Cotton aphid is an important pest in cotton seedlings and widely distributed throughout the country. It has become one of the main pests in cotton production areas and one of the major factors affecting cotton yield and quality. 1. Damage characteristics Cotton gills pierce the back or tender head of cotton leaves 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. 2. Morphological characteristics The dry mother is 1.6 mm in length, dark brown, with 5 antennae and no wings. The wingless females have a body length of 1.5 to 1.9 mm and are yellow, blue, dark green and dark green. The antennae are approximately half as long as the body length. 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. 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, yellow in summer, grayish yellow in autumn and winged after 2 years of age. 3. Habits of life The Northern Cotton Region occurs 10 to 20 generations a year, and winterizes with eggs on wintering hosts such as pepper, hibiscus, and pomegranate. In the spring of the following winter, the host germinates through the winter, and the overwintering egg hatches as the dry mother. After 2 to 3 generations of parthenogenetic reproduction, females with winged fetuses are born. From April to May, they migrate to the cotton fields and injure the newly emerged cotton seedlings and reproduce them in the cotton fields. From May to June, it entered the peak period of damage, and the amount of earthworms decreased after the end of June, but the duration of drought was 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. Cotton aphids can be divided into seedlings and buckwheat in the cotton field by season. Miao Miao occurred in the end of June, from mid-May to late June to the bud, before entering the flood season. Cotton aphids adapt to low temperatures, the temperature is higher than 27°C, reproduction is inhibited, and the population rapidly decreases. Fuxia occurred in the middle and late July to August, and it was adapted to high temperatures. It proliferated at 27 to 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 a generation, seedlings need more than 10 days breeding 1 generation, field generations overlap. The winged dragonfly has a tendency towards yellow. The cotton cocoon produces a suitable temperature of 17 to 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, predatory ladybugs, grasshoppers, and spiders. Among them, ladybugs and grasshoppers have a greater control effect. Improper use of insecticides in production, killing too many natural enemies, can lead to damage caused by thorium. 4. Control methods 1 Agricultural control. In winter and spring, the weeds in the fields and fields are eradicated, and omethoate is sprayed on overwintering hosts in the early spring to eliminate the aphids on overwintering hosts. Cotton and wheat were interplanted, and spring corn, sorghum, and rapeseed were planted in the cotton field or planted on the ground to attract natural enemies to control cotton fieldworms. 2 seed processing. Seeding with a seed coating containing carbofuran or quebrachosol can effectively prevent the harm of cotton aphid. It is also possible to apply 3% carbofuran granules to the sowing ditch and then cover the soil. It can also be used 10% imidacloprid active ingredient 50 ~ 60 grams mixed cotton 100 kg. 3 medicine drops heart. Use 40% monocrotophos EC or 50% methamidophos EC, 40% omethoate EC 150 to 200 times, 1 to 1.5 kg per 667 square meters with good liquid, sprayer in the heart of cotton seedlings 3 ~ 5 centimeters high drop heart for 1 second, so that liquid medicine like a snow-capped top spray in the heart of cotton seedlings can be. 4 liquid coating stem. Use 40% monocrotophos or 50% methamidophos EC 20 ml, sesbania powder 1 g or polyvinyl alcohol 2 g, stir 100 ml of water, and apply the liquid to the red and green cotton stalks at the adult stage. At the junction, there is no need to repaint and do not apply. 5 Miaojing 3 leaves before the true, the rolling leaf rate of 5% to 10%, 4 true leaves after the rolling leaf rate of 10% to 20%, Fuxi rolling leaf strain rate of 5% to 10% or the average plant top , Central and lower 3 leaves weigh 150 to 200 heads, spray 35% Saidam EC 1500 times or 20% Methomyl emulsion, 44% Profenofos 1500 times, 40% Inactivated Bell Oil 1200 times Liquid, 43% fluorinated chlorinated cyanide emulsion 1500 times, 90% fasting soluble powder 3500 times, 20% of good New Year's milk to prevent Fuxi 1000 times, seedling locust 2000 times can be. When necessary, the above insecticides and synergists are used together to improve the control effect and delay drug resistance. The sensitivity of cotton aphid to pyrethroid insecticides is poor, and some produce significant drug resistance and should not be used to control cotton aphids. In addition, the use of 20% butylthiocarbapotris 6000 times liquid high control effect, the effective period of about 7 days; carbamate 20% methomyl and organic chlorine 35% Saitan oil 1500 times is to prevent and control Cotton pot high-effective pharmaceuticals, 1 to 7 days 90% control effect.
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Chinese Medicinal Herbs Animal
Chinese Medicinal Herbs Animal,Periostracum Cicadae,Traditonal Chinese Medicine Scorpio,Chinese Medicine Galla Chinensis
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