Cotton leafhopper, also known as cotton spider mite, belongs to Arachnida, Acarina, Aphididae pests and all cotton areas. Besides harming cotton, it also harms corn, sorghum, wheat, and soybeans. The host is extensive. Cotton leafhoppers mainly suck sap on the back of the cotton leaf, causing yellow leaves, red leaves and fallen leaves and other hazards on the leaves, resembling a fire, commonly known as "fire dragon". In the year of the outbreak, it caused a large area of ​​reduced production or even no harvest. It can be harmful throughout the growing period of cotton. First, the characteristics. In the fall and winter seasons of cotton leafhoppers, female adults and other insects overwinter in winter green manure, weeds, earth seams, and litter. They begin in late February and early March, and are first endangered in winter or early spring. After the cotton seedlings are unearthed, they will be moved to the cotton field and harmed. Cotton leafhoppers on weeds are the main source of cotton fields. Every year in mid-June, M. falciparum endangers the peak, and M. glutinosa damages the most. From mid-July to mid-August, Fuxi damages cotton leaves. In late September, late-onset late-onset cotton leafhoppers in cotton fields can also be harmed. Weather is the primary condition affecting the occurrence of cotton leafhoppers. The weather is hot and dry, long-lived and sunny, and the cotton leafhoppers will occur in large areas, causing the leaves to turn red and the leaves to fall. Heavy rain and heavy rain have a certain flushing effect on cotton leafhoppers, which can rapidly reduce the density of insect populations and inhibit and reduce the damage of cotton leafhoppers. Second, prevention and control measures 1, agricultural control. In the early spring, weeds are removed to reduce the source of maggots. Cultivate strong seedlings, increase application of compound fertilizers, and increase the resistance of cotton plants to insects. Found that with buds and leaves, removed in time to bring out the destruction of the field outside to prevent spread and spread. 2, chemical control. When the cotton field has a 3-5% strain, it should be controlled. Found that a strain hit a circle, found a little hit one, can choose to use 800-1000 times dicofol, choose to prevent or treat in the dew dry or early evening, enhance efficacy, increase killing effect, while spraying evenly to the back of the leaf, do There is no diseased plant in Daejeon, and the diseased plant leaves no diseased leaf. In order to prevent the resistance of cotton leafhoppers, it is necessary to use a net of broomsticks, killing cockroaches and other acaricides. Can also promote the use of "avermectin" to control cotton leafhoppers, "avermectin" because it can be positively applied to achieve the opposite effect of dead insects, prevention and control is more simple and easy, and long control period, the effect is stable.
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