Aphis gossypii is an important pest of cotton seedlings and is widely distributed throughout the country. It has become one of the main pests in cotton producing areas and one of the main factors affecting cotton yield and quality.
1. Characteristics of the damage The cotton aphid punctures the back of the cotton leaf or the tender head with a sucker, sucking the juice. In the seedling stage, the cotton leaves are curled up, and the flowering and bolling period is postponed; the adult stage is damaged, the upper leaves are curled, the middle leaves are oily, the lower leaves are yellow, and the leaves are covered with honeydew, which is easy to induce mold growth. The bud bell is damaged and easy to fall, affecting the development of cotton plants.
2. Morphological characteristics The dry mother body is 1.6 mm long, brown in color, with 5 antennas and no wings. The wingless viviparous female body is 1.5 to 1.9 mm long, and has a body color of yellow, cyan, dark green, dark green, etc., and the antenna length is about half of the body length. The size of the winged female is similar to that of the wingless female, which is yellowish, light green to dark green. Wingless scorpion is 4 years old, yellow to yellowish green in summer, blue-gray in spring and autumn, and red in compound eyes. Winged scorpion is also 4 years old, yellow in summer, gray-yellow in autumn, and winged after 2 years of age.
3. Living habits The northern cotton area occurs 10 to 20 generations a year, and the eggs are overwintered on wintering hosts such as pepper, hibiscus and pomegranate. After the germination of the wintering host in the spring of the next year, the overwintering eggs hatch as dry mothers. After 2 to 3 generations of parthenogenesis, the winged females are born, and they move into the cotton fields from April to May, killing the newly unearthed cotton seedlings and then breeding in the cotton fields. From May to June, it entered the peak period of damage, and after the end of June, the amount of sputum decreased, but the drought period was prolonged. In the middle and late October, a winged sex mother is born, and the wintering host is moved back to produce a wingless sexual female and a winged male. After mating of males and females, they lay eggs in the gaps or buds of wintering host branches for wintering. Cotton aphid can be divided into nursery and Fuxi in the cotton field according to the season. The nursery occurs at the end of June, from mid-May to mid-June to the beginning of the bud, and enters into a precarious period. The cotton aphid adapts to the low temperature, the temperature is higher than 27 °C, the reproduction is inhibited, and the insect mouth is rapidly reduced. Fuxi occurred in the middle to late July to August, and was adapted to the high temperature. It was multiplied at 27-28 °C. When the average temperature was higher than 30 °C, the number of insects decreased. Heavy rain has a significant inhibitory effect on cotton aphid. It is unfavorable for rainy years or rainy seasons, but the rainy weather is good for the rapid growth of Fuxi. Generally, the volts grows for 4 generations in 4 to 5 days, and the nursery takes more than 10 days to breed for 1 generation, and the field overlaps. Winged crickets tend to be yellow. The cotton aphid has a suitable temperature of 17 to 24 ° C and a relative humidity of less than 70%. A cotton-cotton field and early-stage cotton aphid moved into the early stage, which was harmful. When cotton and wheat, rapeseed, and broad beans were interplanted, the cotton aphid occurred late and light. Natural enemies mainly include parasitic wasps, predatory ladybugs, grasshoppers, and spiders. Among them, ladybug and grasshopper have a greater control effect. Improper application of pesticides on production, killing too many natural enemies, will cause Fuxi to harm.
4. Prevention and control methods 1 Agricultural control. In the winter and spring seasons, the weeds in the fields and the grounds are removed. In the early spring, the over-winter hosts are sprayed with omethoate to eliminate the mites on the wintering hosts. Carry out cotton and wheat interplanting, sowing in the cotton field or planting spring corn, sorghum, rapeseed, etc., attracting natural enemies to control cotton locusts. 2 seed treatment. It can effectively prevent the damage of cotton aphid by coating with a coating agent containing carbofuran or chlorpyrifos. It can also be applied to the seeding ditch with 3% carbofuran granules, and then covered with soil. It is also possible to use 10% imidacloprid active ingredient 50-60 g of cotton mixed seed 100 kg. 3 drops of medicine heart. Use 40% monocrotophos or 50% methamidophos EC, 40% omethoate EC 150-200 times solution, use 1 to 1.5 kg per 667 square meters of good liquid, use a sprayer in the top of the cotton seedlings 3 Drop the heart for ~1cm at a height of 5cm, so that the liquid can be sprayed on the top of the cotton seedling. 4 liquid solution coated with stems. Use 40% monocrotophos or 50% methamidophos EC 20 ml, 1 gram of gum powder or 2 g of polyvinyl alcohol, mix well with 100 ml of water, apply the liquid to the red and green of cotton stems in the adult stage At the junction, you don't have to recoat, don't paint. 5 before the 3 true leaves of the nursery, the rate of coiled leaves is 5% to 10%, the rate of the leaves after 4 leaves is 10% to 20%, and the rate of the leaves of Fuxi coil is 5% to 10% or the average top of the plants. The central and lower 3 leaf stalks are 150-200 heads, and timely spray 35% Sai Dan emulsifiable oil 1500 times liquid or 20% weiduowei chyle, 44% profenofos emulsifiable oil 1500 times liquid, 40% anti-bell emulsifiable concentrate 1200 times Liquid, 43% octane chlorofluorocyanate EC 1500 times solution, 90% fast-acting soluble powder 3500 times solution, 20% good winter emulsifiable milk control Fuxi 1000 times solution, nursery 2000 times solution. When necessary, the above-mentioned insecticide is mixed with a synergist to improve the control effect and delay the drug resistance. The sensitivity of cotton aphid to pyrethroid insecticides is very poor, and some have obvious resistance, which is not suitable for the control of cotton aphid. In addition, the use of 20% butyl thiocarbazone emulsifiable concentrate 6000 times liquid has high control effect, and the duration of effect is about 7 days; 20% of the carbamates and 105% of the organochlorines are 35% of the dandan emulsifiable concentrates. Cotton aphid high-efficiency agent, more than 90% of the effect of 1 to 7 days.
1. Characteristics of the damage The cotton aphid punctures the back of the cotton leaf or the tender head with a sucker, sucking the juice. In the seedling stage, the cotton leaves are curled up, and the flowering and bolling period is postponed; the adult stage is damaged, the upper leaves are curled, the middle leaves are oily, the lower leaves are yellow, and the leaves are covered with honeydew, which is easy to induce mold growth. The bud bell is damaged and easy to fall, affecting the development of cotton plants.
2. Morphological characteristics The dry mother body is 1.6 mm long, brown in color, with 5 antennas and no wings. The wingless viviparous female body is 1.5 to 1.9 mm long, and has a body color of yellow, cyan, dark green, dark green, etc., and the antenna length is about half of the body length. The size of the winged female is similar to that of the wingless female, which is yellowish, light green to dark green. Wingless scorpion is 4 years old, yellow to yellowish green in summer, blue-gray in spring and autumn, and red in compound eyes. Winged scorpion is also 4 years old, yellow in summer, gray-yellow in autumn, and winged after 2 years of age.
3. Living habits The northern cotton area occurs 10 to 20 generations a year, and the eggs are overwintered on wintering hosts such as pepper, hibiscus and pomegranate. After the germination of the wintering host in the spring of the next year, the overwintering eggs hatch as dry mothers. After 2 to 3 generations of parthenogenesis, the winged females are born, and they move into the cotton fields from April to May, killing the newly unearthed cotton seedlings and then breeding in the cotton fields. From May to June, it entered the peak period of damage, and after the end of June, the amount of sputum decreased, but the drought period was prolonged. In the middle and late October, a winged sex mother is born, and the wintering host is moved back to produce a wingless sexual female and a winged male. After mating of males and females, they lay eggs in the gaps or buds of wintering host branches for wintering. Cotton aphid can be divided into nursery and Fuxi in the cotton field according to the season. The nursery occurs at the end of June, from mid-May to mid-June to the beginning of the bud, and enters into a precarious period. The cotton aphid adapts to the low temperature, the temperature is higher than 27 °C, the reproduction is inhibited, and the insect mouth is rapidly reduced. Fuxi occurred in the middle to late July to August, and was adapted to the high temperature. It was multiplied at 27-28 °C. When the average temperature was higher than 30 °C, the number of insects decreased. Heavy rain has a significant inhibitory effect on cotton aphid. It is unfavorable for rainy years or rainy seasons, but the rainy weather is good for the rapid growth of Fuxi. Generally, the volts grows for 4 generations in 4 to 5 days, and the nursery takes more than 10 days to breed for 1 generation, and the field overlaps. Winged crickets tend to be yellow. The cotton aphid has a suitable temperature of 17 to 24 ° C and a relative humidity of less than 70%. A cotton-cotton field and early-stage cotton aphid moved into the early stage, which was harmful. When cotton and wheat, rapeseed, and broad beans were interplanted, the cotton aphid occurred late and light. Natural enemies mainly include parasitic wasps, predatory ladybugs, grasshoppers, and spiders. Among them, ladybug and grasshopper have a greater control effect. Improper application of pesticides on production, killing too many natural enemies, will cause Fuxi to harm.
4. Prevention and control methods 1 Agricultural control. In the winter and spring seasons, the weeds in the fields and the grounds are removed. In the early spring, the over-winter hosts are sprayed with omethoate to eliminate the mites on the wintering hosts. Carry out cotton and wheat interplanting, sowing in the cotton field or planting spring corn, sorghum, rapeseed, etc., attracting natural enemies to control cotton locusts. 2 seed treatment. It can effectively prevent the damage of cotton aphid by coating with a coating agent containing carbofuran or chlorpyrifos. It can also be applied to the seeding ditch with 3% carbofuran granules, and then covered with soil. It is also possible to use 10% imidacloprid active ingredient 50-60 g of cotton mixed seed 100 kg. 3 drops of medicine heart. Use 40% monocrotophos or 50% methamidophos EC, 40% omethoate EC 150-200 times solution, use 1 to 1.5 kg per 667 square meters of good liquid, use a sprayer in the top of the cotton seedlings 3 Drop the heart for ~1cm at a height of 5cm, so that the liquid can be sprayed on the top of the cotton seedling. 4 liquid solution coated with stems. Use 40% monocrotophos or 50% methamidophos EC 20 ml, 1 gram of gum powder or 2 g of polyvinyl alcohol, mix well with 100 ml of water, apply the liquid to the red and green of cotton stems in the adult stage At the junction, you don't have to recoat, don't paint. 5 before the 3 true leaves of the nursery, the rate of coiled leaves is 5% to 10%, the rate of the leaves after 4 leaves is 10% to 20%, and the rate of the leaves of Fuxi coil is 5% to 10% or the average top of the plants. The central and lower 3 leaf stalks are 150-200 heads, and timely spray 35% Sai Dan emulsifiable oil 1500 times liquid or 20% weiduowei chyle, 44% profenofos emulsifiable oil 1500 times liquid, 40% anti-bell emulsifiable concentrate 1200 times Liquid, 43% octane chlorofluorocyanate EC 1500 times solution, 90% fast-acting soluble powder 3500 times solution, 20% good winter emulsifiable milk control Fuxi 1000 times solution, nursery 2000 times solution. When necessary, the above-mentioned insecticide is mixed with a synergist to improve the control effect and delay the drug resistance. The sensitivity of cotton aphid to pyrethroid insecticides is very poor, and some have obvious resistance, which is not suitable for the control of cotton aphid. In addition, the use of 20% butyl thiocarbazone emulsifiable concentrate 6000 times liquid has high control effect, and the duration of effect is about 7 days; 20% of the carbamates and 105% of the organochlorines are 35% of the dandan emulsifiable concentrates. Cotton aphid high-efficiency agent, more than 90% of the effect of 1 to 7 days.
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