First of all, pay attention to improve the adhesive properties of the liquid. Summer rain is more, spray on the open vegetables must increase the adhesion of the liquid to resist erosion by rain. Generally, the adhesion of the emulsifiable oil and oil agent on the plant is strong, while the adhesion of the water agent and the wettable powder is poor. From the perspective of improving drug efficacy, when spraying pesticides such as dimehypo, dimethyltetrachlorophosphoric acid, glyphosate, etc., a small amount of neutral detergent powder can be added as an adhesive to increase the adhesive ability of the drug. In some herbicides, adding appropriate amount of ammonium sulfate can increase the adhesion ability. For example, when dimethyl tetrachlorine is added with 0.5% ammonium sulfate, the absorption time is reduced from 24 hours to 10 minutes.

Second, pay attention to the concentration of the drug solution. The efficacy of most pharmaceuticals is closely related to temperature. When the temperature is high, the efficacy is strong, and when the temperature is low, the efficacy is weak. Therefore, the use concentration of pharmaceuticals in the summer high temperature season should be reduced with the increase of temperature, such as the use of drug concentration in winter when the winter season, it often leads to the occurrence of phytotoxicity. For example, if the use level of auxiliaries is 800 times in winter, it should be reduced to 1000 times in summer. If it is still used at 800 times, it will inhibit the plants too much and affect the growth of vegetables. Should pay special attention to vegetable farmers is to avoid spraying in the afternoon at sunny afternoon, because vegetables are most prone to phytotoxicity under high light and high temperature. General spray should be selected before 9 o'clock in the morning or after 4 o'clock in the afternoon when the temperature is low, we must avoid spraying during the high temperature phase of noon to avoid symptoms of poisoning.

In addition, pay attention to the quality of the spray. When spraying, it is required that the droplets of the liquid medicine be uniformly distributed, the coverage is high, and the amount of the liquid medicine is appropriate, and it is preferable that the surface of the wet target object does not flow. When controlling certain pests and acarids, special parts of the spray must be sprayed. If the locusts and crickets like to harm the back of the leaves of plants, when the prevention and treatment, the back of the leaves must be sprayed in order to receive the ideal control effect.

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