What are the underground pests that harm corn? How can it be prevented?

The more common pests are mole crickets, grubs, ground tigers and needleworms. Some pesticides can be used in the land, some pesticides can also be used, and the soil can also be disinfected and sterilized, so that some pests can be prevented from appearing in the soil.

Beetles, locusts, ants, ground tigers, these are very harmful to the growth of corn; When planting, first of all, we should carry out reasonable work of agricultural control, and we should carry out drug control, use some pesticide dressing to remove and control pests, and regularly clean up weeds.

grubs, needleworms, mole crickets, ground tigers, beetles; You can spray some pesticides and mix some medicines when planting corn.

The underground pests that harm corn include mole crickets, grubs, needleworms, ground tigers, and Spodoptera exigua. It is necessary to do a good job in water and fertilizer management, scientific fertilization, reasonable watering, and spraying drugs to prevent and control.

The main drugs are phosphine, methylisobutylphos, etc. The dosage of 50% of phosphine emulsion is 0 of the seed amount 2%-0.

3%, the dosage of methyl isobutylphos 40% is 0 of the seed amount 2%。Before stirring, the amount of water added to the agent is 5%-7% of the seed amount.

Spray and stir evenly while stirring, then steam for 4-8 hours. Attention must be paid to the safety of humans and animals. Pesticides are used to treat soil with 5% phoxanthion granules per mu.

Or mix with 50% phoxanthion emulsion or 40% methylisobutylphos emulsion 100-150, mix soil 20-25, evenly spray on the whole field, and spray together with the rake. Black light, sugar, wine, vinegar can also be used to trap moth liquid, nicotine sulfate or clam fermentation broth, toothpick or paulownia leaf to trap adult insects. The tiger's old larvae can go down to the ground every morning to remove the topsoil around the newly infested plant or on the sunny slope of the furrow, and catch the larvae to kill them.

There are five kinds of underground corn pests, including centipedes, salamanders, enoki mushrooms, crickets and small tigers, which are one of the main pests in corn production, and centipedes are the most serious. Due to the erosion of corn seeds, young shoots and roots by underground pests, the lack of corn seedlings and broken ridges are caused, and the general lack of seedlings is more than 10%, and even the whole field destroys the seedlings, which seriously affects the corn yield. The underground pests at the seedling stage of corn mainly include small tigers, centipedes, salamanders, enoki mushrooms, etc.

In the area of Ulanchabu City, Inner Mongolia, the underground pests of corn mainly include centipedes, ground tigers, needleworms, etc., which are the most harmful underground pests. There are mainly small tigers, yellow tigers, big tigers, etc. Small tigers and yellow tigers are the main ones that harm vegetables, and small tigers are the most widely distributed and seriously harmed.

Polyphagous pests, which mainly harm seedlings with larvae. The larvae bite off the stem close to the ground of the seedling, causing the entire plant to die, creating a monopoly of seedling shortage.

The main drugs are phosphine, methylisobutylphos, etc. The dosage of 50% of phosphine emulsion is 0 of the seed amount 2%-0.

3%, the dosage of methyl isobutylphos 40% is 0 of the seed amount 2%。Before stirring, the amount of water added to the agent is 5%-7% of the seed amount.

1. Pesticide control: spray cypermethrin and emamectin saline dispersible granules alternately for corn. 2. Drug dressing:

Prepare the seed dressing mother liquor and mix it well with the corn seeds. 3. Poisonous bait trapping: spray trichlorfon on vegetable leaves and put them in the field to trap and kill underground pests.

4. Precautions: After the harvest of the first crop, pay attention to eradicating weeds in the field in time.

1. Pharmaceutical prevention and control

In the early stage of the occurrence of underground pests in corn, it can be sprayed alternately with 1000 times of 5% cypermethrin and 3000 times of emamectin saline dispersible granules, which have a strong control effect on small ground tiger and Spodoptera exigua.

2. Drug dressing:

Before sowing, in order to prevent the attack of underground pests in the later stage, 10 ml of 20% chlorantraniliprole suspension and 60 ml of 60% imidacloprid suspension seed coating agent should be used to prepare the seed dressing mother liquor, and then it should be fully mixed with the seeds, dried and then sown.

3. Poison bait trapping

In the early stage of corn infection with underground pests, you can mix 100 grams of 90% trichlorfon crystals with 1 kg of water, and then spray wine on chopped vegetable leaves, and wait until evening to put them in the field at a fixed point to trap and kill pests, effectively killing the ground tigers under the corn.

4. Precautions

During the planting of corn, it is necessary to implement reasonable crop rotation and stubble, change the ecological environment of the soil, destroy the reproduction of underground pests, and pay attention to eradicating weeds in the field in time after the first crop is harvested, so as to reduce the place where pests lay eggs.

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.

<>1. Agricultural prevention and control: reasonable crop rotation, not replanting corn, in order to reduce the base of insect sources, and at the same time, irrigation should be carried out in combination with deep tillage work, weeds should be removed, and an environment that is not conducive to the growth of pests should be created. 2. Drug prevention and treatment

Before ploughing, mix 15-25 kg of fine slag with 100 ml of 50 phosphine emulsion, then sprinkle it into the planting area and rake it into the soil, or mix 50-60 kg of fine soil with 50 kg of phoxanthion and sprinkle it around the corn seedlings.

1. How to control corn underground pests

1. Agricultural prevention and control.

1) Reasonable crop rotation.

In areas with severe insect pests, it is not advisable to plant corn in heavy crops, or avoid crop rotation with Solanaceae, leguminous and cruciferous crops to reduce the base of insect sources.

2) Irrigation and deep ploughing.

Before spring sowing, irrigation is carried out in combination with deep tillage work, and weeds are removed from the planting field at the same time to destroy the breeding environment of insect eggs and reduce the base number of insect populations.

Irrigation also regulates the temperature and humidity of the soil, creating an environment that is not conducive to the growth of pests, which can lead to a pest mortality rate of more than 90%.

2. Drug prevention and treatment

1) Soil treatment.

Before ploughing the land, mix 15-25 kg of fine slag with 100 ml of 50 phosphine emulsion hail, and then sprinkle it on the planting ground and rake it into the soil, which can kill grubs and needleworms.

2) Sprinkle poisonous soil.

Use 50 kg of phosphine to mix 50-60 kg of fine soil, and then sprinkle it around the corn seedlings, which can control a variety of underground pests.

3) Spraying agents.

Spray 50 phosphine 800 times or 20 fenvalerate, deltamethrin 3000 times, or spray the ground with other pyrethroid insecticides.

To control grubs, you can mix trichlorfon in vegetable leaves to make poisonous bait, and then trap them.

If you want to control ground tigers, you can use 30-40 ml of emulsifiable concentrate mixed with 75 kg of water, and carry out regular spraying after sunset (stems and leaves should be wet), and spray 1-2 times in a row.

4) Root irrigation and spraying.

To control needleworm, irrigate the roots with phosphine or chlorpyrifos mixed with water. In the evening, the seedlings and their surrounding ground can be sprayed with pyrethroids, organophosphates and other pesticides.

Second, when is the control effect of corn underground pests good?

1. After wheat harvest.

After harvesting wheat, the broken wheat straw in the planting field is collected (baled) or taken out of the planting area and piled on the roadside to make organic fertilizer to destroy the habitat of Spodoptera exigua, and reduce the number of eggs.

2. Before sowing.

Before sowing, seed dressing was carried out with 40% bromoyl·thiamethoxam seed treatment suspension, or 50% chlorantraniliprole seed treatment suspension.

3. Early stage of larvae.

In the early stage of larval occurrence (when the damage rate of corn seedlings reaches 3%), spray 1500-2000 times of emamectin indoxacarb suspension, or spray 14% emamectin fenapyr suspension 3000 times, and spray the stem base of the seedlings along the ridge.

In order to promote the complete emergence of maize, seedlings should control the underground pests of maize in time. Here, let Bian Xiao introduce the key control technology of corn underground pests. In areas with serious underground pests, water-dry rotation should be carried out to reduce the number of insect sources, and the previous crops can be rice, callus and other crops.

Before spring sowing, farmland irrigation combined with deep tillage should be carried out to remove weeds in the field to reduce the population base and the breeding ground of eggs. According to the characteristics of strong phototaxis of adults, black light and frequency vibration insecticidal lamps were used to trap and kill at night during the development period of adults. Each frequency vibration insecticidal lamp covers an area of 2 hectares, which can effectively trap and kill adult insects such as grubs, grubs, and ground tigers, and reduce the eggs by about 70%.

After transplanting sweet corn, a poisonous bait ring was made with kilograms of trichlorfon + kilograms of phosphine + a small amount of brown sugar + 20 kilograms of rice bran for the prevention and control of ground tigers and mole crickets. Sweet corn seedlings, morning and evening check the occurrence of tigers in the field. When it is found that the tiger is harmful, it should be caught manually in time to reduce the harm of pests.

1 kg of 5% insecticidal double granules + 25 kg of fine soil, or 100 ml of 50% phoxanthion emulsion mixed with 15 25 kg of fine residue, sprinkled on the ground before ploughing.

Although most of the corn seeds bought now are coated seeds, what is the coating agent used? I don't know, but to be on the safe side, it's better to do another seed dressing. Pre-sowing seed dressing can prevent a variety of pests and diseases, save trouble and have good results.

In recent years, there are too many underground pests, and corn seed dressing can effectively control a variety of corn pests and diseases, such as beet armyworm, grub, needleworm, thrips, second-generation armyworm, brown spot, stem base rot, tumor black powder, etc.

If there are too many enoki mushrooms in the field, the following remedial measures can be taken in the fields where the enoki mushroom is severely damaged: 50% phosphine or 15% chlorpyrifos EC 1000 times the roots. The roots can also be irrigated with a 1000x solution of 90% crystalline trichlorfon.

In addition to needleworms, underground pests that eat corn include ground tigers, grubs, mole crickets, etc. These pests all bite the seeds, roots, seedlings and other parts of the corn, affecting the emergence of the corn. Some farmers mix kilograms of 20% phosphine with 60 kilograms of fine soil and sprinkle them around corn seedlings, which is also very effective in controlling underground pests.

Spraying and killing, and pay attention to agricultural control, or direct manual killing, pay attention to strengthen management during planting, and observe the survival rate of corn seedlings.

When the corn is sown, the land should be turned deeply, and the corn medicine and pesticides should be mixed before sowing to effectively prevent pests and diseases in the soil.

Urea can be evenly sprinkled in the field corn field and then watered, not only top dressing, but also can control underground pests.

Generally, the varieties that control pests are selected in advance, and the seeds of corn are also sterilized and disinfected, and the soil is also sterilized and disinfected in advance, and drugs are also sprayed during the planting process.

(1) Reasonable crop rotation: In areas where underground pests are serious, it is strictly forbidden to replant or avoid planting Solanaceae, leguminous and cruciferous crops. Through crop rotation, it can effectively kill underground pests and reduce the number of insect sources.

2) irrigation and deep tillage: before spring sowing, farmland irrigation combined with deep ploughing, remove weeds at the edge of the field, in order to reduce the base number of insects and the breeding place of eggs, through irrigation to change the soil temperature and humidity, resulting in an unfavorable environment for pests, which can make the mortality rate of pests reach more than 90. (3) Soil treatment:

Mix 15 25 kg of fine slag with 100 ml of 50 octathion emulsion, sprinkle it on the ground before ploughing the land, and rake it into the ground to kill grubs and needleworms.