There are many types of vegetable pests, but they can be classified into three categories: sucking juice, eating leaves, and drilling. The habits of each type of pest are different. According to the living habits of pests and their harmful habits, as well as the characteristics of the host's growth, targeted spraying should be used to prevent the pesticide from directly contacting the worm body in order to achieve an ideal control effect.
Sucker sucking locusts and some leaf-eating pests are concentrated on the leaves and back of parasitic leaves. They should be sprayed in a “circle-dotted†manner. That is, the sprayer’s sprayer sprays the leaves of the plant first and then buckles. Spray on the tender head, so that all the plants and worms are in contact with the agent and can receive better control effects. 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. Drilling pests 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. The flowering time of cowpea in summer is about 7:30am to 10:30am, after which the petals are all closed. The early-instar larvae of the bean pods are dispersed or concentrated. Spraying should be done before 9:00 am. This will allow the worms to fully access the medicines, or miss opportunities. The leaves of cabbage vegetables are covered with a layer of wax powder. When using biological insecticide Bt to control cabbage caterpillar, 0.1% detergent powder is often added to the liquid to reduce the surface tension and make the liquid evenly distributed on the leaves. Control effect.
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