Improper use of pesticides not only fails to achieve the control effect, but also is prone to phytotoxicity. Therefore, the use of pesticides should be scientific. The following points should be noted in the following winter greenhouse vegetable pesticide application.

1. It is not advisable to use live water to prepare pesticides:

Because there are many impurities in the living water, it is easy to block the nozzle of the sprayer by using the medicine, and it also destroys the suspension of the liquid to cause precipitation.

Second, it is not advisable to increase the amount of water at will:

Excessive addition of water will reduce the concentration of pesticides. Spraying only a small amount of pesticide on the crop is not enough to kill the pest, and some pesticides may even fail completely. Excessive addition of water can also cause the loss of pesticides and lead to environmental pollution. Therefore, when formulating pesticides, the amount of water added should be strictly controlled according to their concentration range.

Third, it is not advisable to increase the amount of pesticides at will:

Before the pesticide is approved for production and sales, it must undergo a rigorous field efficacy test, and then determine the actual use data such as the amount of drug used, the time of administration, and the number of times of application. Therefore, according to the dosage specified in the instruction manual, the control effect can be achieved, and the increase of the dosage not only increases the input, but also causes the phytotoxicity of the crops, increases the residual amount of pesticides in the agricultural products, and aggravates the environmental pollution.

4. It is not advisable to spray pesticides during the flowering period:

When the crops are flowering, their tissues are young, their resistance to stress is weak, and they are prone to phytotoxicity. Therefore, it is necessary to avoid the flowering period when spraying.

5. It is not advisable to spray pesticides before harvesting:

The period of high-efficiency and highly toxic pesticide residues is about 60 days, and the period of high-efficiency and low-toxicity pesticides is about 15 days. Therefore, it is forbidden to apply medicine before harvesting vegetables to avoid food poisoning.

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