How to control corn pests and diseases? Is there any good way to do this?

<> cotton bollworm: release red-eyed bees to kill eggs at the early stage of oviposition, or use Bacillus thuringiensis preparations, aminoavermectin benzoate, chlorbenzamide and other spray control during the peak period of egg hatching.

Subterranean pests and thrips, aphids, planthoppers, beet armyworms, armyworms, cotton bollworms and other seedling pests: Seed coating agents containing thiamethoxam, imidacloprid, chlorantraniliprole, cyanamide and butanedicarbonyl compounds are used.

Double-spotted tarsal nematode: during the corn silk pollination period, when the average number of single spikes on the filaments exceeds 5, it should be controlled, using imidacloprid, thiamethoxam, cyhalothrin, cypermethrin insecticide spray, and spraying the liquid directly on the ear silk. Spray before 10 a.m. and after 5 p.m.

Corn aphid: In the area where aphids are common throughout the year, the application of thiamethoxam seed coating agent has a good control effect on corn aphids in the later stage. In the maize tasseling stage, spray aphids with thiamethoxam, imidacloprid, imidacloprid and other agents.

Spodoptera exigua: idle fields in late winter, stubble or stubble clearing before sowing, and clearing the corn sowing furrow cover; or on a seeder equipped with a ridge clearing device, directly remove the covering of the seeding furrow; Seed coating agents containing succinylurea, cyanoanthramidide and other medicinal ingredients are used for seed coating. Chlorbenzamide, emamectin benzoate, etc., can be used for emergency prevention and control, and spraying, poison bait or poison bait spraying toxic soil can be used.

Disease-resistant varieties, rational planting, scientific fertilization. At the end of the corn heart, spray benzoylmethylconazole, tenazolol, pyrazoleethyl and other fungicides and again every 7 to 10 days depending on the incidence. Brown spot disease is treated at the 8-10 leaf stage of maize.

The above are some of the main control measures for corn diseases and pests, I hope it can solve the urgent need and help you.

Spraying pesticides should be the best way to control corn diseases and pests, and pesticides can also be sprayed in the soil, which can also play a role in sterilization. Of course, you can also water more and fertilize more. This can also control these pests and diseases.

You can apply some fertilizer to the corn when planting it, and you can also use it as an insecticide. The best way is to sprinkle some pesticides on the corn, help the corn do the work of deworming, fertilize the corn, and choose better quality corn seeds.

There is a good way, first of all, it is necessary to pay attention to the fertility of the soil, and it should be watered and fertilized in time, and it is necessary to do a good job in seedling raising, which should be sprayed with pesticides and fungicides in time, and the temperature of planting should also be paid attention to, and ventilation should be done in time.

Choose the right varieties for planting, prepare in advance, pay attention to watering, pay attention to fertilization, and pay attention to spraying pesticides, so that prevention can be carried out in advance, and crop rotation must be made.

With the development of the economy, corn is not only used as a staple food, but also as a deeply processed product in the market. The conditions for growing corn are relatively easy to meet, so the planting area in the north is widespread. But corn in the north is susceptible to disease and pests.

Once corn is infected, the consequences can be very severe. So, what are the commonly used pest control methods for corn?

plant varieties that are resistant to corn rust should be more; strengthen field management, remove weeds in the field, and reduce the invasion of pathogenic bacteria; Scientific management, proper fertilization and watering to improve the resistance of corn to disease sources; In severe disaster areas, drugs can be sprayed at the onset of the disease, generally 2-3 times at an interval of about 8 days. For the general recurrence area, the corn should be harvested in time during the growth period to promote the growth of corn and reduce the occurrence of diseases. For the areas with severe disease, fungicides should be sprayed once before corn sowing and after emergence, such as fungus must be cured, bacteria should be eliminated, etc., and corn should be reasonably densely planted to reduce the re-infection of pathogenic bacteria.

For corn with yellowed leaves, carbendazim and other agents should be sprayed for disinfection at the beginning of the disease, and foliar sprays of antiviral agents, such as polyantimycin, should be carried out after the onset of the disease in maize, so as to increase the ability to resist the disease and reduce the impact of the disease on the corn. About 7 days after corn sowing, small brown round spots appear on corn leaves, and gradually expand, forming irregular dots on both sides of the leaves, which are the channels for pathogenic bacteria to invade from the leaf sheath, and can expand the lesions under high temperature and humidity. Severe lesions produce water-stained black spots, and the enlarged lesions can form black water-stained patches on the back of the leaves, resulting in the death of corn plants.

In the growth period, booting stage, young ear stage, flowering stage, grain stage, fruit expansion period and early harvest period, spray corn in time with 40% gramsan wettable powder 400 times, or 75% chlorothalonil wettable powder 100 times. After corn harvest to jointing and flowering stage, and after heading to heading stage, spray once each.

Corn pests and diseases should mainly prevent brown spot, corn leaf rust, and aphids, and apply pesticides at different times to prevent pests and diseases. Pay attention to cultivating good plants.

It is necessary to choose excellent varieties for planting, spray pesticides in advance, pay attention to ensure sunlight and temperature, but also ensure the humidity of the soil, and water regularly.

It is necessary to choose the right pesticides for irrigation according to the types of pests and diseases, and should also be watered in time, and fertilizers should be supplemented in time, and then the work of loosening the soil and irrigation should be done, and the dead branches and rotten leaves should be pruned off in time.

First of all, we should choose the right soil, timely watering and fertilization, strengthen water and fertilizer management, spray pesticides regularly, should prescribe the right medicine, and also need to spray some insecticides and sterilization agents, and do a good job in prevention and control.

In the planting of field corn and wheat summer sowing corn interplanting corn, when the corn has seven or eight leaves, armyworm diseases and pests often appear, and if they are not controlled, it will not only affect the yield of corn, but also the rapid spread of pests and diseases. Pests and diseases occur in a single field, and crops within a radius of twenty or thirty kilometers will have different levels of armyworm pests and diseases in a week. The most serious corn seedlings have only one leaf left.

Once we find that there are pests and diseases in the corn field, we need to spray insecticides in time.

Once the corn seedlings show the onset of armyworm pests and diseases, look at the holes of different sizes on the leaves, and the corn seedling core, there are black particles, this phenomenon is the phenomenon of armyworm diseases and pests in corn fields. Corn field pests and diseases should be eliminated in the bud. When the corn seedlings are seven or eight leaves, the car can just enter the ground.

Pesticide spraying vehicles can choose to go to Belle. Herbicides can also be sprayed at the same time. If the corn seedlings are too high, they have to be manually irrigated or pumped to spray.

It is necessary to achieve early prevention and control of diseases and pests in corn fields in a timely manner.

Top rot is a general term for maize tip rot, which is a systematic infectious disease with diverse symptoms. Main diseases: the heart lobe of the victim plant is rotten and tightly wrapped from the base of the leaf, and the whole heart lobe can be pulled out by hand in severe cases, and the heart lobe of the mild plant cannot be twisted; Some leaves lose green, are transparent, brownish and rotten, the leaves are short and incomplete, and the edges of some leaves show notches and yellowing stripes like the front of the knife, and they wilt and die.

Pathogens generally invade from wounds or stem joints, heart leaves and other young tissues, especially after being infested by pests such as fungus horses, Swedish flies, aphids, etc., which will aggravate the onset of disease, high temperature and high humidity are conducive to the prevalence of diseases, and the disease is more serious in the south or field irrigation halls, low-lying or poorly drained plots.

When the corn flowers are beautiful, it also needs a pest control. Ability to choose to hang artificial red-eyed bees. It can effectively avoid the outbreak of corn heartworm.

At the same time, it will also reduce the occurrence of pests and diseases in the field in the coming year. Artificial red-eyed bees should be hung in the field and put in a large area. It is necessary to put it every year to effectively prevent and control the onset of corn fields and pests and diseases.

will appearCorn borer, armyworm, cotton bollworm, aphid, corn leaf mite, etc

In the face of this pest, it is necessary to spray pesticides in time, or learn to hang artificial red-eyed bees in the field, which can effectively avoid the onset of pests and diseases.

Corn rust, root wilting, heading period is relatively short, branches and leaves are yellow, corn large spot disease, these are the main course of disasters, after corn planting timely watering, to ensure enough sunlight, and to spray pesticides and nutrient solution on time.

Corn borers, aphids, ground tigers, cotton bollworms, armyworms, be sure to spray chemicals. Remove the problematic plants in time, strengthen field management, and pay attention to the density of planting.

Spot disease, powdery mildew, armyworm disease, corn borer, corn thrips, these are relatively common diseases, we must pay attention to spraying pesticides on time, choose the right varieties for planting.

<> corn borer, commonly known as corn borer, has a very miscellaneous diet, which can harm corn, sorghum, wheat, cotton, hemp, sugarcane, sunflower, ginger and other crops. Let's take a look at the hazards of corn borer and how to control it.

Corn borer generally occurs in 1 year 2 to 4 generations. The larvae burrow the stem between the stalk and the leaf sheath, feed on the pith, affect the nutrient transport, and the grains of the affected plants are not full, or even have no seeds, and the damaged stems are easy to break. After the heart leaf is bored, the leaf appears to be porous.

Corn borer larvae also burrow into the male inflorescence to feed, causing the base of the inflorescence to break, and also feed on the filaments and tender bracts of the female panicle, and can burrow into the cob or feed on the young seeds. Generally, the yield is reduced by 10 to 20, and the serious can reach 90.

The control time of corn borer should be before the 3rd instar, and the best time is in the big flare stage, and the larvae are concentrated in the heart for irrigation, which is about early and mid-July.

In mid to late June, the occurrence and development of a generation of corn borer in the main spring maize producing areas in northern China had a high meteorological level. In mid to late June, the overwintering larvae of corn borer entered the oviposition stage, and a generation of larvae hatched one after another, and the northern spring corn will also enter the jointing stage, which is a critical period for corn borer control.

1. Biological control of corn borer: it is best to use BT, Beauveria bassiana, red-eyed bee and other biological agents to prevent and control (during the egg-laying period of corn borer, the red-eyed bee is artificially released; At the egg hatching stage, BT wettable powder was sprayed; At the heart leaf stage, Beauveria bassiana powder and fine soil are used to make fungus soil snacks).

2. Chemical control of corn borer: prevention and control at the heart-to-heart leaf stage, and control at the ear stage if necessary. At the heart leaf stage, use phosphine granules or deltamethrin granules or deltamethrin granules or deltamethrin granules snacks, and can also use insecticidal double large granules or Ruijin special mixed sand, and when the corn is threaded 60 at the ear stage, the above-mentioned agents are sprinkled on the leaf axils of the female ear and the two leaves on it, as well as on the spike top filament.

In the young larval stage, 30-50 ml of cyfluthrin EC and 10 20 ml of 10 cypermethrin EC were used per mu, mixed with 50 kg of water to spray the flare, leaf axils and leaf back; At the peak of oviposition or the initial hatching period of larvae, spray with 25 30 grams of 20 30 grams of pyrethuron wettable powder mixed with water.