Corn armyworm is one of the common pests in corn crop pests, how to control corn armyworm?

Corn armyworm control methods: biological control, chemical control, drone control. Chemical pesticide control, when armyworm larvae are found, spray fast-acting insecticides in time, spray the medicine to the position where armyworms inhabit activities, and spray mixed insecticides alternately.

Armyworm is a migratory pest, and the ground control space is limited, while the drone spraying can be unrestricted and can keep up with the speed of pest migration.

It is necessary to grasp the insect monitoring and early warning information issued by the local plant protection department in a timely manner, so as to achieve early detection and early control, and try to control the corn armyworm before the third instar. The control time is generally selected in the morning and evening when the larvae feed at high frequency; The spraying site should be applied to the corn heart leaf as much as possible.

How to prevent insects in corn and what is the best agent to use?

I don't know if the subject is talking about spring corn or summer corn, corn faces about the same insect pests, which is determined by temperature.

First of all, in the 3 to 6 leaf stage, mainly small ground tigers, harm the stem base of corn, or the root system, resulting in lack of seedlings and broken ridges, the solution can be mixed in advance, such as Lu Mingwei, Ruisheng, Fuliang can be, you can also spray pesticides at the seedling stage for prevention, such as cyhalothrin, emamectin salt! Choose a very strong systemic agent, there is a 6 leaves after the main corn borer, borer, the new leaves of corn is very harmful, can be prevented in advance, like Kangkuan, Fugo, emamon carpyr, must choose a long effective period, control to increase labor costs, control and green worm must be as early as possible, to avoid causing greater harm. At this time, you should also pay attention to the harm of thrips, and you can choose a farm boat like a silver farmer to avoid further spread of rough shrinkage.

Corn armyworm generally occurs when corn is about to mature, that is, every year.

June and July.

Once it happens, you can spray insecticides, which have a good treatment effect.

Generally, the seedling stage and heading stage are the outbreak period, and the dimethoate, trichlorfon, armyworm control agents, butylthiochlorbin, phosphine, and diaformamidine alone control armyworm are in order of high to low, and the order of phosphine is greater than butylthio, carbofuran is greater than that of the thyroid gland. It is also possible to mix carbofuran butylthion with phoxanthion at a ratio of 1:4.

Generally, in late June, the temperature is higher, the precipitation is more, and the air humidity is high, which is conducive to the development and reproduction of pests.

Prevention and control: 1. Use black light or sweet and sour liquid to trap and kill adult insects; 2. Alternate spraying with cypermethrin, phosphine, chlorpyrifos, etc. Spray once every 7 to 10 days, spray 2 to 3 times.

According to the above activity rules of corn armyworm, it is advisable to spray pesticides around the evening. Because of the use of medicine at this time, the sunlight is not strong, and it is close to the evening, the liquid sprayed on the corn surface is not easy to lose, and the corn armyworm can be poisoned immediately after the corn armyworm comes out in the evening.

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Corn armyworm is generally eared in corn, and in the late pollination period, moths will lay eggs on corn ears, and after 7-10 days, they will metamorphose into larvae, so the control of corn armyworm should be sprayed with insecticides during the pollination period.

Corn armyworm generally occurs at the seedling stage of corn, and you can't wait until a large-scale outbreak to think about control, then it's too late. Therefore, it is necessary to prevent and control in advance, and can be sprayed at the corn seedling stage to increase yield**, there are specific insecticides, in addition, it can also prevent diseases and increase yield.

<>1. The larvae will gnaw on the corn leaves, and in severe cases, they will gnaw away the leaves -During the 2nd instar larval period, they will gnaw holes in the leaves, and the larvae above the 3rd instar will gnaw on the leaves. 3. When a large-scale outbreak of insect pests occurs, the leaves will be gnawed away, leaving only the leaf veins.

4. After eating a corn field, the insect will migrate to the nearby field in a swarm and continue to cause damage. 5. In the fields with low terrain and uneven height of corn plants, the damage is heavier.

1. The harm of corn armyworm

1. The larvae of corn armyworm will overeat corn leaves, and when the insect pest is serious, it will eat up the leaves in a short period of time, resulting in reduced crop yield or even no harvest.

2. Corn armyworm will feed on the leaves to cause holes in the 1-2 instar larval period, and the larvae above the 3rd instar will show irregular notches on the leaves after harming the leaves, and can eat up the leaves when they are overeating.

3. When there is a large-scale outbreak of corn armyworm, the corn leaves can be eaten up, leaving only the leaf veins, resulting in a serious reduction in crop yield or even no harvest.

4. When a field of corn is eaten, the larvae often move to another field in groups, so the corn armyworm is also called "marching worm".

5. Generally, in the fields with low terrain, uneven corn plants and overgrown weeds, the insect pests are more serious.

Second, the control method of corn armyworm

1. Trap and kill adult insects, attract eggs and collect eggs.

1) During the occurrence of adult corn armyworms, food trapping, concealment trapping and light trapping should be carried out with booby trapping pots, black lights and other tools according to local conditions, and they should be eliminated before the adults lay eggs.

2) When the adult first lays eggs, use the grain grass and poisonous weed to trap eggs in a large area and kill the eggs, and use the armyworm to lay eggs in the habit of laying eggs in the yellow part of the moth to lay eggs, and the grass will be changed once every 3 days, and the livestock will be burned or fed intensively.

2. Apply pesticides in a timely manner to eliminate larvae.

1) An important means of controlling armyworm is chemical control, which can use 80 dichlorvos emulsifiable concentrate 1000-1500 times, 25 menadicarb aqueous agent 500 times, 25 insecticidal aqueous agent 500-800 times liquid and other agents, about 225-300 ml per hectare, diluted with water 3000-4000 times, and then carried out conventional spraying, which can kill insects.

2) The larvae can also be controlled by spraying powder, with trichlorfon powder per hectare, and the control effect can reach more than 80. If there is a plot of sorghum nearby, use this method with caution.

3) When using chemicals to control pests, it is necessary to grasp the timing of control, try to apply pesticides before the larvae 3-4 years old, and the application speed should be fast.

Insecticide: 50% phosphine EC 10 ml; 15 g of 70% thiamethoxam dispersible granules; 30 g of 70% imidacloprid wettable powder.

Phosphine EC and dimethoate EC can control corn armyworm.

The control of corn armyworm can be done with imidacloprid or acetamiprid.

The main control agents of corn armyworm are emamectloid, mite urea, chlorantraniliprole, etc.

Corn armyworm is mainly controlled with phoxanthion emulsifiable concentrate, imidacloprid wettable powder, acetamiprid, etc.

The control of corn armyworm is done with imidacloprid or acetamiprid and thiamethoxam.

There are mainly imidacloprid and lake insect squint control.

Corn armyworm is very good to control, the key is to use the drug effect in the young larval stage, cypermethrin, cyhalothrin, emamectin salt, acetamiprid and other pesticides.

Control method: Adults have strong flight ability, phototaxis, and can use light to trap and kill adults. Use the chemotaxis of adults to sweet and sour solution to trap and kill adults. You can put sugar, vinegar, liquor, and water by pressing 2:

It is mixed in a ratio of 2:1:2 and prepared by adding a small amount of dichlorvos liquid at the same time.

During the larval damage period, 20% pyrethrin EC 3000 times or 80% pyrethrin 8000 times can be sprayed for control. When the insect age is older, spray 1000 times of 50% phoxanthion EC or 1500 times of 20% quick-kill butadiene EC. The spraying time should be carried out after 3 p.m.

Corn armyworm can be controlled with pyrethroid pesticides such as cypermethrin.

It can be controlled with cypermethrin, emamectin benzoate and phosphine emulsifiable concentrate.

The difference between corn armyworm and bai corn borer is as follows

Morphology: Yuzhi rice dao armyworm is a short strip of hairy back caterpillar morphology, as shown in the figure below, corn borer has wings, tiger stripes, color, can fly, the two are obviously different.

Corn borer: also known as corn borer, belongs to the order Lepidoptera, moth family.

Corn armyworm: also known as marching bug, body length 17 20 mm, pale grayish-brown or yellowish-brown, male moth darker.