer is mist type, direct spray will greatly reduce the work efficiency, can not fully play the characteristics of the motor sprayer atomization and high work efficiency. The correct method for motorized spray operations should be to apply a drift spray downwind 20 cm above the crop.
4. The sprayed liquid is dripped from the blade. According to the scientific determination, if the liquid on the leaf is lost to the ground, the amount of the liquid on the leaf is only 50% of the large amount of sediment, and the drug effect cannot be maximized. A large amount of pesticide waste is caused. Therefore, it should be sprayed evenly during the operation to minimize the spraying residence time, reduce the dripping of the liquid from the leaves, and improve the efficacy.
Usually, the amount of pesticide residues refers to the amount of pesticide residues on food crops. According to the China Pesticide Network , after spraying pesticides on vegetables, after a period of time, most of them are volatilized and lost due to sun exposure (especially ultraviolet rays), high temperature and rain, and plant metabolism will also decompose and disappear, but Traces of pesticides and their derivatives may still remain in the harvested products, known as “residues of pesticides”. If the pesticide residue on the vegetables is high, it exceeds the allowable standard, and the long-term consumption of humans and animals will cause different degrees of harm. Therefore, vegetables sprayed with pesticides should be harvested at intervals to ensure that pesticide residues in vegetables are below the nationally permitted standards. This period of time is often referred to as the safe interval of chemicals. The length of the interval depends on the type of pesticide applied, the number of times the drug is administered, the method of application, and the type and climatic conditions of the vegetables. If 40% of the fruit is sprayed with vegetables, the safety interval between spring and summer is generally not less than 6 days, and in autumn and winter it should not be less than 8 days.

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