The focus of cotton seedling prevention and control during seedling stage is seedling diseases and pests such as nursery and tigers. In the seedling stage, the soil should be ploughed and the soil layer should be destroyed. This will not only improve the ground temperature, but also reduce the occurrence of disease at the seedling stage, and can remove weeds and eliminate some of the tiger's eggs and newly hatched larvae.
I. Nursery When the rate of sputum is 30% and the rate of coiled leaves is 5%, the systemic drop can be used. The drug can be selected from 40% omethoate 100 times solution and 20% methomyl 250 times solution. The nozzle of Gongnong 16 sprayer is wrapped with gauze, the switch is opened 1/3, the drug is dropped on the tip of the cotton plant, 1 to 2 drops per plant before 3 true leaves, and 2 to 3 drops after 4 true leaves. drop. Each acre can also be applied with 2.5% of promethrin emulsifiable concentrate 30 ml, and sprayed against 30 kg of water. However, when the proportion of natural enemies and nurseries in the field such as ladybugs is greater than 1:120, the natural enemy can control the nursery damage.
Second, the ground tiger Prevention and control of the 3rd pre-land tiger, can be poisonous soil. Use 5% of chlorpyrifos granules per acre for 3 kg, add appropriate amount of fine sand and mix evenly, or use 48% of espresso emulsifiable concentrate 300 ml per acre, add 20 kg of fine sand and mix evenly, and apply it in the evening. If the tiger is more than 3 years old, it should be controlled with trichlorfon baits. Use 90% of the crystal trichlorfon 100 grams, add 1 kg of water, mix 10 kg of wheat bran or cotton cake, and spread it in the evening on the ridge, sprinkle 2 to 3 kg per mu, the effect is more than 80%.
The focus of prevention and control during this period from bud to boll opening is cotton bollworm, Fuxi, cotton blind, cotton leafhopper, wilt, verticillium and cotton boll.
After the wheat harvest, it will be ploughed and smashed in time to kill the first generation of cotton bollworm. Combine pruning and snoring, artificially smear eggs, catch old larvae, take madness, top, side and ineffective flower buds, rotten bells, etc. out of the field, and concentrate them. In the later stage of cotton growth, it is necessary to remove old leaves and empty branches in time.
First, the cotton bollworm Anti-insect cotton does not need to spray to prevent the second generation of cotton bollworm. Conventional cotton control of the second generation of cotton bollworm should be mastered in the adult spawning period. When the ratio of the total amount of effective natural enemies to the number of bollworm eggs is 1:2 to 1:3, natural enemies can control cotton bollworms without the need for pesticide control. When there are few natural enemies and the total number of eggs in the cotton bollworm exceeds 100, the cotton bollworm nuclear polyhedrosis virus (npv) can be selected per acre, or 1.8% of the worms can be sprayed with 3000-5000 times. Prevention and control of third and fourth generation cotton bollworms should be carried out according to the actual situation in the field. When the three generations of cotton bollworm have 5 to 8 heads of 1 to 2 instar larvae and 10 to 15 heads of 1st to 2nd instar larvae of 4th generation of cotton bollworms, 4.5% of cypermethrin EC can be used per acre 60 to 100 ml, 2.5 % of promethrin emulsifiable concentrate 40 ~ 50 ml, 25% of quick-killing king emulsifiable concentrate 72 ~ 80 ml, spray control of 50 ~ 60 kg of water. When controlling the third and fourth generations of cotton bollworms, because the cotton plants are large, the cotton bollworms lay eggs scattered. When spraying, care should be taken to make the cotton tops and flower buds uniform. At the same time, the medicine should be used alternately and rotated. After the application, it should be replenished in time.
2. Fuxi When the amount of sputum in the upper, middle and lower leaves of a hundred plants is 10,000 to 15,000, it is necessary to use chemical control. Each mu can use 10% Dagong WP 10-15g, 2.5% Fufeng chrysanthemum EC 20-30ml, 4.5% Cypermethrin EC 30-60ml, spray 50kg water.
Third, the cotton blind è½ When the rate of cotton damage to the plant reaches 10%, each acre can choose 10% of the great WP 5.7 grams, 20% of the good winter emulsifiable oil 15 ml, 10 grams of the net, 40 to the water ~ 50 kg, spray in the evening.
4. The control index of cotton leafhopper is 3% of red leaf rate. Each acre can be controlled with 1.8% of Jiji worm emulsifiable concentrate 3000-5000 times liquid spray.
5. Cotton red bollworm In the incubation period of cotton bollworm eggs, 2.5% of the cyhalothrin or the enemy killed 2000 times liquid spray control.
6. New crops of cotton wilt and verticillium wilt, can be removed from the sporadic disease plant, burned with the leaves, and then use 50% of cotton stalks per square meter, 70 grams of diseased soil around the diseased plant The agent is treated and covered with a layer of pure soil. When the sporadic disease plant begins to appear, it can be sprayed with 57.6% of Guanxiqing dry granules 1000-1400 times solution and 25% bacteria 100 grams of emulsifiable concentrate 1500 times solution. Spray once every 10 to 15 days, even spray 3~ 4 times. It can also be irrigated with 5% of the bactericidal water-clearing agent 200-300 times.
Seven, cotton boll disease Summer rainy or cotton field closed, easy to induce cotton boll disease. In the early stage of the disease, 12.5% ​​of Heguoli WP 2,000-3000 times liquid, or 57.6% of Guan Guqing dry granules 1000-1400 times liquid spray can be used for prevention and treatment.
I. Nursery When the rate of sputum is 30% and the rate of coiled leaves is 5%, the systemic drop can be used. The drug can be selected from 40% omethoate 100 times solution and 20% methomyl 250 times solution. The nozzle of Gongnong 16 sprayer is wrapped with gauze, the switch is opened 1/3, the drug is dropped on the tip of the cotton plant, 1 to 2 drops per plant before 3 true leaves, and 2 to 3 drops after 4 true leaves. drop. Each acre can also be applied with 2.5% of promethrin emulsifiable concentrate 30 ml, and sprayed against 30 kg of water. However, when the proportion of natural enemies and nurseries in the field such as ladybugs is greater than 1:120, the natural enemy can control the nursery damage.
Second, the ground tiger Prevention and control of the 3rd pre-land tiger, can be poisonous soil. Use 5% of chlorpyrifos granules per acre for 3 kg, add appropriate amount of fine sand and mix evenly, or use 48% of espresso emulsifiable concentrate 300 ml per acre, add 20 kg of fine sand and mix evenly, and apply it in the evening. If the tiger is more than 3 years old, it should be controlled with trichlorfon baits. Use 90% of the crystal trichlorfon 100 grams, add 1 kg of water, mix 10 kg of wheat bran or cotton cake, and spread it in the evening on the ridge, sprinkle 2 to 3 kg per mu, the effect is more than 80%.
The focus of prevention and control during this period from bud to boll opening is cotton bollworm, Fuxi, cotton blind, cotton leafhopper, wilt, verticillium and cotton boll.
After the wheat harvest, it will be ploughed and smashed in time to kill the first generation of cotton bollworm. Combine pruning and snoring, artificially smear eggs, catch old larvae, take madness, top, side and ineffective flower buds, rotten bells, etc. out of the field, and concentrate them. In the later stage of cotton growth, it is necessary to remove old leaves and empty branches in time.
First, the cotton bollworm Anti-insect cotton does not need to spray to prevent the second generation of cotton bollworm. Conventional cotton control of the second generation of cotton bollworm should be mastered in the adult spawning period. When the ratio of the total amount of effective natural enemies to the number of bollworm eggs is 1:2 to 1:3, natural enemies can control cotton bollworms without the need for pesticide control. When there are few natural enemies and the total number of eggs in the cotton bollworm exceeds 100, the cotton bollworm nuclear polyhedrosis virus (npv) can be selected per acre, or 1.8% of the worms can be sprayed with 3000-5000 times. Prevention and control of third and fourth generation cotton bollworms should be carried out according to the actual situation in the field. When the three generations of cotton bollworm have 5 to 8 heads of 1 to 2 instar larvae and 10 to 15 heads of 1st to 2nd instar larvae of 4th generation of cotton bollworms, 4.5% of cypermethrin EC can be used per acre 60 to 100 ml, 2.5 % of promethrin emulsifiable concentrate 40 ~ 50 ml, 25% of quick-killing king emulsifiable concentrate 72 ~ 80 ml, spray control of 50 ~ 60 kg of water. When controlling the third and fourth generations of cotton bollworms, because the cotton plants are large, the cotton bollworms lay eggs scattered. When spraying, care should be taken to make the cotton tops and flower buds uniform. At the same time, the medicine should be used alternately and rotated. After the application, it should be replenished in time.
2. Fuxi When the amount of sputum in the upper, middle and lower leaves of a hundred plants is 10,000 to 15,000, it is necessary to use chemical control. Each mu can use 10% Dagong WP 10-15g, 2.5% Fufeng chrysanthemum EC 20-30ml, 4.5% Cypermethrin EC 30-60ml, spray 50kg water.
Third, the cotton blind è½ When the rate of cotton damage to the plant reaches 10%, each acre can choose 10% of the great WP 5.7 grams, 20% of the good winter emulsifiable oil 15 ml, 10 grams of the net, 40 to the water ~ 50 kg, spray in the evening.
4. The control index of cotton leafhopper is 3% of red leaf rate. Each acre can be controlled with 1.8% of Jiji worm emulsifiable concentrate 3000-5000 times liquid spray.
5. Cotton red bollworm In the incubation period of cotton bollworm eggs, 2.5% of the cyhalothrin or the enemy killed 2000 times liquid spray control.
6. New crops of cotton wilt and verticillium wilt, can be removed from the sporadic disease plant, burned with the leaves, and then use 50% of cotton stalks per square meter, 70 grams of diseased soil around the diseased plant The agent is treated and covered with a layer of pure soil. When the sporadic disease plant begins to appear, it can be sprayed with 57.6% of Guanxiqing dry granules 1000-1400 times solution and 25% bacteria 100 grams of emulsifiable concentrate 1500 times solution. Spray once every 10 to 15 days, even spray 3~ 4 times. It can also be irrigated with 5% of the bactericidal water-clearing agent 200-300 times.
Seven, cotton boll disease Summer rainy or cotton field closed, easy to induce cotton boll disease. In the early stage of the disease, 12.5% ​​of Heguoli WP 2,000-3000 times liquid, or 57.6% of Guan Guqing dry granules 1000-1400 times liquid spray can be used for prevention and treatment.
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