What are the pests and diseases at the corn seedling stage, and what drugs are used for the insect p

The main diseases at the seedling stage of maize are cataplexy, seedling blight and root rot caused by Pythium and Fusarium beads. For the prevention and treatment of cataplexy, you can use 10% Shileshi water solution or 5% Genbao 50 100ml mixed with 50 kg of corn seeds; When the seedlings are found wilted or wilted, 500 800 times of Pulik water solution, 500 times of 58% Redomir manganese zinc wettable powder or 600 times of 72% Kelu wettable powder can be sprayed. To prevent and control seedling blight, you can use 100 grams of 50% phosphine plus 2 kg of water to mix 50 kg of corn, stack for 4 6 hours, dry slightly and mix 100 grams of 50% carbendazim for sowing; It can also be controlled with 10% aphid lice plus cypermethrin plus 70% methyl tobuzin 800 times.

To prevent and control viral diseases, in the early stage of the disease, spray with a mixture of 20% virus buster 500 times liquid and green leaf treasure 400 500 times liquid to have a certain effect, and at the same time use 50% aphid fog wettable powder 2500 times liquid spray to prevent and control aphids and gray planthoppers and other poisonous pests.

In addition, for the prevention and control of large spot disease, spray with 600 times of 40% gram blast powder or 70% mancozeb wettable powder. For the prevention and treatment of small spot disease, spray with 50% carbendazim wettable powder 500 times or 70% methyl tobuzin wettable powder 500 times. Foliar spraying of zinc sulfate at the 4 5 leaf stage of maize can prevent and control zinc deficiency and enhance plant disease resistance.

1. Corn seeds rot.

The disease is easy to prevent and difficult to treat, seed coating is the best control measure, there is no effective rescue measure after the occurrence, and the serious field is destroyed and replanted. According to the different main pathogenic bacteria, choose the appropriate agent coating or seed dressing. For example, Manshijin and others have a good control effect on rotten bacteria, and fludioxonil and Weifu seed coating agent have better control effects on Fusarium.

2. Corn yellow leaf seedlings.

Characteristics: At first, the leaves of the seedlings are pale green, then gradually turn yellow, and in severe cases, the whole leaves die.

Control: seed coating or fertilizer water soaking; Remove small seedlings, weak seedlings, diseased seedlings and field weeds when the corn is 4 leaves; After the corn seedlings are intersided, nitrogen fertilizer should be applied in a timely manner; After seedlings, shallow and medium cultivation loosens soil to protect moisture.

3. Corn albino seedlings.

Characteristics: White streaks on the leaves, severe whitish whitening of the whole leaves. It occurs because of zinc deficiency in the soil.

Control: Mix 8 kg of seed fertilizer and 1 kg of zinc sulfate evenly, and apply it with sowing (seed fertilizer); For the seedlings that have been deficient in zinc, spray with 100 kg of zinc sulfate and water per mu, spray once every 7 days, and only need 2 3 times to make the seedlings return to normal.

4. Corn stiff leaf seedlings.

Characteristics: mainly appear before the seedling 3-leaf stage, the seedling plant type is small, the leaves are light green, the black roots are more, after transplanting, in addition to the new leaves are green, the outer leaves are yellow and stiff, the stress resistance is poor, and it is easy to appear dead leaves and dead seedlings.

Prevention and control: use compound fertilizer as seed fertilizer, cultivate to increase ground temperature; For the stiff seedlings that have appeared, it is necessary to strengthen watering and spray foliar fertilizer in time.

5. Corn purple leaf seedlings.

Characteristics: The leaf sheath of the seedling turns from green to red, and finally turns purple, which generally appears in the 3-leaf stage of corn, and is most obvious in 4-5 leaves, and the stems and leaves are small and the leaves are dead when it is severe.

Control: increase the application of phosphorus fertilizer; When the seedlings appear purple seedlings, they can be sprayed with potassium dihydrogen phosphate for 1 2 times, and generally sprayed once every 7 10 days.

6. Corn yellow and green seedlings.

Characteristics: The leaves of the seedlings are narrow, the plant type is short, the leaves appear yellow and green stripes, and the leaves are brown when severe, and finally scorched.

Control: increase the application of potassium fertilizer, if there is no potassium fertilizer, you can supplement the application of plant ash; For plots with severe potassium deficiency, seedlings can be sprayed with potassium dihydrogen phosphate, potassium chloride, and plant ash leaching solution at the 3-leaf stage.

Corn has a shorter growth period and higher yield than general crops, and the pests and diseases at the seedling stage will directly affect the formation of the yield in the later stage.

Underground pests that are seriously harmful to corn at the seedling stage include mole crickets, grubs, ground tigers, needleworms, etc., once they occur, they should be treated symptomatically and eliminated in time. Prevention and control method: watering the liquid medicine, with 50% phosphine emulsifiable concentrate per hectare, adding 750 kg of water to irrigate along the ridge.

There are also armyworms, thrips, Mongolian gray weevil, black velvet beetle, mesh sand diving and so on. For the control of armyworm, 50% phoxanthion emulsion 3000 times liquid spray can be used; Thrips are sprayed with 40% dimethoate emulsion or 50% dichlorvos emulsion 1500 times each; Spraying dimethoate and pyrethroid pesticides can also kill aphids, planthoppers and other poisonous insects, and play a role in preventing the occurrence of viral diseases. Thrips and gray planthoppers can be sprayed with 10% imidacloprid wettable powder 3000 times liquid spray for prevention and control.

For Spodoptera exigua, 1000 times of 90% crystal trichlorfon and 1000 times of 80% dichlorvos EC can be used to irrigate the roots, and 200 kg of medicinal solution per hectare; Corn heartworm can be used carbaryl wettable powder, 15 30 kg per hectare, mixed with 300 kg of fine soil, stirred evenly, sprinkled around the corn roots, kill and transfer the larvae; Spodoptera exigua can be used with 50% phoxanthion EC, 50% malathion EC, 35% phospho EC at 750 kg per hectare.

First figure out what kind of insect it is, and then choose the right pesticide for control. It is necessary to know that the medication of different pests is different, such as aphids and other pests of stinging and sucking mouthparts should choose systemic insecticides, and army worms and other chewing mouthparts pests can choose gastric poison insecticides.

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Summary. Hello! Drugs such as cypermethrin or 10% imidacloprid and its compound (1000 times liquid) can be sprayed for prevention and control.

During the prevention and control, drugs such as imidacloprid and acetamiprid can be sprayed.

During the prevention and treatment, it can be sprayed with drugs such as kung fu pyrethrin (1000 times liquid).

What medicine is used for corn seedling insect pests?

Hello! Drugs such as cypermethrin or 10% imidacloprid and its compound (1000 times liquid) can be sprayed for prevention and control. During the prevention and control, drugs such as imidacloprid and acetamiprid can be sprayed. During the prevention and treatment, it can be sprayed with drugs such as kung fu pyrethrin (1000 times liquid).

These are three different formulations.

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.