One, cotton bollworm. To master the prevention and control indicators and application techniques, when the accumulated generation of 100 buds and bells of three generations of cotton bollworms reaches 100 eggs or 10 larvae, chemical control should be carried out. Chlorpyrifos, Meth salt, and phoxim should be used. Such as prevention. However, Bt bio-agents are banned in insect-resistant cotton fields.
Second, cotton brown wilt can do a good job on the basis of pesticide treatment, grasping the key points in the early stages of spraying the prevention and control of spraying, and spray once every 10 days, generally even about 3 times. Of course, there are conditions where rotations can be made with grass crops for more than two years. Control agents can be used fulvic acid, ethyl allicin plus carbendazim, mancozebite.
3. Prevention and Control of Cotton Blindness and Stasis: Advocates large-scale unified prevention and control at the same time, and can use half of the pesticides such as acetamiprid, imidacloprid, malathion, and chlorpyrifos. Prevention time should be before 9 am and after 4 pm, when spraying, aim at tender heads, side hearts, and budding bells. Emphasis on thorough spraying and scale prevention and prevention. Pay attention not to cherish the water and not to waste medicine. Do not spray with dew.
4. The stem blight of cotton leaves is mainly caused by potassium deficiency. During the flowering and bolling period, cotton grows vigorously, and the potassium requirement is greatly increased. If the supply of potash in the field is insufficient, cotton blight is prone to occur. It can be combined with control of yellowing wilt disease, spraying 0.2% ~ 0.3% of potassium dihydrogen phosphate solution early, spray once every 7 days, to spray 2 ~ 3 times continuously.
Five, cotton aphid, cotton red spider aphids can use imidacloprid, acetamiprid, etc.; red spider use avermectin and organophosphorus pesticides, half a mixed spray.
Second, cotton brown wilt can do a good job on the basis of pesticide treatment, grasping the key points in the early stages of spraying the prevention and control of spraying, and spray once every 10 days, generally even about 3 times. Of course, there are conditions where rotations can be made with grass crops for more than two years. Control agents can be used fulvic acid, ethyl allicin plus carbendazim, mancozebite.
3. Prevention and Control of Cotton Blindness and Stasis: Advocates large-scale unified prevention and control at the same time, and can use half of the pesticides such as acetamiprid, imidacloprid, malathion, and chlorpyrifos. Prevention time should be before 9 am and after 4 pm, when spraying, aim at tender heads, side hearts, and budding bells. Emphasis on thorough spraying and scale prevention and prevention. Pay attention not to cherish the water and not to waste medicine. Do not spray with dew.
4. The stem blight of cotton leaves is mainly caused by potassium deficiency. During the flowering and bolling period, cotton grows vigorously, and the potassium requirement is greatly increased. If the supply of potash in the field is insufficient, cotton blight is prone to occur. It can be combined with control of yellowing wilt disease, spraying 0.2% ~ 0.3% of potassium dihydrogen phosphate solution early, spray once every 7 days, to spray 2 ~ 3 times continuously.
Five, cotton aphid, cotton red spider aphids can use imidacloprid, acetamiprid, etc.; red spider use avermectin and organophosphorus pesticides, half a mixed spray.
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