What pesticide is used for black bugs on corn leaves?

Corn virus disease has corn coarse shrinkage and dwarf mosaic disease (mosaic streak disease), the virus is transmitted by gray planthoppers and aphids, and the number of gray planthoppers and aphids in the field is closely related to the number of weeds in the field, and the number of gray planthoppers and aphids is related to the severity of wheat bush dwarf disease, so the occurrence degree of corn virus disease can be judged according to the degree of occurrence of wheat bush dwarf disease, and the prevention and control is mainly to eliminate weeds and insects to prevent the serious occurrence of corn virus disease.

Prevention and control methods: In the field investigation, if a suspicious disease plant is found, it should be immediately uprooted and sprayed with a disinfectant to control it.

The corn borer pays attention to the hatching progress of the eggs in the field and the damage of the larvae, and seizes the critical period to sprinkle granules on the corn borer of the first generation.

Control method: It can be made of emulsion granules, octathion emulsifiable concentrate into granules, or Beauveria bassiana granules, or 3% Leer granules, or 98% Bataan soluble powder granules into the corn bell mouth to kill the hatching larvae.

In late July, the number of eggs and larvae on 100 plants began to be investigated, and when it was found that 500 corn plants had 2 eggs, or more than 15% of the ears were bitten, it was carried out immediately.

Control methods: The larvae of the lamp moth hatch have the habit of concentrated harm, and there are more larvae after the corn silking, so you can organize artificial insect catching, or spraying for control.

In the process of corn cultivation, more fertile leaf foliar fertilizer should be sprayed to enhance the resistance.

Corn borer (corn borer) is a major pest of corn. In severe years, corn yield can be reduced by more than 20%. Its larvae can penetrate into the main stem and ear, which can break the main stem of corn, resulting in a reduction in corn yield.

This little black bug is supposed to be an aphid, and you can use sprays of these varieties than pyridoxiprid.

First of all, we have to look at what kind of worm it is, so that we can prescribe the right medicine, the following are some worms that often appear in corn, I hope it can help you.

1. Corn borer.

Corn borer, commonly known as corn borer, is one of the main pests of corn. Spraying Bacillus thuringiensis preparations at the end of corn heart leaves can control corn borer, if sprayed with thiamethoxam, chlorantraniliprole and other pesticides and emamectin salt, it can not only improve the control effect of corn borer, but also control aphids, leaf mites and other pests. In the large bell mouth stage of corn, it can be mixed according to the ratio of phosphine granules plus fine sand 2 per mu, and then sprinkle 2-3g in the large mouth of each plant to control corn borer.

2. Aphids. Aphids not only damage the heart leaves at the seedling stage of maize, the panicle part after heading, and affect pollen at the flowering stage, but also can transmit corn dwarf mosaic virus disease, thereby threatening maize yield. Spraying 3% Tianda acetamiprid 1500 times, imidacloprid, acetamiprid and other pesticides on corn plants can control aphids.

3. Armyworms. Armyworms, commonly known as colorful insects, especially like corn leaves, are one of the main pests of corn seedlings. When the armyworm infestation is serious, the leaves can be eaten up, leaving only the corn stalks, resulting in a bad harvest. Spraying 2000-2500 times of cyhalothrin solution or 1000-2000 times of 20 fenozide suspension on corn plants can effectively control corn armyworm.

Fourth, grubs. Grubs are commonly known as white soil silkworms and walnut insects, and the adults are all kinds of beetles, which are the most serious underground pests that harm corn. Grubs not only like to eat freshly sown seeds, but also bite off the corn taproot, which causes the lack of seedlings to break in severe cases. On the one hand, 3-4 kg of chlorpyrifos per mu can be used for control during land preparation, and on the other hand, insect pests can be controlled by applying insecticides such as trichlorfon and phosphine.

Fifth, the ground tiger.

The larvae of the ground tiger are commonly known as rootworms, and their larvae often bite off the base of corn seedlings near the ground, and it is also one of the underground insect pests that seriously harm corn. The diluted trichlorfon is easy to mix on the chopped gray cabbage, and sprinkle it evenly near the roots of corn seedlings in the evening, which can effectively control the ground tiger larvae before the third instar, and the elderly ground tiger larvae need to be controlled with phosphine emulsifiable concentrate.

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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Corn leaf spot can be controlled with thiophanate-methyl and foliar fertilizer spray.

Prevention and control methods: In the early stage of the disease, use 50 kg of dibacterim or 50 methyl tobuzin or 50 antibacterium 2000-3000 times, 600 times of 2116 grain type, 1500-2000 times of Tianda Yufeng, spray 2-3 times, and spray 1 time with an interval of 10-15 each time. Or spray 1-2 times with 50% Pythium tianda 50-100 grams at the end of the heart leaf to the filament stage.

Maize leaf spot mainly damages leaves and bracts. The lesions are irregular, translucent, grayish-white, brown at the edges, and black dots on top, that is, the ascomycetes of the pathogenic bacteria. The pathomycetes are born on both sides of the leaves, scattered or clustered, and are initially buried, with round orifices exposed outside the epidermis.

Ascomycetes are rectangular, nearly rod-shaped to sac-shaped, 35 to 55 microns in size. Ascospores are rectangular, colorless, with 1 septum, slightly constricted at the septum, 1 2 oil droplets in the cell, 14 16 μm in size.

If more aphids are found, 10% imidacloprid wettable powder 1000 times, 10% cypermethrin emulsifiable concentrate 2000 times, cyfluthrin 2500 times or 50% aphid-resistant aphid wettable powder 2000 times, 25% thiamethoxam water dispersant 6000 times and other sprays for reference.

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.

Corn insect medicine: 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. Homemade granules can be sprinkled into the corn heart leaves to kill corn borer larvae.

Pyrethroid insecticides are effective in removing the leaves quickly from newborn pupae so as not to grow more.