Maize armyworm is one of the most common major pests of corn and has a considerable degree of damage to corn. Three generations generally occur in a year, and the second generation often attacks the summer corn. The larvae were destructively feeding on the corn leaves. When they were serious, all the leaves were eaten in a short period of time, resulting in serious reduction or even no harvest. Control methods: 1. Agricultural control: After corn emergence, corn should be ploughed and shredded in a timely manner to destroy the habitat of the corn armyworm and achieve the effect of reducing the source of insects. 2, artificial killing: After the corn grows leaves, sooner or later time is the high-feeding stage of larva feeding, artificial can kill larvae at this time. 3, physical control: According to adult mythimna separata with phototaxis, chemotaxis, the use of traps, insecticidal lamps and other pollution-free control technology to trap adult worms. 4. Chemical prevention and control: (1) To kill baits, use 100 ml of trichlorfon per acre plus even amount of water and 1.5 kilograms of sauteed bran to mix evenly to make bait for killing. (2) Foliar spray, 4.5% beta cypermethrin 50 ml 1500-2000 times, or 40% phoxim EC 1000 times evenly sprayed on the foliage. Fufeng Sinuote Biotechnology Co.,Ltd. , https://www.sntbiology.com