(used when meeting at night) Good evening.
The armyworm is also called shaving insect, multicolored insect, marching insect, gluttonous and omnivorous insect. In severe cases, corn seedlings are often eaten up overnight, resulting in lack of seedlings, broken ridges and even ploughing and replanting. Wind is also an important factor affecting the number of armyworms. When the migrating armyworm moth is forced to land in the wind and rain, the local armyworm will be seriously damaged.
Adult armyworms lie down during the day and come out at night. 1 and 2 nd instar larvae only eat mesophyll, and their food intake increases gradually after 3 years old. They often eat leaves into nicks. At the gluttony stage of 5 or 6 years old, they can eat all the leaves and bite off their ears, which is a cluster hazard. When it happens, they often eat up a crop and then move to nearby fields in droves.
Climatic conditions are particularly favorable for its growth and development, and the continuous reproduction of armyworm is easy to lead to the outbreak of armyworm.
Prevention and control methods. When the number of moths began to increase, sweet and sour wine was used to make traps for trapping and killing adults. The ratio of sweet and sour wine is 3: 4:1:2. Stir well and add a small amount of insecticide. Every 0.33~0.67 hectares, put a pot of attractant made of sweet and sour wine, the height of the pot is about 30 cm, and the depth of the attractant is about 3 cm. Take out the moth every morning, cover the pot during the day and open it at night. 1 time, 5~7 d, 2~3 weeks.
[smiling face] [cute]
2. Attract moths to kill eggs. From the prophase of adult oviposition to the end of oviposition, straw should be set in the field, about 10 per mu, and the straw should be slightly higher than the crops. Change the straw every 3~5 d, and burn the old one with eggs.
3. Pesticide control should be applied at the 3rd and 4th instars. The available chemicals are: 2.5% trichlorfon powder or 2% chlorfenapyr powder 1.5 ~ 2.5 kg powder per mu; Kill with 80% dichlorvos 1000 times, 50% phoxim 1000~ 1500 times and 20% pyrethroid 3000 times; Spraying 30 ~ 40ml of 90% fenthion, 25% carbaryl and 48% chlorpheniramine per mu. 1. The physical control strategy of pharmaceutical preparations adopts the following methods to trap and kill adults and reduce insect population: A, sweet and sour pots B, poplar branches &; #40; Adults hide in it during the day&; #4 1; C. Black light 2. Chemical control strategy in larval stage. The following chemicals can be selected for spray control: A, 5% chlorfluazuron EC 4000 times solution B, 5% chlorfluazuron EC 4000 times solution C, 5% chlorfluazuron EC 4000 times solution D, 20% chlorfluazuron 500- 1 suspension E or 25% fluorine. Or 2000-3000 times solution H of 40% Juma EC, or 2000-4000 times solution I of 20% fenvalerate, or 500 times solution of anisodamine pesticide.
4. Agricultural control: For the fields sown with hard stubble, shallow tillage should be carried out in time after the emergence of corn to destroy the habitat of corn armyworm and reduce the source of the insect. Artificial killing: after the emergence of corn, artificial killing is carried out in the morning and evening when the larvae feed.
By the way, I'll tell you the prevention methods for your reference, [smiling face] [cute]
Please comment if you are satisfied. Thank you.
Give it a pep talk &; #40; ⊙o⊙& amp； #4 1; Oh [smiling face]
It's Teacher Ma, thank you!