How to control aphids in corn field?

How to control aphids in corn field? Please introduce the method of corn aphids commonly known as greasy worms and honey worms, which not only harm corn, but also harm sorghum, barley and other crops. It pierced and sucked plant sap, the number of aphids at seedling stage was very small, and the number of aphids at panicle stage increased sharply, secreting a large amount of "honeydew", forming a layer of black mildew on the leaves, affecting photosynthesis and reducing 1000-grain weight. The control methods are as follows: (1) Chemical control: use 5% methamidophos granules 200g per 667m2, mixed with fine sand or soil 1.5kg, spread 1 ridge every other ridge, fumigate and kill aphids; 0.5% dimethoate powder 667m2 spray 1500 times or 50% dimethoate EC 1500 times or 50% aldicarb powder 667m2 8g, spray 50kg water. (2) protect and utilize natural enemies, small black spiders and many ladybugs eat aphids. When you see these beneficial insects, do not spray pesticides or use 50% aldicarb, which does not harm these natural enemies. Click to get more corn planting techniques click to get more pesticide application techniques click to get more pesticide application techniques