Cotton jacket

Scientific name Aphis gossypii G10ver Homoptera, Amaranthidae. Alias ​​honeyworm, insects, oil sweat and so on. Distributed in Tibet but not reported, widely distributed throughout the country. The greater density in the east half is an important pest in cotton seedlings. In recent years, the proportion of Xinjiang has also increased. The early occurrence of the Yellow River Basin, the Liaohe River Basin, and the inland cotton region in the northwest was a serious problem.

Host cotton, eggplant, pepper, melons, pepper and so on.

Injury characteristics Cotton gills pierce into the back or tender head of the cotton leaf with a sucking mouthpiece and suck the juice. Damage during seedling stage, cotton leaf curling, flowering and belling period are delayed; adult plant stage suffers, upper leaves curl, middle leaves appear shine, the lower leaves yellow off, leaves with honeydew excretion of the aphids, easy to induce mold breeding. Lei Ling victims, easy to drop buds, affect the development of cotton plants.

The morphological characteristics of the dry mother is 1.6mm long, dark brown, five antennae, no wings. The wingless females have a body length of 1.5-1.9mm, yellow, blue, dark green, and dark green. The antennae are approximately half as long as the body length, and the antennae have no sensory circle in the third quarter. Section 5 There are one, and there are 3-4 inflated parts of section 6. Compound eyes dark red. Abdominal tube is short, black and blue. The tail piece is cyan, with three setae on each side, and the body surface is covered with white wax powder. The size of a female embryo with wings is similar to that of a female with a wingless embryo, which is yellow and light green to dark green. Antennae shorter than the body, head and chest black, two pairs of wings transparent, midrib three. The egg is 0.5mm long and oval in shape. It is yellowish orange when it is first produced, and it is black and shiny after being painted. Wingless if a total of 4 years of age, summer yellow to yellow-green, spring and autumn blue gray, compound eye red. Wings are also 4 years old. It is yellow in summer, grayish yellow in autumn, and wing buds after 2 years of age. There is a white round spot on each side of the abdomen on the 1st and 6th and on the 2nd, 3rd, and 4th sides of the abdomen.

Life habits The Liaohe River area is 10 to 20 generations old, 20 to 30 generations in the Yellow River Basin, the Yangtze River, and the South China Cotton Region. The northern cotton region winters with eggs on wintering hosts. In the spring of the following winter, after the host has germinated, the overwintering egg is hatched as a dry mother. After 2-3 generations of parthenogenetic reproduction, a female with winged fetus is produced, and from April to May, it migrates into the cotton field and damages the newly emerged cotton seedling. It is followed by breeding in cotton fields, from May to June into the peak period of damage, and the amount of earthworms is reduced after the end of June, but the duration of the drought is prolonged. In the middle and late October, winged females are born and migrated back to their winter hosts to produce wingless sexual females and winged males. After mating, females and males lay their eggs over the winter to cover their gaps or buds. In the Yellow River Basin and the Yangtze River Basin, the overwintering hosts of the peppers, wood mold, buckthorn, pomegranate, hollyhock, prunella vulgaris, plantain, chrysanthemum, bitter herbs, and melons are also wintering. Incubation in March of the following year, breeding 3-4 generations on overwintering hosts, until the end of April, after the emergence of cotton seedlings, winged maggots migrated into the cotton fields to breed, and in late May and early June to enter the peak period of seedling locust damage; 7 In mid-January and August, the formation of Fuxi was inflicted. When the cotton plants in the fall are old, they migrate back to the overwintering host and produce a unique generation of males. After mating with females, they lay their eggs at buds and shoots for winter. Cotton aphids can be divided into seedlings and buckwheat in the cotton field by season. Miao Miao occurred in the end of June, mid-May to late June to the bud before entering the prosperous period. Adapted to the low temperature, the temperature is higher than 27 °C reproduction is inhibited, the population rapidly decreased. Fuxi occurred in the middle and late July to August, and it was adapted to high temperatures, and it proliferated at 27-28°C. When the average temperature was higher than 30°C on that day, the number of insect populations decreased. Heavy rain has a significant inhibitory effect on cotton aphid. Rainy or rainy seasons are unfavorable, but when the weather is sunny, the weather facilitates the rapid proliferation of the volt. Ordinary Fuxi 4 to 5 days on the proliferation of l generation, seedlings need more than 10 days to breed a generation, field generations overlap. The winged dragonfly has a tendency towards yellow. The high temperature in winter and the high hatching rate of overwintering eggs. Cotton aphids occur at an appropriate temperature of 17.6–24°C and a relative humidity of less than 70%. When a cotton-wadded corps was sown and planted early in the cotton field, it was seriously affected. When the cotton and wheat, rapeseed, and broad beans were interplanted, the cotton locust occurred late and light. Natural enemies mainly include parasitic bees, crickets, predatory ladybugs, grasshoppers, spiders, and insectivorouss. One ladybug and grass Ling control effect. Improper use of insecticides in production, killing too many natural enemies, can lead to damage caused by thorium.

Prevention and control methods (1) Agricultural control In winter and spring, weeding and weeds in the field are eliminated. In the early spring, omethoate is sprayed on overwintering hosts to eliminate the aphids on overwintering hosts. Cotton and wheat were interplanted, and spring corn, sorghum, and rapeseed were planted in the cotton fields or planted on the ground to attract natural enemies to control cotton field locusts. Two crops a year, cotton, cotton, rapeseed cotton, faba bean cotton and other intercropping, combined with seedlings, Dingmiao, pruning rights, the insect pests removed, cut off the pests brought to the field, concentrated burning. (2) Medicinal seed dressing for spring cotton area, first pre-soak cottonseeds in warm water of 55-60°C for 30 minutes, remove and dry to the kind of hair white, dilute 30 times with 40% formazan 400ml, spray mix for 50kg Cotton seeds, sowed after 12 hours of boring, or seed dressing with 1.5% of the seed weight of 70% exterminate pine powder dressing, can also be used 3% carbofuran granules 20kg mixed 100kg cotton seeds, and then boring after 4-5 hours sowing . It is also possible to apply the granules to the sowing ditch at the time of sowing, and then cover the soil. Can also be used 10% imidacloprid active ingredient 50 to 60g mixed cotton seed 100kg, good effect against cotton aphid and cotton leaf leafhopper, sowing rate is 10 to 60% in 45-60 days sowing, relative control effect of 100 aphid amount It is 72.6-85.7% and 84.8-97.3%. Production can reduce the number of flooding. Cotton sowing planting cotton late, with imidacloprid dressing can basically control its damage. (3) The medicine drops heart 40% monocrotophos EC or 50% methamidophos EC, 40% omethoate EC 150 to 200 times, every 667m2 use good liquid 1-1.5kg, with sprayer Cotton seedlings heart 3 - 5cm high drop heart for 1 second, so that liquid medicine like snowflakes covered with droplets in the heart of cotton seedlings can be. (4) Apply 40% monocrotophos or 50% methamidophos cream 20ml, sesbania powder 1g or polyvinyl alcohol 2g to the stem, and mix 100ml of water. Apply the liquid to cotton stalks at the adult stage. Red and green junctions do not have to be repainted. (5) Before 3 true leaves of Miaojing, the planting rate of leaf rolling is 5-10%, the rate of leaf rolling after 4 true leaves is 10-20%, and the rate of volvulus leaf rolling is 5-10% or average per plant. In the middle and lower part, the amount of three leafhoppers is 150 to 200, timely spraying 35% Saidam EC 1500 times or 20% methomyl EC, 44% Profenofos 1500 times, 40% anti-ringing oil 1200 times, 20% Kang Fu Duo Concentrate Solvent 3000-4000 Diluent, 43% New Braun Emulsion (Xin Fluoro Cyanide Emulsion) 1500 Diluent (Beijing Shunyi Pesticide Factory), 90% Accelerated Soluble Powder 3500 Diluent, 20% Good Year Winter milk can prevent 1000 times of Fuxi, and 2000 times of seedling can be used. When necessary, the above insecticides and synergists are used together to improve the control effect and delay drug resistance. The sensitivity of Aphis gossypii to pyrethroid insecticides is still poor, and some produce significant drug resistance and should not be used to control cotton aphid. 44% Profenofos EC, 40% Methoracate EC, 40% Chlorpyrifos EC 1500 times The effect of cotton aphid prevention and treatment reaches more than 70%. It can be seen that the control effect of cotton aphid is not ideal, but the control effect against cotton bollworm is good. In the prevention and control of the 314 generation of cotton bollworm, and the middle of cotton growth in the middle of the Fuxi and leafhoppers. In addition, the use of 20% butylthiocarbapotris 6000 times liquid high control effect, the effective period of about 7 days; carbamate 20% of the dicamba and organic chlorine 35% saidan (endosulfan) EC 1500 Double liquid is a highly effective agent for preventing and curing cotton aphid, which has a control effect of more than 90% for 1-7 days.