Pesticide fungicides are getting worse and worse.

Recently, many friends have responded to Xiaobian’s reaction to the fungicide they bought, and they can’t kill the pests. What should I do? This shows that the resistance of the pests is enhanced. To kill the pests, the efficacy of the fungicide must be improved. Just follow the Xiaobian to understand it.

Method for improving the efficacy of fungicides

Selecting the time of spraying and spraying the bactericide too late or too early will affect the control effect. The drug should be administered in time according to the occurrence law and specific conditions of different diseases of crops. It is usually used before the onset (protective use) or at the onset of the disease (precaution).

Mastering the frequency of spraying The frequency of spraying of the fungicide is mainly determined according to the length of the drug's effective period and meteorological conditions. Usually spray every 10 to 15 days, a total of 2 to 3 times. In case of special circumstances, such as rain after application, it should be replenished in time.

It is necessary to increase the quality of the drug to be used. Too much drug will increase the cost and cause phytotoxicity. However, if the drug is too small, the drug can not be used. The quality of the medication should be exquisite, and the spray should be evenly sprayed, so as to ensure that it does not leak.

Method for controlling phytotoxicity of bactericide

There are many reasons for strictly preventing the phytotoxicity caused by bactericidal fungicides. Firstly, the agents with strong water solubility are prone to phytotoxicity. Secondly, different crops have different sensitivities to the medicinal agents. For example, Bordeaux mixture generally does not cause phytotoxicity, but Copper-sensitive crops can also cause phytotoxicity.

Beans, potatoes, and cotton are sensitive to stone sulphur. Furthermore, the different growth and development stages of the crops have different responses to the chemicals, and the seedlings and the flowering stages of the booting are prone to phytotoxicity. In addition, the general use of high temperature and drought, strong sunshine or fog, high humidity and other conditions can easily cause crop phytotoxicity.

Attention to evading drug resistance The use of fungicides also has the problem of resistance to crop diseases. In order to avoid disease resistance, it is necessary to do a good job of alternating (rotary) use of different types of pesticides on the basis of scientific selection of pesticides . It is strictly forbidden to use one pesticide for a long time.

Cautious drug mixed bactericides are mostly alkaline pesticides, so they cannot be mixed with insecticides that are easily decomposed and decomposed by alkaline substances, such as Bordeaux mixture and stone sulphur mixture. Some fungicides, such as carbendazim, cannot be mixed with boricides such as Bordeaux mixture, stone sulphur mixture, and thiophanate, which also cause the insecticidal (bacteria) microorganisms to lose their physiological activity and insecticidal (bacteria) ability.

More pesticide knowledge, please pay attention to China Pesticide Network

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