The use of chemical pesticides to control cotton pests and diseases must grasp the appropriate dosage. If the dosage is too large, it will easily cause phytotoxicity to cotton; if the dosage is too small, the control effect will not be achieved. Therefore, the use of chemical agents to control pests and diseases of cotton (including other crops) must use appropriate control doses.
Cotton blight can be controlled by 40% carbendazim or 65% mancozeb wettable powder 500~800 times liquid foliar spray.
In the early stage of cotton verticillium wilt, 40% carbendazim 1000 times solution can be used for root irrigation (0.5 kg/plant), or fulvic acid 500 times solution plus anti-death 500 times mixed spray.
Cotton red leaf stem blight in the early stage of the disease, can be sprayed with 2% potassium dihydrogen phosphate or potassium chloride aqueous solution, sprayed every 7 days, even spray 2 to 3 times, can reduce the occurrence of red leaf stem blight.
When the rate of cotton aphid leaf stalks reaches 5%~10%, it is controlled. Use 25% oxazolidine emulsifiable concentrate 1000~1500 times solution, 4.5% high-speed cyhalothrin 1000~2000 times solution, 50% profenofos 1000~1500 times solution, 10% imidacloprid wettable powder 2000~3000 times solution spray.
Helicoverpa armigera, the third generation of cotton bollworm, 15 young larvae, and the fourth generation of cotton bollworm, 100 young larvae, 8 to 10 heads were controlled. Use 35% endosulfan emulsifiable concentrate 1000~1500 times solution, 20% metovyl emulsifiable concentrate 1500~2000 times solution, 2.5% cypermethrin emulsifiable concentrate 1000 times solution, 50% propyl bromide emulsifiable concentrate 1000~1500 times solution, 2.5% bromine cyanide Pyrethroid emulsifiable concentrate 1000 times spray control.
Cotton leafhopper (red spider) 10% strong Liuyangmycin EC 1500~2000 times solution, 20% broom net cream 1000 times solution, 20% ketone ketone 2000 times solution, 1.8% avermectin (worm) ) Emulsified oil 1500~2000 times liquid can be evenly sprayed.
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