Cotton aphid, commonly known as greasy insects, oil and sweat.
Hazard characteristics: The sap is clustered on the leaf back and the tender tip, and the damaged tissue cells are destroyed, causing the cotton leaves to curl to the back, the plants are not short, and the honeydew is secreted, which causes mold growth and affects photosynthesis. It is necessary to timely carry out pesticide control.
Occurrence law: nursery mid-May to mid-June, Fuxi from mid-July to mid-August, breeding 10 to 20 generations per year. In recent years, it has risen to major pests in China's major cotton producing areas, seriously affecting cotton production.
Prevention and control technology 1 prevention and control indicators:
The control index of cotton aphid in the seedling stage: the rate of 3 pieces of true leaf pre-rolled leaves is 5% to 10%, and the control rate of 100 to 100 pieces is 100% to 30%, and the rate of 4 to 8 leaves is 20% to 30%. Control when the amount is 2000~4000. The control index of cotton Fuxi: the rate of coiled leaves in the bud stage is 20% to 30%, and the number of one hundred plants is 10,000. During the flowering and bolling period, the amount of sputum in the upper, middle and lower leaves of the 100 plants was 13,000 heads, and the rate of sporadic oil spots in the middle was more than 3%.
2 chemical control: When the number of cotton aphid reaches the control index, the following pesticides are used to spray evenly and finely. You can use the red scorpion brand produced by Xi'an Dingsheng 30% insecticide acetamiprid 8000 ~ 10000 times liquid spray or sputum 2000 ~ 3000 times liquid spray. If the resistance of Fuxi is relatively large, it is better to use red scorpion 10000 times liquid and bright sword brand 20% weiduo wettable powder 1000-1500 times liquid spray. After the test, the effect is remarkable, and at the same time, various pests such as blind mites and cotton bollworms can be effectively controlled. Cooperating with the cotton multi-foliar fertilizer produced by Xi'an Ruite can promote cotton growth and improve cotton quality and yield.
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