The period from emergence to budding is the seedling period, which lasts for about 40-45 days. During this period, because the temperature is still low, the seedlings are tender and small, and the disease resistance is weak. They are vulnerable to damage caused by diseases and insect pests and cause seedlings to break ridges, or impede the growth of cotton and affect the early growth of strong seedlings. The main diseases in this period include blight, anthrax, and cotton blight. The pests mainly include small tigers, cotton grasshoppers, cotton leafhoppers, cotton-lipped stink bugs, and thrips.
First, disease prevention and control. After the cotton seedlings are unearthed, they should be cultivated as early as possible and cultivated in order to raise the ground temperature, loosen the soil, promote the growth of roots and plants, and reduce the occurrence of seedling diseases. 50% Carbendazim WP 500-800 times, or 18% copper rosinate emulsion 700 times or 75% thiophanate-methyl WP 800-1000 times spray at the onset of blight and anthrax Conduct prevention and control, spray once every 7 days, and spray 2-3 times. At the early stage of the onset of cotton blight, 58% metalaxyl MnZn WP or 70% MX WP wettable powder 600-800 times liquid spray can be used for prevention and treatment every 5 days for 3-4 times.
Second, pest control. Prevention and control of small tigers use 40% phoxim EC 500-800 times liquid irrigation root or mu 3% phoxim granules 2-3 kg mixed fine soil 20 kg applied in combination with watering prevention.
When cotton seedlings have a leaf rolling rate of 10% before the three-leaf stage and the leaf rolling rate reaches 20% after the four-leaf stage, the cotton shoot seedlings are immediately treated and used, and 10% imidacloprid wettable powder 2000 times or 3% acetamiprid can be used. Wet powder 3500-4000 times plus appropriate amount of silicone additives spray for prevention.
Prevention and control of cotton leafhoppers 1.8% avermectin or 20% of Fuling EC 2000 times plus appropriate amount of silicone additives spray for prevention and treatment.
In the field where cotton aphids occur, the infected plant rate will reach 2% to 3%. When one hundred plants have nymphs or nymphs, they should be treated immediately with medicine. Acres with 1% Emamectin EC 50 ml, or 4.5% Beta-cypermethrin EC 40 ml + 40% Chlorpyrifos EC 60 ml, or Malathion EC 30 kg of water plus appropriate silicone additives Prevention.
For control of cotton thrips, 50% phoxim EC 1 kg and 25-50 kg water 100 kg before sowing can effectively control seedlings Thrips. After the seedlings, there are 15-30 insects or 3 true leaves, 10 insects, 10 true leaves, 100 insects, and 20-30 insects. The following agents can be used to control 50% phoxim EC 1500 times, or 25% pymetrozine wettable powder 1500 times, or 1.8% abamectin EC 2000-4000 times, or 70% imidacloprid wettable powder 1500-2000 times.
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