Mythimna separata is one of the main pests of corn. It belongs to Lepidoptera, Noctuidae, also known as the armyworm. Three generations of corn stickworms can occur each year, and the second generation is mainly responsible for summer corn. In general, high temperature and high humidity, low topography, uneven height of corn plants, and weedy fields are heavy. Symptoms of damage are mainly larvae that eat leaves. The 1 to 2 instar larvae feed on the leaves to cause holes, and the larvae above 3 instars show irregular nicks when they invade the leaves. When the gluttony eats, they can eat the leaves. In the great event, the leaves of the corn were eaten, leaving only the leaves and veins, resulting in serious reductions in production and even in nowhere.

Prevention

Agricultural control One is to remove corn stalks from the field and use it as a fuel or stacking compost to kill insects that lurk in the culms. Rational rotation, not continuous cropping, shallow ploughing, reducing the base number of adults; second, artificial killing and cultivating weeds to eliminate larvae, in the emergence period of armyworm larvae, weeds and larvae can be used to turn weeds and larvae under the soil to kill larvae. It also reduced the humidity in the field and increased larval mortality.

One of the biological control is the release of Trichogramma beetle, the use of natural enemies to prevent and control; the second is the application of biological pesticide Beauveria bassiana control, can significantly reduce the damage.

One of the physical controls is trapping and killing adults. Using adult phototaxis with blue light traps; sweet and sour liquids trap and kill adults, attracting liquor, water, sugar, vinegar in a ratio of 1:2:3:4, adding a small amount of trichlorfon and putting the liquid into pots Every evening in the evening, 1 meter away from the field, the next morning, retrieve the pot and cover it to prevent evaporation. 2-3 days plus a lure, 5 days for a lure. The second is the grass to lure eggs. Bind the grass loosely into small pieces, insert it in the corn field, above the plants, change it for 5-7 days, replace the grass handle to burn, and spray the sweet and sour liquid on the grass handle better. Every nectar, egg vinegar pots, straw grass nearby, spray once every 7 days, the eggs hatched larvae to kill.

Chemical control Chemical control is mainly to master the application time. Because the greater the age of the armyworm larvae is, the stronger its drug resistance is. According to the study, 5 and 6 instar larvae are 10 times more resistant than 2, 3 instar larvae. Therefore, we must grasp the prevention and control of larvae in the younger age in order to obtain better control effects. Early detection, early prevention and control, try to control the corn stickworm before the third instar. The prevention and treatment time generally chooses the time of feeding of the early and late larvae for feeding; the spraying site should be applied as far as possible to the corn heart and leaves.

Bait baiting: Mu with 90% trichlorfon 100 grams against the amount of water, mixed in 1.5 kg of bran fried bacon made of bait, in the early evening along the corn line to spread, seduce.

Foliar Spray: Use a 4.5% beta-cypermethrin EC 40 ml/mu or 48% Chlorpyrifos 50 ml/Mu field spray.

Sprinkle poisonous soil: Mu with 40% phoxim EC 75-100 g amount of water, mixed with 40-50 kg of sand soil in the heart of the Yeonza, you can protect the natural enemies, but also prevent corn borer.

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