How to control the corn armyworm?

How to control corn armyworm? What is corn armyworm? What pesticide does corn armyworm use to hit? Please give an introduction Corn armyworm, also known as colorful insect, feeding miscellaneous, adults day and night out, mostly in the middle and lower part of the yellow leaf tip, leaf sheath eggs, single female eggs 1000-2000. Larvae are active in the morning and evening, that is, from sunrise to 10 o 'clock in the morning and around evening. Loves gramineous crops and weeds, food intake increases by age, five to six instars for gluttony stage, with the characteristics of cluster harm, gluttony, omnivorous, larvae often cluster migration harm, so also known as "army worm". The first and second instar larvae only nibble the mesophyll into skylight, and after the third instar they nibble along the leaf edge into notch. When the damage is serious, they eat the bright leaves and only leave a short midvein. Startled larvae have the habit of suspended animation and diving into the ground. Corn armyworm bites leaf tissue, forming a gap, often eating all leaves, leaving only bare fruit, extracted corn ears can also be bitten off, can damage more than 100 kinds of plants, migration, gluttony strong, is classified as one of the national major agricultural pests, serious damage can cause yield reduction or no yield. Corn sticky is a kind of pest that likes humidity and is afraid of high temperature and drought, but excessive rainfall, especially heavy rain or storm attack, the number of armyworms often drops significantly. Corn armyworm control methods: 1. Prevention and control of adults and reduction of oviposition: using the oviposition habit, phototaxis and chemotaxis of armyworm adults, using millet straw, sweet and sour liquid, sex traps and insecticidal lamps to trap adults to reduce the number of eggs laid by adults and reduce the density of insects in the field. 1. Grain grass to put the law. Generally tie grass handles with a diameter of 5 cm, insert 60-100 per mu, change the grass handles once every 5 days, and burn the replaced withered grass handles intensively to eliminate adult armyworms. 2. Sweet and sour. 350g brown sugar, 150g wine, 500g vinegar, 250g water and 15g 90% crystal trichlorfon were taken to prepare sweet and sour liquid, which was put in the field at a height of 1 meter to trap and kill adult armyworm. 3. Sexual entrapment. A dry lure equipped with a sex lure core for armyworm was used to trap and kill oviposition adults by hanging one stem per mu in corn field. 4. Insecticide lamp method. During the mating and spawning period of adults, insecticidal lamps were placed in the field with intervals of 100 meters. Lights were turned on from 8 p.m. to 5 a.m. to trap adults. Second, control larvae, reduce harm: timely spraying control in the early stage of larval occurrence, and eliminate larvae before the third instar. 1. Control standards. When the insect population density in rice field reaches 25-30 heads/square meter and the insect population density in corn field reaches 30 heads/100 plants or more, 50% phoxim emulsifiable concentrate, 80% dichlorvos emulsifiable concentrate, 40% chlorpyrifos emulsifiable concentrate, 75- 100g water 50kg or 20% chlorfenuron No. 3 suspension or 25% cypermethrin emulsifiable concentrate 20- 30ml or 4.5% beta-cypermethrin 50ml water 30kg can be sprayed evenly in each mu. Or spray 5% fenpropathrin EC, 5% fenvalerate EC, 2.5% beta-cyhalothrin EC, 2.5% deltamethrin EC 1000-1500 times, 40% omethoate 1500-2000 times, 10% imidacloprid 2000-2500 times. 2. Early prevention. The larvae of armyworm can be controlled by spraying 4000 times solution of 5% Cassik emulsifiable concentrate, 500-1000 times solution of chlorfenuron No. 1, chlorfenuron No. 2 or chlorfenuron No. 3. The effect of controlling armyworm larvae is good, and it does not kill natural enemies. 3. Sprinkle poisonous soil: mu with 40% phoxim emulsifiable concentrate 75-100 grams of water, mixed with sand 40-50 kg scattered in the corn heart leaves, you can protect natural enemies, but also can prevent corn borer. Click for more corn growing technology Click for more food crop growing technology