What are the hazards of corn aphids? How can we prevent it?

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.

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.

In the face of corn aphid pests, the main control methods generally adopted are agricultural control, chemical control and biological control. The effect of pesticides and biological control is lower than that of chemical control, but in chemical control, there should be a clear understanding and identification of the choice of agents and drug time.

Corn aphid, also known as corn aphid, is widely distributed in China's northeast, eastern, northern, southwestern, southwest and other corn producing areas. In addition to damaging corn, this aphid also has a very harmful effect on crops such as sorghum, barley, millet, wheat, and rice. It is a common pest.

The specific damage of corn aphids to corn.

During the seedling stage of maize, corn aphids will gather on the back of young leaves and heart leaves for grazing, and at the ear stage, they will gather on the calyx and spike stalk of male flowers, and the filaments of female bracts and their upper and lower adjacent leaves for harm. During the tasseling stage of maize, the pollination of maize plants was affected, resulting in obvious bald tips and few rows of grain loss in female ears. Aphids on the leaves, in addition to absorbing the juice of corn, will also excrete a large amount of "honeydew", which will affect the photosynthesis of corn, cause mold parasitism, lead to the growth of the infested plant weakened, cause stunted growth and no ear setting and other problems.

Ultimately affecting the reduction of corn yields. <>

For green pesticide-free plants, agricultural and biological control are used.

Under normal circumstances, agricultural prevention and control mainly includes strengthening field management, reasonable crop rotation, removing weeds at the edge of the field, reasonable fertilization, irrigation is required, and the selection of disease-resistant varieties should be paid attention to. However, agricultural control requires farmers to have rich experience and long-term inspections. Biological control is divided into insect control and bird insect control, insect control such as wheat aphid cocoon bee, Chinese lacewing, black-banded aphid fly, grass small black spider and so on have a good control effect on corn aphids, birds such as magpies, turtle doves, house swallows, white-headed bulbul and other birds will also eat aphids.

It plays a certain role in its prevention and control. However, insect control and bird insect control cannot be carried out at the same time, otherwise it will lead to birds catching beneficial insects, which reduces the control effect. <>

According to the level of control effect, chemical control is generally used.

Chemical control is currently the most widely used and most effective method for the control of corn aphids, such as avermectin, imidacloprid, pymetrozine, acetamiprid and other agents, as long as they are reasonably diluted and sprayed according to local conditions. It will have a very good prevention and control effect. Moreover, it has the advantages of long duration, easy application, low cost and low environmental impact.

However, in the use of chemical agents, special attention should also be paid to the selection of pesticides, and under the premise of ensuring the efficacy, the pesticides with low concentrations that can kill aphids and protect natural enemies are preferred. It should also be noted that the choice of time of day and the time of the onset process have different effects on the prevention and treatment effect. It depends on the actual situation to spray.

The technical point is. Planting skills, soil cultivation methods, fertilization skills, disease prevention problems, and disease prevention and control.

1. Pesticide seed dressing 2. Spraying and fertilizing 3. Improving the environment When there is aphid damage, in addition to spraying drugs to prevent and control, it is necessary to improve the environment.

You can spray some drugs, seed dressing to prevent aphids, granules to control aphids, these are very good, the effect is very good.

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!