The leafhopper that damages cotton is generally called cotton spider mite, and its species are more. The leaves of cotton leafhoppers, if they are sucked on the back of cotton leaves, change their color, and there are few leafhoppers, the leaves will have "yellow spots". When there are more, there will be "red sand" spots. When the damage is severe, the leaves will scorch and finally fall off. When the seedlings are seriously damaged, they cause dead seedlings; when they are injured in the bolls, they increase the shedding of bells, reduce the boll weight, and reduce the yield.
Cotton leafhoppers occur 12 to 15 generations in the cotton area of ​​the Yellow River Basin in one year, 15 to 18 generations in the cotton area of ​​the Yangtze River Basin, and more than 20 generations in the South China Cotton Area. A peak occurs in the northeast and northwestern cotton areas; two peaks occur in the cotton areas of the Yellow River Basin; 3 to 5 peaks occur in the cotton areas of the Yangtze River Valley. When a large amount of cotton plants occur, cotton leafhoppers often spread into the ground to spread.
“The rapid occurrence of hot and rainy days, and the red wind of cotton leaves from Nanyang†is a summary of climate impacts on cotton leafhoppers; the worse the growth of cotton, the more serious the damage is, and the types of eggplant, sesame seeds, beans, melons, etc., around the cotton fields, Ye Hao occurs early and heavy. The higher the terrain, the more dry the plots are, and the more favorable the occurrence of leafhoppers is.
Control methods: (1) Implement the five-character guideline for the prevention and control of farmland fields, namely, "check, insert, pick, wipe, and fight." Check: Check the victim; Insert: Find the victim plant with a mark; Pick: Remove the leaves of the lower part of the cotton plant, and bring out the cotton field to destroy; Wipe: Wipe the back of the cotton plant, the back of the upper leaf; Prevention. (2) To investigate the public opinion in a timely manner, carry out early prevention and control, and control its spread.
Pharmacy and use: Spray the following agents in the period of leaf carp damage: 1.8% avermectin EC 3,000-4000 times, or 2.0% avermectin microcapsule suspension 4000-6000 times, or 4% ivermectin Emulsion 8000 to 10000 times, or 1.8% Avi. Pyridoxine 1500-2000 times, or 6% Avid-chloride 2000-3000 times.
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