Low-toxic pesticides can not be multi-spray

At present, many farmers use pesticides instead of dose cups, but they follow their feelings. Even if they do not understand the safety of pesticides, they believe that low-toxicity, low-residue pesticides can be sprayed as many times as possible. There are blindnesses in actual operations, and when and how drugs are used. It is unclear how long the pesticide safety interval is.

Pesticide spraying should be measured according to the recommendations on the label before use at safety intervals. For example, the control of Botrytis cinerea can be sprayed only once or twice at flowering stage. Pesticides can be selected from low-toxic and low-residue acetaminophen, Shijiale, and Nongliling. The safety interval takes 14 days; the citrus spider mites are controlled every time. The season is also endangered at most 2 times, and it takes 14 days from the harvest period. For the control of vegetable diamondback moths, the use of Frigop has a safety interval of only 3 days.

In addition, many farmers believe that biological pesticides are safe, but they are not. For example, the biological pesticide avermectin (insecticide) is used to control spider mites on cotton, and is used twice a season at most. The last application takes 21 days from the harvest. Http://Content/dca50138-ce38-49c8-8ed2-0067003c5cd5?cType=2

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