There are many types of vegetable pests, but they can be classified into three categories: sucking juice, eating leaves, and drilling. The living habits of each type of pest are different. According to the living habits and harmful habits of the pests and the characteristics of the host's growth, the pesticide should be controlled and sprayed so that the medicament can directly contact the parasite to achieve the desired control effect.
Sucker sucking locusts and some leaf-eating pests are mostly concentrated on the host's back and shoots. They should be sprayed in a “circle-dotted†manner. That is, the sprayer's sprayer sprays the plant leaves first and then buckles. Spray on the tender head, so that all the plants and insects can be contacted with medicaments to achieve better control effect. The older larvae of Spodoptera litura and Spodoptera exigua have hiding phenomenon during the day. Therefore, it is advisable to control these pests during the growing season by spraying them in the evening. Controlling drill-boring pests, such as rapeseed meal, must be sprayed at the peak of egg hatching.
The host's growth characteristics are different, and the spraying time and method are also particular. In summer, cowpeas bloom at 7:30am to 10:30am. After this time, their petals are all closed. The early larvae of cowpea pods are mostly concentrated on the buds, petals or temporal lobes, and on the receptacles. The spray is used to advance at 9am. The behavior is appropriate, so that the worm body can be more fully exposed to the agent. When cabbage leaves are covered with a layer of wax powder, and biological insecticide Bt is used to control cabbage caterpillar, a 0.1% detergent solution should be added to the liquid to reduce the surface tension and evenly distribute the liquid on the leaves. Improve control efficiency.
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