What are the pests of stored corn?

Corn in storage, easy to be damaged by stored grain pests, common damage to corn storage grain pests there are more than 40, mainly lepidoptera (moths) and coleoptera (beetles) two categories, as well as mites.

Common Coleoptera; Corn elephant, red grain thief, miscellaneous grain thief, saw grain thief, large grain thief, book lice.

Mealworms, black mealworms, black fungus insects, rice flatworms, rice elephants, grain elephants, tobacco beetles.

Medicinal herb nails, spine and chest exposed tail beetles, wet salary beetles, barefoot Guo Gong insects, cockroaches.

Moths: corn borer, wheat moth, little grain moth, Indian grain moth, pink spotted borer, etc.

First of all, the newly harvested corn should be kept dry and low humidity conditions, and can be fully exposed to the sun and dried, which is the main measure for long-term safe storage of corn. If the moisture can not be reduced to the summer standard, you can take advantage of the warm spring exposure, seal the warehouse after cooling, scatter and seal, and do a good job of moisture-proof and moisture-proof insulation to safely spend the summer.

For corn that has been fully dried in winter, it can be closed and capped while it is cold in winter, which has a good effect on safe summer. If the newly harvested corn fails to dry in time, it is necessary to do a good job of anti-freezing after winter. Frozen corn is of poor quality and difficult to store.

The second is the prevention and control of pests and diseases, the corn that has been insects can be controlled by sieving or drug fumigation, and the plastic cloth can be sealed to create an anoxic environment, which is not only insect-proof, but also moisture-proof and mildew-proof. For corn that has been insected, it can be sieved to remove insects, or fumigated with aluminum phosphide to remove insects.

What are the pests when planting corn? There are many pests in the life of corn, and there are as many as 35 kinds of research reports at present, but the production is often occurring and the damage is more serious, mainly including fall armyworm, corn borer, thrips, aphids, underground pests, Spodoptera exigua, armyworm and other pests. At present, the prevention and control of corn pests is mainly based on chemical control, timely physical control and biological control, etc., which can effectively prevent the occurrence of pest damage.

At present, the common and better chemical agents in production are, fall armyworm is selected with 60 ml of 5% lice mite urea per mu, which has a good control effect on eggs and larvae, and can also be sprayed with 50 ml of 15% emamectin salt fenfenapyr per mu or 15 ml of 20% chlorantraniliprole in the peak period of young larvae. Corn borer is generally used in the bell mouth period with 3-4 catties of 5% chlorpyrifos or 3% phosphine granules to lose their hearts for control, and more than 50 larvae of 100 larvae can be sprayed with 50-70 ml of emamectin salt, or 30 ml of 5% high chlorine spray control.

When armyworm occurs, the agent used to control fall armyworm is used for control, and the effect is also better. For corn aphids, 3-4 grams of 70% imidacloprid per mu, or 16-20 grams of 50% pymetrozine per mu, and thrips in addition to spraying imidacloprid control, can generally use 50-60 ml of 50% dimethoate per mu, which has a good effect on aphid mites. For Spodoptera exigua, 10% cyhalothrin microcapsules can be sprayed, which can not only trap and kill pests in the soil, but also spray pesticides on the soil surface and kill insects under the soil.

In addition, before corn sowing, the selection of phosphine, or chlorpyrifos or fipronil and other agents for seed dressing, underground pests, thrips, aphids, Spodoptera exigua, etc. have a good culling and control effect, and fall armyworm with deltatraniliprole thiamethoxam seed dressing effect is the best. In short, there are many types of corn pests, and there are many control methods, which should be scientifically controlled according to the local pest occurrence species and control methods.

Corn aphids, thrips, corn borers, corn bollworms, corn armyworms, Spodoptera litura, these are all pests that occur during corn planting.

There are pests and diseases of scab, powdery mildew, rust, wilt and sheath blight. And these insect pests have a great impact on corn.

Corn aphids, corn borers, thrips, noctuidae excidaes, underground pests, these are the more common insect pests.

The underground pests that cause damage to corn seedlings include "Spodoptera exigua" (larvae), ground tigers, grubs, needleworms, root bugs, Spodoptera exigua, etc., because the subject did not provide **, only comprehensive control skills can be proposed. Prevention and control method-1 sprinkle poisoned soil. Mu with 500 ml of 80% dichlorvos emulsifiable concentrate, mixed with 25 kg of fine soil, sprinkled along the ridge in the evening on the roots of corn seedlings.

2. Root spraying. Use 2500 times of high-efficiency cyfluthrin emulsifiable concentrate. or 30% acemethamidophos emulsifiable concentrate 1000 times liquid.

<> when buying seeds, you can choose coated seeds for planting, and coated seeds are generally coated with phosphine or imidacloprid, which can prevent underground pests from eating corn seeds. The seeds purchased now are generally coated, and if you don't have them, you can buy a potional for seed dressing. Prevention and control methods:

Irrigation solution, 50% phosphine emulsifiable concentrate per hectare, 750 kg of water along the ridge. It can also be sprayed with 10% imidacloprid wettable powder 3000 times.

Seed dressing, when corn sowing, the seed coating agent is used to dress corn seeds to control underground pests and damage corn seeds. Commonly used pesticides include grassworm line, carbofuran, chlorpyrifos and other pesticides. The number of generations of corn borer occurs every year, and 6 or 7 generations occur in our province a year, and the adult corn borer emergence time is mostly before dawn.

After feathering, mating is carried out in the evening of the same day, and spawning begins the next day, and the spawning time is mostly in the first half of the night. Female moths generally lay eggs for 4 to 5 nights, laying 4 20 eggs.

To prevent and control the harm of corn borer, 1-2 kg of 3% Guangxidan granules can be used per mu, or 1-2 grams of cyanuric fluorochloride granules, 1-2 grams of 14% chlorpyrifos granules, 2 grams of 3% phoxanthion granules, and 1-2 grams of 3% butylsulfur carbofuran granules, sprinkled in the heart leaves. For thrips, straw flies.

3. Corn heartworms, armyworms, planthoppers, leafhoppers, blind bugs, red spiders and other pests should be sprayed after corn emergence, and the first leaf can be sprayed seven or eight days after sowing. Be sure to spray the whole field, not just the corn ridge.

The main pests of <> corn seedling stage are thrips, corn heartworm, wheat straw fly three generations, wheat straw fly four generations, armyworm planthopper, leafhopper, blind bug mite, red spider and other pests. Although corn will be harmed by more pests when it is in the seedling stage, the occurrence time of these pests is generally more concentrated, because its damage time is relatively short, and the damage can be reduced as long as the protection work is done in time.

In the process of corn planting, diseases, insects and weeds often appear, which seriously threatens the quality and yield of corn! So, what are the corn pests and diseases and what is the best medicine for corn with borers? Let's find out together.

What are the corn diseases and pestsThere are corn diseases and pests, such as corn borer, armyworm, cotton bollworm, aphid, corn leaf mite, etc.

1. Corn borer: Corn borer, commonly known as borerworm, belongs to Lepidoptera and Moth family, and is the main insect pest of corn.

It can harm all parts of the ground of corn plants.

Corn borer generally occurs in 2-4 generations a year, with high temperature and low altitude, and more generations.

Adults are nocturnal, have strong flying ability, phototaxis, have a lifespan of 5-10 days, and like to lay eggs on both sides of the midrib on the back of corn leaves that are more than 50 cm above the ground and grow more luxuriantly.

After the larvae hatch, they gather together at first, and then crawl on the young part of the plant and begin to harm.

The newly hatched larvae can spin silk and droop, and float down to neighboring plants by the wind, forming a plant transfer hazard.

2. Armyworm: Armyworm is commonly known as colorful insect and wheat silkworm, and belongs to the family Spodoptera exigua.

It is the main pest of grain crops and pasture crops, and seriously harms corn.

Armyworms are polyphagous, migratory, and fulminant pests.

The occurrence of armyworms is closely related to temperature and humidity.

Generally, the appropriate temperature for adult oviposition is 19-25, and the oviposition above 30 is affected.

In addition, the higher the humidity, the more conducive to the adult egg-laying, especially in the climate conditions of cloudy and sunny staggered, rainy and high humidity, the group base is not only conducive to the egg-laying of the adult, but also conducive to the hatching of eggs and the survival and development of larvae.

3. Cotton bollworm: belongs to the order Lepidoptera and Noctuidae.

Also known as drillworm, green worm, cotton boll armyworm, etc.

4. Corn aphids: can harm a variety of gramineous crops and weeds.

At the seedling stage, adult aphids and aphids are harmed by clustering in the heart leaves, and after heading, they harm the panicle, absorb sap, hinder growth, and can also spread a variety of gramineous cereal viruses.

Its secretions stick to the pollen and affect the loose pollen.

In addition, it can also spread corn dwarf mosaic virus disease, resulting in varying degrees of yield reduction.

5. Corn leaf mites: commonly known as red spiders, can harm a variety of crops, with adult mites and mites sucking the sap of the dorsal tissue of the host leaves, the damaged leaves turn from yellow to white and die, affecting the corn filling process, resulting in a decrease in 1000-grain weight and a decrease in yield.

What is the best medicine for corn to have borers 1, kill overwintering larvae.

In the early stage of pupation of larvae after winter of corn borer, treatment of straw (firewood) to reduce the source of insects and reduce the number of pupation emergence.

2. Exterminate adult insects.

Because the corn borer adults are active at night and have strong phototaxis, they can be set up with frequency vibration insecticidal lamps, black lights, high-pressure mercury lamps, etc. to trap and kill corn borer adults, generally in late May to start trapping and end at the end of July, the sun sets at night and turns on the light, and the sun comes out in the morning to close the light.

This traps not only the adult corn borer, but also all phototaxis pests.

3. Insecticidal eggs.

The red-eyed bee eggs are parasitic in the eggs of the corn borer to absorb its nutrients, resulting in the death of the corn borer eggs and the hatching of the red-eyed bee.

4. Kill field larvae. Sell companions.

Homemade granules can be sprinkled into the corn heart leaves to kill corn borer larvae.

Common corn pests and diseases are corn borer, armyworm, cotton bollworm, aphid, corn leaf mite, etc., the use of cyhalothrin 2000-2500 times liquid spraying plants, can control corn borer and other lepidopteran pests.