Verticillium wilt: Prevention is the key to the rapid occurrence of the cause of Verticillium wilt, serious losses, and difficulties in prevention and control. It is called cotton "cancer". Prevention and treatment of the disease should be based on strengthening field management. Through the selection of resistant varieties, adequate base fertilizers, early unveiling of membranes, early hardening of seedlings, early culturing and other measures to improve the disease resistance of cotton seedlings, at the same time, preventive medications should be properly controlled and timely controlled. The condition, especially after the rain, should be used immediately to prevent the disease from expanding. The agent may use trichloroisocyanuric acid, ethyl allicin, etc., once every 7 to 10 days, continuous control 2 to 3 times.
Blind observance: to seize the three key period of drug blind obstruction occurred 5 to 6 generations a year, the harm is widespread and serious, control must seize three key periods. The first period is in the middle or late May. When the cotton seedlings have 4 to 5 leaves, this is the peak period of the generation of the nymph larvae. The rate of the damaged plants in the field is 1% to 2% or 100 to 1 insects. Began to use drugs, focusing on insect field. The second period is the middle and early June. The cotton seedlings enter the budding stage. At this time, it is the second generation nymph hatching peak period. When the number of newly infected plants reaches more than 5% or 100 plants have 5 to 10 insects, the medicine is used. The third period is from the end of June to the beginning of July. This is the third generation nymph hatching peak period. The first generation and the second generation of blind stink bugs occur at the same time, so long as the medicine is used in a timely manner, the control effect is good. After three generations, the generation overlaps. With the strong growth of cotton and the sheltered fields, the control is difficult and the effect is significantly reduced. The prevention and control of blind stink bugs requires the use of drugs of different insecticidal mechanisms, such as the use of a highly contact-sensitive drug in combination with a drug with a strong absorption or fumigation effect. Usually, use 4.5% of beta-cypermethrin EC 20ml, 40% of chlorpyrifos EC 50ml, or 20% of high Chloride EC 75-100ml, or 40% of Omega 50ml plus 4.5% Cypermethrin EC 20ml , add water spray. As far as possible before and after 10 o'clock in the morning or around 5 o'clock in the afternoon, the blind monk is more active, mostly distributed in young cotton plants, the control effect is obvious. When spraying, first hit the periphery, turn around to play in the ring, and focus on annihilation, to prevent the migration of blind miracidia and control efficiency.
Cotton aphid: Alternating medicine effect is good Cotton aphid in the cotton field according to the time of occurrence can be divided into seedlings and Fuxi. Miao Miao occurred in the environment before emergence to adapt to the low temperature, Fuxi mainly occurred in late July to August, to adapt to the high temperature environment. Cotton aphids reproduce at high speed and in large quantities. Farmers often have poor efficacy in reflecting the use of pesticides in their production. This is mainly caused by single varieties of pesticides, insufficient water use, and uneven application of pesticides. Suitable for the treatment of cotton aphid drug imidacloprid, omethoate, acetamiprid, pymetrozine, nitenpyram and so on. Pay attention to alternate rotation of medication, appropriate increase water consumption, water consumption per mu in the 50 ~ 60 kg, when spraying the upper and lower plants, the front and back of the blade to spray evenly, penetrating through.
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