Prevention and treatment of cotton in the middle and late stages of pests and diseases
The overall occurrence of cotton pests in the middle and later stages is heavier than the previous period. Experts pointed out that the insect pests that cause harm to cotton in the middle and late stages are mainly cotton bollworm, cotton blind locust and aphid. The estimated area is 1.7 million mu; the main diseases of the disease are yellow. Wilt disease is expected to have an area of ​​30 million mu. In addition, potato late blight also entered its peak period, and it has performed more severely in most parts of northern China. It is estimated that the affected area will reach 20 million mu. Preventing diseases and pests of autumn crops is imminent, and the reporter interviewed Zhang Mingke, an associate researcher at the College of Horticulture at the Northwest A&F University. He said that taking measures against pests and diseases is an important guarantee for winning the autumn crops' stable production and security.
Prevention and treatment of middle and late cotton diseases and insect pests
Agricultural control In order to effectively control the damage of the bollworm, the species of the bollworm should be selected at the time of selection, and the top heart and side of the eggs with insects should be removed timely and taken out of the field for destruction. Zhang Mingke said that the prevention and treatment of cotton blind lynx should avoid cotton blind crops, such as beans and vegetables, around the cotton fields. And strengthen scientific management, do a good job of pruning and chemical control, prevention and treatment of cotton growth is too prosperous, chemical control is not timely and the shade caused by the field, to provide a suitable living environment for the occurrence of cotton lupeh.
When chemical control is used to control drugs, it is necessary to alternately use drugs. For this, Zhang Mingke stated that it is possible to select eggs, insecticides, worms, and worms to kill eggs, and use trichlorfon, dichlorvos, cypermethrin, and kangfutong for prevention and control. Larvae and adults, while using 25% fast killing 2nd, 20% Le Chloride EC. Zhang Mingke said that spraying time should be selected before 11 am or after 3 pm. The lush foliage and tall planted cotton fields should be appropriately increased in dosage. After the application, heavy rain should be encountered. Anti-cotton Blindness can use organic phosphorus pesticides, such as 55% malathion per acre 75 ml, watering 75 kg sprayed. In addition, by using the phototaxis of cotton blind locusts, adults can be trapped and killed in the cotton field. The control of aphids can use special acaricides, such as imidacloprid, acetamiprid and other low-toxic high-efficiency pesticides for prevention and treatment. Zhang Mingke said that it is not possible to blindly use large areas of medicine. When spraying, it must be meticulous and thoughtful. In particular, the back of the leaf should be focused on prevention and control. When spraying, large amounts of water and low concentrations should be used, and the water consumption per mu should be above 30 kg.
For Verticillium dahliae, Zhang Mingke suggested that 70% thiophanate-methyl 500-1500 times solution or carbendazim 1000 times solution to root, 70% of the control effect can be obtained, to promote the recovery of the diseased plants, are obvious effect. Foliar spray of 0.3% potassium dihydrogen phosphate or 1% ~ 1.5% urea solution, can enhance plant resistance, reduce hazards.
Prevention and treatment of middle and late cotton diseases and insect pests
Agricultural control In order to effectively control the damage of the bollworm, the species of the bollworm should be selected at the time of selection, and the top heart and side of the eggs with insects should be removed timely and taken out of the field for destruction. Zhang Mingke said that the prevention and treatment of cotton blind lynx should avoid cotton blind crops, such as beans and vegetables, around the cotton fields. And strengthen scientific management, do a good job of pruning and chemical control, prevention and treatment of cotton growth is too prosperous, chemical control is not timely and the shade caused by the field, to provide a suitable living environment for the occurrence of cotton lupeh.
When chemical control is used to control drugs, it is necessary to alternately use drugs. For this, Zhang Mingke stated that it is possible to select eggs, insecticides, worms, and worms to kill eggs, and use trichlorfon, dichlorvos, cypermethrin, and kangfutong for prevention and control. Larvae and adults, while using 25% fast killing 2nd, 20% Le Chloride EC. Zhang Mingke said that spraying time should be selected before 11 am or after 3 pm. The lush foliage and tall planted cotton fields should be appropriately increased in dosage. After the application, heavy rain should be encountered. Anti-cotton Blindness can use organic phosphorus pesticides, such as 55% malathion per acre 75 ml, watering 75 kg sprayed. In addition, by using the phototaxis of cotton blind locusts, adults can be trapped and killed in the cotton field. The control of aphids can use special acaricides, such as imidacloprid, acetamiprid and other low-toxic high-efficiency pesticides for prevention and treatment. Zhang Mingke said that it is not possible to blindly use large areas of medicine. When spraying, it must be meticulous and thoughtful. In particular, the back of the leaf should be focused on prevention and control. When spraying, large amounts of water and low concentrations should be used, and the water consumption per mu should be above 30 kg.
For Verticillium dahliae, Zhang Mingke suggested that 70% thiophanate-methyl 500-1500 times solution or carbendazim 1000 times solution to root, 70% of the control effect can be obtained, to promote the recovery of the diseased plants, are obvious effect. Foliar spray of 0.3% potassium dihydrogen phosphate or 1% ~ 1.5% urea solution, can enhance plant resistance, reduce hazards.
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