How should wheat aphids be controlled? Is it necessary to prevent it?

The best time for aphid control is generally in mid to late April, and early to mid May for wheat in the north. During the wheat heading period, wheat aphids are found to be controlled with pesticides, and cyhalothrin or imidacloprid can be sprayed with water to kill aphids. Generally, it cannot be sprayed during the flowering period, which affects the yield of wheat.

Wheat aphid is vegetative reproduction, overwintering in straw and weeds in winter, in the prevention and control of crop straw to crush and return to the field, buried deep in the soil, let the straw naturally ferment to kill the aphid eggs. Before sowing, the weeds should be removed, the weeds in the wheat field should be sprayed with herbicide, and then the rotary tillage should be deepened so that the aphids cannot overwinter.

Aphid is a major pest that harms wheat, the most serious harm to wheat is the ear aphid, the ear aphid from late April to early May, began to harm the wheat, the first to start behind the leaf cluster damage after heading, into the panicle between the grains, suck the juice to make the leaves dry up early, seriously affect the wheat yield, serious, up to more than 50%, the people have a sentence not to treat the wheat aphid fertilizer white saying, the prevention and control of wheat aphid, mainly in May, the control of wheat aphid must be diligent observation, early prevention and control, you can choose to use related agents, Combined with the prevention and control of wheat armyworm, a single discovery, should be sprayed in time, spraying the nozzle upward, spraying should be thoughtful and meticulous, can not be missed spray, must be treated early and small.

Aphids belong to asexual reproduction, as long as the temperature and humidity reach the right conditions, the reproductive ability of aphids is still very strong. Aphids reproduce quickly and have strong drug resistance, so they must be prevented and controlled as early as possible. In April, it is necessary to prevent it in advance, and you can use high-efficiency cyhalothrin plus insectoprid for wheat field spraying, and use two buckets of water per acre of land.

When preparing the land, it is necessary to pay attention, especially for planting corn on the stubble, because now the straw should be returned to the field, so if it is not thorough, it will leave a good growth environment for the aphids to survive the winter, and there is a weed pile on the side of the road, which is also a good place for the aphids to live, and when the spring comes, the temperature will reach their breeding period, and there will be a large-scale outbreak.

Wheat aphids, also known as greasy insects, are one of the important pests in wheat production. It is harmful to suck after heading, resulting in insufficient grain filling, incomplete grains, and decreased grain weight, resulting in reduced yield. In addition, wheat aphid is an important insect vector for the transmission of plant virus diseases.

Comprehensive prevention and control mainly includes the following aspects:

1.Agricultural control: select varieties resistant to wheat aphid; Grass spring rake pressing, weeds removed.

2.Protection and utilization of natural enemies: Attention should be paid to improving pesticide application technology, selecting safe selective agents, reducing the number and quantity of drugs, and protecting natural enemies from harm.

3.Pesticide control: the wheat heading-filling stage is the peak period of wheat aphid spike damage, and pesticide control is the main measure to control wheat ear aphid. The control index is that when the rate of aphids at the panicle stage reaches about 50% and the number of 100 aphids reaches about 500, pesticide control should be organized immediately.

Some pesticides should be sprayed in advance during the season when wheat aphids are prone to appear, of course, they need to be controlled, and once wheat aphids appear, they will reduce wheat yields.

In the process of planting wheat, it is very necessary to prevent aphids, we should pay attention to cultivating excellent varieties, and pay attention to field management during the growing period, reasonable fertilization, and pesticides should be used if there are aphids.

Wheat aphids are no strangers. Also known as wheat aphids or ears, they usually first gather on wheat leaves and begin to harm plants when weather conditions are right and multiply rapidly in the middle and late stages of wheat growth. The occurrence of aphids after wheat heading is more serious, affecting wheat filling, egg growth is not good, spreading diseases, and seriously affecting wheat yield.

Are wheat aphids getting harder? I'll teach you a recipe that kills insects quickly and works well. Very practical first, why do wheat aphids occur a lot?

On the one hand, due to the weather, the warm winter weather was suitable for the occurrence of aphids, and the temperature gradually increased after wheat heading, and the weather conditions were also conducive to the occurrence of aphids.

Some plots have almost no pests, which are mainly related to management, do not prevent in advance, and also occur in large areas in the later stage, which can cause a pandemic of viral diseases in severe cases. Now why are wheat aphids getting harder and harder**? First, wheat is in its second trimester.

In order to save work, some farmers hit a bucket of water on 1 acre of land, which could not penetrate evenly, and the mites on the spike got **, but the lower stem would reproduce more than the upper spike. Second, due to the inappropriate time to apply the medicine, some farmers go to take the medicine when they see others taking the medicine, and usually start taking the medicine after entering the booting stage. Third, the prophylactic agent is too single.

For example, the first time you go back to use mites, the second time you go back or mites, so that there is constancy.

Choose disease-resistant varieties when planting, mix seeds with mites before sowing, water moon hole water and recharge water to inhibit the harmful effects of aphids. In addition, it should be noted that in order to have a better preventive effect, farmers must choose the appropriate agent and administer it at the appropriate time. Direct Danger:

It causes direct damage to the wheat itself, attaches to the leaves, stems, and ears to absorb the juice, resulting in leaf yellowing, growth arrest or white ears, especially in severe cases, the whole wheat will wilt and die. Indirect danger: Aphids, as the transmitters of some viral diseases, will cause the onset of viral diseases, causing harm to wheat and other wheat, such as wheat yellow dwarf disease, the growth trend of wheat is relatively low after the occurrence, and the most important transmission route is aphids.

Aphids have an impact on the final yield and quality.

Wheat aphids usually spend the winter in the form of eggs in wheat straw, weeds, soil joints, etc., and begin to damage when the temperature is right the next year. According to the topography of our country, the northward movement is becoming more and more serious under normal circumstances. In addition, if the wheat field is sown early, it will lead to the early occurrence of mites and large losses, and secondly, affected by weather factors, the temperature in the early part of the year is low, rainy, and the temperature is high in the later period, and the mites will also break out in a large area.

How to prevent and prevent wheat aphids? How can I improve the effectiveness of prevention**? A combination of strategies for wheat aphids, combining prevention and prevention, can yield good results.

When choosing to buy seeds, varieties with strong insect resistance are more suitable, and if the allegiance is the same, varieties with strong insect resistance may have certain advantages, which can resist the invasion of some aphids on their own, which is more conducive to the normal growth of wheat.

Wheat aphids mainly include wheat long-tube aphid, millet aphid and wheat bifurcated aphid. There are hazards from wheat seedling stage to panicle stage, and the panicle stage hazard has the greatest impact on yield. When the aphid plant rate reaches 40% 50% at the seedling stage, the average number of aphids per plant is 4 5 when the control is carried out, when the ear rate of aphids reaches 15% 20%, and each plant has an average of more than 10 aphids for control, you can use 25% cyanide dimethoate 50 ml mu or 25% cyanide pentathion 50 ml mu, you can also use 40% oxidized dimethoate 50 ml mu combined with the control of wheat armyworm spray on water 50 kg spray or water 20 kg fog.

Single control of wheat aphid can be selected with 50% anti-aphid wettable powder 6 8 grams 10 20 grams of water spray or mist.

Agricultural control according to the variety and soil fertility, sowing reasonable arrangement of sowing amount (before sowing with new high-fat film dressing), postpone the sowing date, control the group should not be too large, increase phosphorus and potassium fertilizer, reasonable fertilization and watering, strengthen field management, promote the growth of wheat, spray Zhuang Suiling at the booting stage of wheat to strengthen wheat physiological function, enhance insect resistance.

1. Seed treatment: before sowing, the seeds are treated, which is labor-saving, time-saving, economical and efficient, and is the best control method. 2. Soil treatment:

When wheat is sown, the soil is also treated. 3. Early prevention and control: In the wheat regreening, jointing and heading stages, it is necessary to check in the field regularly.

Aphids harm wheat, reduce yield, spread diseases, absorb wheat nutrients, weaken photosynthesis, and affect growth and development after spreading diseases. Agricultural planting nets.

Wheat seedlings are easy to recruit insects, at this time you can properly spray insect control drugs, so that wheat seedlings grow better, aphids will cause wheat seedlings to grow slowly, will mature later than other crops, will make the wheat harvest bad, will reduce the yield of grain, must be in the wheat seedling period to control the control of aphids.

In the process of planting wheat, it is necessary to mix wheat seeds with fertilizers accordingly, and during the germination of wheat, it is necessary to spray pesticides, deal with the surrounding dead branches and weeds in time, do a good job in field management, loosen the soil, water in time, and maintain sufficient sunlight. Tooth decay is devastating for the growth of wheat, which may delay the heading period of wheat seedlings, reduce yields, and turn the wheat stalks yellow.

Wheat aphids are infested by adults and nymphs sucking sap on wheat stems, leaves and ears. The damage is light yellow spots, and in severe cases, the leaves are yellow. From the emergence of wheat to maturity, wheat aphids are harmed.

However, the losses caused by different growth periods are very different, and the degree of damage caused by different aphids is also different.

Plants will have rotten roots, pests and diseases, yellowing of leaves, plant death, and wheat insects. When we encounter this situation, we can use the way of turning the soil, spraying insecticides, spraying pesticides, spraying nutrient solution and watering to prevent and control.

There are many natural enemies of aphids, including ladybugs, aphid-eating flies, parasitic wasps, aphid-eating gall mosquitoes, crab spiders, lacewings and entomopathogenic fungi, etc., which have a strong inhibitory effect on aphids. Broad-spectrum pesticides can be applied as little as possible, and pesticides can be avoided during the peak period of natural enemy activities, and aphid natural enemies can be artificially raised and released if conditions permit.

1. Protection of natural enemies: There are many natural enemies of aphids, including ladybugs, aphid-eating flies, parasitic wasps, aphid-eating gall mosquitoes, crab spiders, lacewings and insect pathogenic fungi, etc., which have a strong inhibitory effect on aphids. Therefore, broad-spectrum pesticides can be applied as little as possible, and at the same time, they can be avoided during the peak period of natural enemy activities, and aphid natural enemies can be artificially raised and released if conditions permit.

2. Artificial control: whitening at the base of the trunk in autumn and winter to prevent aphids from laying eggs. 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 dense overwintering egg masses on the bark, and clean up the residual branches and leaves in time to reduce the overwintering insect eggs. When a small number of aphids are found on spring flowers, you can brush them with a brush dipped in water.

3. Drug control: spray pesticides in time when a large number of aphids are found, spray plants 1 2 times with 50% marathon emulsion 1000 times, or 50% pine borer emulsion 1000 times, or 50% anti-aphid wettable powder 3000 times, or deltamethrin emulsion 3000 times, or 3000 times of exterminating emulsion, or 1500 2000 times of 40% imidacloprid aqueous solvent, etc.

What are the special drugs for wheat aphids?

1. Anti-aphid. Anti-aphid is a highly selective aphidicide, with contact killing, fumigation and foliar osmosis, which can effectively control all aphids except cotton aphid, and is also effective against aphids that are resistant to organophosphates. The insecticide is rapid, but the residual effect period is short.

It is an ideal agent for crop safety, no harm to natural enemies, and comprehensive control.

2. Deltamethrin. Deltamethrin is one of the most toxic pyrethroid insecticides, and has a good killing effect on cotton bollworm, red bollworm, cabbage worm, diamondback moth, Spodoptera litura, tobacco worm, leaf-eating beetle, aphid, blind tsubaki, tsubaki, leafhopper, heart-eating worm, leaf miner, stinging moth, caterpillar, inchworm, bridge-building insect, armyworm, borer, locust and other pests.

3. Malathion. Malathion is a yellow oily liquid, slightly soluble in water, soluble in a variety of organic solvents. It is a high-efficiency, low-toxicity, broad-spectrum insecticide and acaricide, which has contact killing, stomach toxicity and certain fumigation effect on pests, no systemic properties, and a short residual effect period, and the general efficacy is 7 days.

It is effective for the pests of stinging and sucking or chewing door device, and is suitable for the prevention and control of foliar pests of fruit trees, vegetables and other crops, as well as sanitary and storage pests, with low toxicity to humans and animals, and highly toxic to bees and fish. Small.

Scattering plant ash can cure aphids.

When selecting seeds, we must choose high-quality people, and we must ventilate more, fertilize more, and we must water more to maintain humidity.

Some pesticides can be sprayed. Pesticides can kill pests on wheat.