The temperature in the early spring is relatively low. During the process of crop disease prevention and control, it is necessary to apply the pesticide scientifically. Otherwise, it is very easy to cause poor control and heavy pollution.
First, choose pesticides to be accurate. Some pesticides are greatly affected by temperature, and as the temperature decreases, the efficacy declines significantly. However, some pesticides are less affected by temperature and can exert normal insecticidal effects. Therefore, pesticides that are less affected by temperature differences should be selected in the early spring, such as mineral oil emulsions, pine resin mixtures, and lime sulfur.
Second, choose the sunny high temperature application, the temperature rises, the pest activity increases, the food intake increases, so when the sunny high temperature application will help to improve the pesticide control effect.
Third, choose the right method of application. To prevent and treat crop diseases and insect pests in greenhouses, smoke and dust should be applied as much as possible. When applying spraying method in greenhouses, firstly pay attention to the room temperature in the shed, and prevent the temperature from being too high to cause injury or death of the pesticide application, and at the same time, reduce the frequency and dosage of the pesticide.
Fourth, ensure the safety interval. In early spring, the degradation rate of pesticides is slow, and pesticides have a long time in the plants. For food safety, the harvest time is appropriately extended on the basis of ensuring safety intervals.
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