The leafhoppers that cause damage to cotton in China are Tetranychus cinnabarinus and two-leaf worms. Urticae, truncate T. truncatus, Turk Turkestani and Dunhuang Ye T. Dunhuangensis and Shenze leafhopper T. Kanzawai and other 6 species. Color version 142.1133 scientific name Tetranychus cinnabarinus (Boisduval) 蜱螨目, å¶èž¨ç§‘. Alias ​​leafhopper, cotton red spider. Distribution in Beijing, Shandong, Hebei, Inner Mongolia, Gansu, Shaanxi, Henan, Jiangsu, Taiwan, Guangdong, Guangxi and other provinces.
Host cotton, corn, sorghum, millet, sunflower, mulberry, sweet potato, beans, melons, eggplant and so on.
The characteristics of damage and if the raft gathers on the back of the cotton leaf to attract the cotton leaf sap, the yellow leaf and white spot appear on the front of the cotton leaf. Then the red spot appears on the leaf surface. The damage is serious, the red area expands, and the cotton leaves and the cotton boll are dry and fall off. Like fire. Cinnamomum vulgaris is a dominant species, often mixed with other leafy scions, and mixed.
Morphological characteristics Female adult carcass carcass length 0.48-0.55mm, width 0.32mm, oval, body color often varies with the host, mostly rust red to dark red, body back on both sides of a pair of dark spots, skin streaked triangle To semicircular. Male worms are 0.35mm long and 0.2mm wide, with a rounded front end and a slightly pointed abdomen. Their body color is lighter than that of a female. Oval, approximately 0.13 mm in diameter, pale yellow, reddish before hatching. The young worm 3 pairs of feet. If you have 4 pairs of feet, it is similar to Chengyu.
Life habits North China Cotton District 10-15 generations old, 20 years old to the south, the overwintering states and places vary from region to region, in north China females form a cochlea in weeds, litter and earth seams in the winter; in Central China The species is overwintering in weeds and bark seams; female adults in weeds or peas, broad beans and other crops in winter. When the temperature in Hunchun is above 10°C, it begins to multiply. In March-April, we took feeding on weeds or other hosts. Shandong and Henan moved into cotton fields in mid-May. In addition to damage caused by cotton, wheat, and cotton beans, the cotton fields suffered less damage until June. From early to mid-August, it entered the cotton field. After mating into feathers, they mated and spawned on the second day. Each female was able to produce 50 to 110 capsules, prolific in the leaves. The egg period 2 is 13 days. The development period of the young worm and Ruoqiang is 5 to 11 days, and the survival period of the pupa is 19-29 days. Can be parthenogenetic, mostly male offspring. The young worm and the early raccoon are not active. In the later period, Ruoqiang was lively and bulimia, and had the habit of climbing upwards. First damage the lower leaves and then spread upward. When there are too many breeding numbers, they often cluster at the tip of the leaf, rolling down the ground, being blown away by the wind and crawling around. The starting temperature for the development of C. cinnabarinus is 7.7-8.8°C, the optimum temperature is 25-30°C, and the optimum relative humidity is 35-55%. Therefore, the high-temperature and low-humidity of June-July will be aggravated, especially in dry years. Great happening. However, if the temperature exceeds 30°C and the relative humidity exceeds 70%, it is unfavorable for its reproduction, and heavy rain has an inhibitory effect. There are more than 30 kinds of natural enemies, including grasshoppers, insectivores, six-pointer horses, and prey.
Control methods (1) Pay attention to clearing the field and weeds. (2) Pay attention to the prevention and cure of drought in the cotton field and the areas where the cotton seedlings have suffered heavy damage in the year of the high temperature in May in the spring of cotton cinnabar in the Wotaochun cotton field. When the rate of white and yellow spotted cotton plants reaches 20%, every 667m2 of spring cotton uses 5% aldicarb 1 to 1.25kg or 3% carbofuran 2kg and 5% phorate granules 2.5kg. The hole was applied to the soil. (3) In June, July and August, the drought and little rain, the population of cotton leafhoppers increased. When the rate of yellow and white spots on cotton leaves reached 20%, 20% of dicofol was sprayed immediately. 1500 times or 20% triclosan 800 times, 50% ubiquitous phosphorus 1500 times, 10% Liuyangmycin EC 1000 times, 44% worms 667m2 33ml. (4) In areas or fields where C. cinnabarinus is resistant to the above insecticides, 73% of Chrysanthemum Emulsion 3000 times or 5% Cascade Emulsion 1500 times, 20% sesame seed oil 3000 times can be used. Liquid, 50% sulphur suspension 300 times, 15% elixir (Broomfly, Altair) 2500 times emulsion, 10% imidacloprid wettable powder 2500 times, 10% depleted emulsion 2000 times, 1 .8% edford (BA-1) 5000 times anti-infective acaricidal acaricide. In addition, 80% dichlorvos emulsifiable concentrate and 20% triclosan can also be used to dilute 4:1 into 1000-fold dilutions, which has a high control effect on resistant leafhoppers.
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