Which diseases and insect pests need to be controlled in summer corn seedling stage?

Which diseases and insect pests need to be controlled in summer corn seedling stage? Please introduce the control methods of summer corn seedling stage, there are the following diseases and insect pests need to be controlled: 1, seedling pest control corn seedling main pests are: armyworm, cotton bollworm, gray planthopper, thrips, Swedish flies and so on. To control armyworm and cotton bollworm, you can choose 5% cypermethrin, 2.5% cyhalothrin 50-75 g / mu, and spray 30 kg of water. For the prevention and control of Swedish flies, it is necessary to spray 15% chlorpyrifos EC 50 ml per mu at the beginning of corn emergence (that is, one leaf with one heart). If the damaged plants appear in the field, the seriously harmful plants should be pulled out in time, and the lightly harmful annular plants should be cut off. 50% phoxim EC 1000 ml / mu and 48% Lesben EC 200,400ml / mu can be used to control sunflower pink scale. 2. The main disease in seedling stage is maize rough dwarf disease. Rough shrinkage disease is transmitted by gray planthopper, so pest control and disease prevention should be done. To prevent virus disease, insecticides can be sprayed on weeds near the field before sowing or emergence, spraying with imidacloprid, spraying with 20% virus A wettable powder 500x liquid plus 10% imidacloprid 30g/ mu spray, spraying once in 7-10 days, 2-3 times in succession; in addition, agricultural control measures can be taken to remove diseased plants and retain healthy plants when seedlings are fixed. 3. Weed control: the edges, ridges and ditches where weeds have been unearthed and with high density before sowing can be sprayed with germicidal herbicides such as paraquat (paraquat) or glyphosate; soil treatment before seedling of corn after sowing can be treated with 40% ethyl A mixture 200 grams, or 50% isopropene atrazine 200 grams per mu, spraying 40-50 kg water. Corn seedling to 7-leaf stage, weeds 2-5-leaf stage, 4% nicosulfuron 90-100 grams per mu, spray 30-50 kg of water on stems and leaves, pay attention to corn seedling herbicides forbidden organophosphorus pesticides within 7 days before and after application, so as to avoid drug damage. Click to get more corn planting techniques click to get more food crop planting techniques