(1) Green leafhopper is also called peach duster, peach leafhopper or leafhopper. Distributed in North China, Northeast China, East China, Sichuan, Shaanxi and other places, south of the Yangtze River is very prosperous. Use adults and larvae to harm leaves, suck juice, make leaves lose green, and even shed leaves early.
Prevention and control methods: after winter, thoroughly remove the fallen leaves and weeds around the plants, burn them centrally or bury them deeply to eliminate overwintering pests; Spraying 40% omethoate EC 1500 ~ 2000 times, or 50% marathon emulsion 2000 times, or 50% parathion 2000 ~ 3000 times, or 90% trichlorfon 1000 ~ 1500 times; Brush a hundred kinds of coating agents. (2) Ulmus pumila is distributed in Xinjiang, Gansu and Ningxia. After the leaves are damaged, dense yellow and white spots appear, and even the green color is completely lost. It can cause premature aging and yield reduction, but it does not cause leaf curling and shrinking, which can be distinguished from cotton leafhopper. Host plants mainly include elm, cotton, hemp, Sophora alopecuroides, licorice, alfalfa and so on. Prevention and control methods:
(1) agricultural control: combine fertilizer accumulation in winter and summer to remove weeds on the edge of fields and ditches; Timely early sowing promotes its early development and maturity, and it is closed at full flowering stage; Proper close planting; Rational fertilization, elimination of rare seedlings, to prevent crazy growth; Flood control and drought relief, intertillage weeding.
② Chemical control: When reaching the control standard, spray 75 ~ 100 kg of the prepared chemical every 667 m2. To control cotton leafhopper, 40% dimethoate EC or 80% dichlorvos EC with 2000 times solution and 50% carbaryl wettable powder 1000 times solution can be used. (3) Cotton leafhopper is distributed in all licorice producing areas, with a large amount of occurrence and serious harm.
Control: 45 kg of 2.5% deltamethrin emulsion 1000, 2,500 and 5,000 times solution was sprayed every 667 m 2. After 14 hour application, the control effects were 99.6%, 97.9% and 95.3% respectively, which could be used in production for 3000 ~ 3000 years. (4) Cicadellidae is widely distributed in China, and abroad in the former Soviet Union (Siberia), Japan, Korea, Malaysia, India, Canada and Europe. There are 39 families 166 species of harmful plants.
Prevention and control methods: A large number of adults can be killed by light trapping in adult stage, and adults are very inactive in the morning, so they can be trapped when the dew is still wet: at the end of September, at the beginning of 10, at the time of crop harvest or around the middle of 10, female adults move to trees to lay eggs, and when young nymphs move to short plants, the population can be concentrated, and 90% of them are available. (5) Cicadellidae is mainly distributed in licorice producing areas in Inner Mongolia, with a small number and little harm.
Control method: 3000-fold solution of 2.5% deltamethrin emulsion was used, and 30 kg was sprayed every 667㎡, and the control effect was good.