Corn aphids affect the growth of corn, how to control corn aphids?

Agricultural control. Eradication of weeds at the edge of the field and in the field can reduce the source of insects. Chemical drug prevention.

3% acetamiprid EC 2000 times, 25% hypertonic ytricepharid EC 2000 times, or 10% imidacloprid EC 3000 times, or cypermethrin EC 3000 times liquid spray control. Pay attention to mix thoroughly. After the seeds germinate, a single spray of the drug can effectively prevent aphids.

Generally, it is coated with 70% thiamethoxam seed coating agent, or 10% imidacloprid wettable powder is used to dress seeds, which has a good effect on aphid control at the seedling stage. Furthermore, it is necessary to pay attention to improving the corn growth environment, and if herbicides are not used, it is necessary to hoe the weeds in the field in time at the beginning of the corn seedling stage.

If corn found a large number of aphids must be sprayed pesticides, if not sprayed will seriously harm the autumn harvest, the yield reduction is particularly obvious, spraying pesticides must be in accordance with the requirements of the instructions, using ordinary sprayers, back spraying, so that the effect is better, the spraying process must pay attention to safety! Aphids live by stinging and sucking the sap of plants. When aphids are seriously harmed, they can make plants grow slowly, causing leaves and stems to dry up, which is also often mentioned by ordinary people

The crops were killed by the worms. After the plant is sucked, it not only loses nutrients, but also the wound caused by it is easy to be infected by germs and cause diseases.

But now it's much easier to have drone spraying. However, no matter what kind of prevention and control is adopted, we must pay attention to the priority of efficiency, if the prevention and control is done, the corn yield has not increased, and it is the same as not being controlled, and the cost has also increased. It can also be sprayed with 2000-3000 times of 50% anti-aphid wettable powder, 2000 times of 10% imidacloprid powder, and 3000 times of 25% pymetrozine wettable powder.

Or use 50 ml of 40% dimethoate emulsifiable concentrate per mu, mix it with 500 liters of water, and make poisonous soil with 15 kg of fine sand, and evenly sprinkle about 1 gram per plant on the heart leaves of corn plants.

Before corn sowing, 30% thiamethoxam was used to suspend the seed coating according to the ratio of 1:200 400. Wrap the seed coating evenly on the surface of the corn seeds, dry in a cool place and sow the seeds.

1. Seed coating or seed dressing. Coated with 70% thiamethoxam seed coating agent, or mixed with 10% imidacloprid wettable powder, the control effect of aphids at the seedling stage is better.

2. Use granules. At the heart leaf stage of corn, before the aphids are in full bloom, sprinkle 3% phosphine granules kilograms per mu in the heart leaves, or 300 500 grams of 15% chlorpyrifos granules, and mix fine sand soil in the ratio of 1:30 40 and evenly sprinkle them in the heart leaves, and treat corn borer.

3. Spray prevention and control. If more aphids are found, 10% imidacloprid wettable powder 1000 times liquid, 10% cypermethrin emulsifiable concentrate 2000 times liquid, cyfluthrin 2500 times liquid or 50% aphid anti-aphid wettable powder 2000 times liquid, 25% thiamethoxam water dispersant 6000 times liquid and other sprays.

Corn aphid is one of the most harmful pests in the growth process of corn, corn aphid harms corn ears, is a systemic pest, mainly absorbs the juice of corn, hinders the growth of corn, is extremely harmful to corn, and needs to focus on prevention and control. The above details how to treat corn aphids (greasy insects), corn aphid control methods and other relevant information, and it is recommended that corn farmers study hard and take preventive measures in advance.

The impact of corn aphids on corn is very large, so you must spray pesticides in time, you can choose imidacloprid wettable powder, one to three times, the effect is still very good.

Use a brush to brush off the pests, then spray imidacloprid and pyrethoxam as soon as possible, weeding should be done frequently, and it is best to plant them in a well-lit place when planting, as the chance of infection with aphids will be reduced if there is enough light.

Before corn sowing, use some special chemical fertilizers and pesticides to spray on the rhizomes and leaves of corn, so that it can have a control effect.

It can be prevented by means of pesticide seed dressing, but also by fertilizing with pesticides, and by improving the environment by spraying pesticides.

thiamethoxam is a second-generation neonicotinoid insecticide, which is mainly used for contact killing and stomach toxicity, and has the advantages of wide insecticidal spectrum, good water solubility, fast conduction speed and good stability, and is an excellent insecticide for the prevention and control of stinging and sucking pests. Because thiamethoxam has good water solubility and systemic conductivity, good stability in the soil, it can also be used for seed coating, not only can effectively control needleworm, ground tiger, Spodoptera exigua, and other underground pests, but also can be used to control aphids, thrips, planthoppers and other ground pests, good insecticidal effect, long duration of effect, cheap, widely used in production.

1. Seed dressing, before each sowing of corn seeds, an appropriate amount of thiamethoxam, imidacloprid and other agents and seeds can be planted into the soil, and the seeds are coated through these agents, and when the seeds are about to take root and germinate, they are sprayed with thiamethoxam and imidacloprid again, and the second coating is carried out, which can effectively prevent corn. 2. Fertilizer application, insect pyramid, imidacloprid and other agents are the nemesis of aphids, and the control methods of corn aphids also need these agents, in fact, not only can these agents be used when sowing, in fact, every time the corn is fertilized, it can also be mixed with some insect pestam and imidacloprid at the same time, so that corn can avoid the harm of aphids.

1. Prevention and control methods of corn aphid 1. Regularly clean up the weeds in the field, mainly to clean up the growing area of corn aphid.

2. Use 50% anti-aphid 3000 times solution, 40% dimethoate 1500 times solution, 50% dichlorvos 1000 times solution, and 3000 times dichlorvos solution for spraying and control corn aphids.

3. You can pour the liquid medicine into the center of the plant, or use 50 100 times of 40% dimethoate to smear the stem.

2. Harmful symptoms of corn aphids 1. Adult corn aphids will suck the juice of plant tissues, which is easy to cause yellowing or reddening of leaves and plant death.

2. Corn aphids are concentrated in the heart leaves, which will produce black mold, resulting in yellowing and death of leaves, and mildew and blackening of leaves.

3. Corn aphids are mainly parasitic on corn, sorghum, wheat and dogtail grass, which is not conducive to the growth and development of plants.

4. Compact corn mainly sucks the juice of corn, causing corn leaves to turn yellow and plants to die.

The harm of corn aphids is mainly manifested in the wilting and yellowing of corn stems and leaves, and the stagnation of plant development, which then affects the flowering and pollination of corn and the development of ears and seeds, and reduces the yield of corn. Control methods can be sprayed to control such as cypermethrin, etc., and biological methods can also be used to control such as stocking aphid wasps.

Corn aphids can cause a serious reduction in corn yield, and will affect the quality of corn, so that the starch content of corn will be reduced, and corn will also appear yellow, and the corn heading period will be reduced. At the time of corn heading, it is necessary to prevent the corresponding water replenishment in time, adjust the fertility of the soil, ensure sufficient sunlight, and spray pesticides in time.

It will cause the corn leaves to turn black, or black mold, and the leaves will turn yellow and die, the plant may stop growing, and there will be a lot of diseased liquid in the roots. You can use pesticides to prevent pests, or take measures to prevent pests in advance, and understand the way to this pest.

Corn aphid is one of the common pests and diseases that harm the growth of corn, so how to control corn aphid? Here are some control methods for corn aphids.

Corn aphids are a pest.

Corn aphids belong to the order Homoptera, the family Aphids.

It is also known as corn aphid; It is commonly known as wheat worms, greasy insects, ant insects, etc.

It is mainly harmful to corn, wheat and other crops, and also to harmful grass weeds such as dogtail grass, cow tendon grass, and barnyard grass.

To become and suck the sap of the plant if the aphid spines.

Adults and aphids gather on the back of leaves, heart leaves, filaments and male spikes to feed, can secrete "honeydew" and often form black mold in the damaged parts, affecting photosynthesis, and the leaf edges are yellow; Occurring on the male panicle can affect pollination and lead to reduced yield; The severely damaged plants have thin ears, incomplete kernels, and long bald tips.

In addition, aphids can also spread corn dwarf mosaic virus and red leaf virus, resulting in greater yield loss caused by viral diseases, and at the same time, aphids absorb a large amount of sap, so that the moisture and nutrients of corn plants are out of balance, affecting normal filling, resulting in an increase in seeds, a decrease in grain weight, and even a "empty plant" without a stick.

Occurrence of corn aphids.

It occurs about 20 generations a year, and the adult and aphid overwinter in the heart leaves of wheat and grasses such as early maturing grass and wheat lady.

From March to April of the following year, as the temperature rises, they begin to move and reproduce on the overwintering hosts.

In late June, aphids migrated from other hosts to summer maize, and in late July, a large number of maize aphids moved in, and the aphids were harmful in the heart leaves before tasseling, and the maize entered the tasseling stage from the end of July to early August, and the corn aphids proliferated rapidly.

From early to mid-August, it enters the peak season, and the number of 100 aphids reaches more than 10,000.

At the end of August, a large number of natural enemies appeared, the climate was dry and cool, and the number of aphids decreased sharply, concentrated in the leaves or lower leaves of the female ear bracts, and the winged aphids were produced before the corn harvest to migrate to other hosts.

Corn aphid control methods.

Agricultural control. Weeds in the field in a timely manner.

The wheat ridge interplanting corn cultivation method is 10-15 days earlier than the corn sown after wheat, which can avoid the peak period of aphid reproduction and reduce the damage.

Seed dressing. Before corn sowing, it can be coated with 70% thiamethoxam (Ruisheng) seed coating agent, or mixed with 10% imidacloprid wettable powder, which has a good effect on aphid control at the seedling stage.

Chemical control. The high-efficiency cyhalothrin produced by New Zealand Sepur (China) Crop Protection **** is safe and environmentally friendly, not affected by temperature, and can be mixed with herbicides, which is harmful to aphids, red spiders, green worms, corn borers and other pests on corn!

1. Drug prevention and treatment. When a large number of aphids are found, timely spraying of pesticides can be carried out with even spraying of thirsty sla. 2.

Artificial control. In autumn and winter, whitewash the base of the trunk to prevent aphids from laying eggs; Combined with pruning, cut off the damaged branches and residual flowers, and burn them intensively to reduce the overwintering insect population; In winter, scrape or brush off the densely overwintering egg masses on the bark, clean up the residual branches and leaves in time, and reduce the eggs of overwintering insects; When a small number of aphids are found on the flowers in spring, you can use a brush dipped in water to brush them off, or place the potted flowers under tap water and rinse them in a swirling way. 3.

Protect predators. There are many natural enemies of aphids, including ladybugs, lacewings, aphid flies and parasitic wasps, etc., which have a strong inhibitory effect on aphids. Try to apply as little broad-spectrum pesticides as possible, avoid applying pesticides during the peak period of natural enemy activities, and artificially raise and release aphid natural enemies if conditions permit.

We can spray more insecticides, and be sure to water more often, and then ventilate quickly, so that we can prevent aphids.

In this case, you should buy some pesticides or insecticides and spray them on the leaves to prevent such diseases.

When corn is harmed by aphids, it will seriously affect the growth and should be controlled in time. Imidacloprid and pyrethoxam can be sprayed, once a week, three or four times can be completely controlled. Usually fertilization can also be doped in the fertilizer to control insect pests.

In addition, the agent and seeds can be mixed together when sowing seeds to prevent the occurrence of insect infestations. When administering, it is necessary to ventilate and weed more to reduce the chance of infection.

At this time, it is necessary to spray pesticides for ground aphids in time, so that you can effectively improve the damage of pests and diseases to corn, and do not overdo it when spraying, which will also make it easy for corn seedlings to have problems.

A large number of pesticides should be sprayed in time for control, and weeds in the field should be treated to ensure that there will be no pests and diseases in this process.

Spray the bactericidal agent in advance, and pay attention to scientific management, and also apply some foliar fertilizer for prevention, spraying fertilizer around the corn field.

The types of common adverse effects of insect pests and fertilizer control methods in maize fields are summarized as follows:

Underground pests (grubs, needleworms, tillage mealybugs, etc.): the use of 70% thiamethoxam coating agent, 70% acetamiprid wettable powder seed dressing or coating agent film coating with the above ingredients, underground pests can be reasonably manipulated. At the same time, it has a certain regulatory effect on whitefly, cotton aphid and planthopper at the seedling stage.

1. Corn borer: comprehensive utilization of straw in autumn in the summer maize area of the Huanghuaihai River section, and 15 days before the pupation of the spring corn area in the northern region to carry out Beauveria bassiana sealing to reduce the number of corn borer overwintering juveniles. In the early stage of the winter generation nymph mask, sexual attractants were used to trap them, and the masks were entrapped.

Red-eyed bees are released in the early stage of egg laying of corn borers. When the reproduction rate of corn borer eggs reaches 30%, spray BT traditional Chinese medicine preparations. Bet or chlorpyrifos or phosphine granules in the later stages of the heart lobe, or apply cyhalothrin spray.

It can be marketed and promoted by railing sprayers to spray BT traditional Chinese medicine preparations to prevent corn borer technology.

2. Corn cotton aphid: spraying in the early stage of spot occurrence and flourishing, using a walking railing crop sprayer to spray acetamiprid or pymetrozine.

3. Corn leaf mites: In areas with prerequisites, water and drought rotation should be implemented, and weeds should be hoeed immediately to solve the initial leaf mite habitat site. When leaf mite spot pieces occur, prevention should be carried out immediately, can use avermectin, alkyne mite, pyridoxin, thiobenone, acetamiprid and other sprayers or each other to carry out effective mixed spraying, and at the same time add 1% urea solution water, which can have the effect of repairing the foliar surface and improving the control effect.

The sprayer is the key to preventing the opposite side of the middle and lower foliage of corn. It can be marketed and promoted as a railing sprayer or fog machine with high efficiency and mite control technology.

4. Corn stem rot: use planting disease-resistant varieties. Using flurobacterial? Nail cream floating coating, film coating reduces morbidity.

5. Corn brown spot disease: use disease-resistant varieties. Apply base fertilizer and moderate fertilizer in stages to improve plant disease resistance.

Reasonable dense planting, improve the transparency of the field, reduce the level of disease or delay the occurrence period. In the early stage of the disease from the heart lobe to the scratching stage, propiconazole can be sprayed on the leaves; Difenoconazole, mancozeb (full complex), thiophanate-methyl, pyraclostrobin, pyraclostrobin and other drugs should be sprayed once every 7-10 days depending on the onset of the disease, a total of 2 3 times.

6. Corn sheath blight: use disease-resistant species. Blend with soil hoeing to peel off the tip of the petiole and expose the stem, which can alleviate the onset of the disease. In the early stage of the disease, 5% Jinggangmycin or 40% sclerotia can be sprayed on the stem base petiole 1000 1500 times, with an interval of 7 10 days.

7. Corn coarse shrinkage disease: the area where the coarse shrinkage disease is more serious, to prevent wheat and summer corn from interplanting; Late sowing of summer maize at an appropriate time can effectively manipulate the occurrence of maize roughness shrinkage disease. After corn planting, before germination, the implementation of "sealing" and "killing" organic chemical weeding at the same time to add methyl parathion insecticide to solve the crude shrinkage virus disease transmission ** gray planthopper habitat place.