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Mythimna separata is an important pest of the world's gramineous plants, and all provinces and cities in China suffer harm. The larvae of the armyworm larvae are very miscellaneous, especially eating grassy plants. The harmful pastures include ryegrass, Sudan grass, Dactylis edulis, Setaria viridis, and crops such as wheat, corn and rice. The larvae bite the leaves, and the 1-2 instar larvae only eat the leaf flesh and form a small garden hole. After the third instar, the nicks are formed, and the 4-6 instars reach the gluttony period. When the damage is severe, the leaves are eaten and the plants form light stalks. Adults: 17-20 mm in length and 30-45 mm in pale grey-brown wings. There are two yellowish round spots on the near-front edge of the forewings, with a larger round spot on the outside and a small white point below it. There is a small black spot on both sides of the white spot. In the 1/3 of the trailing edge of the wing tip, there is a slanting dark brown pattern. From the 1/4 of the leading edge to the 1/3 of the trailing edge, there are 7 to 9 black dots arranged in an arc. The inside of the hind wing is gray-brown and brownish outwards. Eggs: Taro, about 0.6 mm in diameter, yellowish-white, with irregular reticular pattern on the surface. Larvae: larvae generally 6 instar, body length 17-20 mm, mature larvae about 38 mm, body color changes are larger, generally green to brown, body with black and white brown vertical lines 5, head brown To sepia, the valve is light brown and black.蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹 蛹Mythimna separata breeding (Southern provinces) 5-8 generations. The first generation egg period is 6-15 days, and the later generations are 3-6 days; the larval period is 14-28 days, the preceding flood season is 1-3 days, the flood season is 10-14 days, and the adult pre-spawning period is 3-7 days. Generation takes 40-50 days. Adults sleep at night and start activities, feeding, mating, and spawning in the evening. Each female can lay 1000-2000 eggs. The larvae have a total of 6 instars and have a pseudo dead nature. During the daytime in the potential grass, night activities harmed. Old mature larvae often degenerate in the grass and under the clods. Control methods: 1. Trapping killing moths: Take 1:1:4:16 sugar, wine, vinegar, water, and mix thoroughly with 1 part 2.5% trichlorfon powder. The lures were placed in pots and 2-3 pots per hectare. The pots were 30-35 cm above the forage and the depth of the lure was 3-3.5 cm. Cover the pots during the day and open the lids in the evening. Remove the dead moths every morning and use the attractant once every 5-7 days for 16-20 days. 2, moth picking eggs: from the beginning of spawning, until the end of the egg-filling period, the grass placed in the field, 150 per hectare, 3-5 days to replace once, the eggs with the straw collected and burned. 3, drug control: should be used for human and Animal safety, drugs on the short residue of herbage, no side effects of pesticides, such as 40% of the new Nongbao EC: 800 to 1200 times, 25% Kangzhuang suspoemulsion: 500 to 800 Times, 30% Horse Emulsion: 1000-1500 times, 90% Wanling Moisture: 1500-2000 times, 20% and State Water Emulsion: 1000-1200 times, 90% Trichlorfon 1000-1500 times Liquid Conventional Spray Wait. After medication for 15-20 days, herbage is harmless to livestock and poultry. 4, light trapping: In the grass is not undulating, less shelter, power, you can use the "frequency vibration type insecticidal lamp" to trap the adult. A lantern is installed every 40~60 mu. It is turned on in the evening and closed in the early morning.