The corn seedlings that have just been unearthed have been bitten off by insects, how should they be

The underground pests that cause damage to corn seedlings include "Spodoptera exigua" (larvae), ground tigers, grubs, needleworms, root bugs, Spodoptera exigua, etc., because the subject did not provide **, only comprehensive control skills can be proposed. Prevention and control method-1 sprinkle poisoned soil. Mu with 500 ml of 80% dichlorvos emulsifiable concentrate, mixed with 25 kg of fine soil, sprinkled along the ridge in the evening on the roots of corn seedlings.

2. Root spraying. Use 2500 times of high-efficiency cyfluthrin emulsifiable concentrate. or 30% acemethamidophos emulsifiable concentrate 1000 times liquid.

<> when buying seeds, you can choose coated seeds for planting, and coated seeds are generally coated with phosphine or imidacloprid, which can prevent underground pests from eating corn seeds. The seeds purchased now are generally coated, and if you don't have them, you can buy a potional for seed dressing. Prevention and control methods:

Irrigation solution, 50% phosphine emulsifiable concentrate per hectare, 750 kg of water along the ridge. It can also be sprayed with 10% imidacloprid wettable powder 3000 times.

Seed dressing, when corn sowing, the seed coating agent is used to dress corn seeds to control underground pests and damage corn seeds. Commonly used pesticides include grassworm line, carbofuran, chlorpyrifos and other pesticides. The number of generations of corn borer occurs every year, and 6 or 7 generations occur in our province a year, and the adult corn borer emergence time is mostly before dawn.

After feathering, mating is carried out in the evening of the same day, and spawning begins the next day, and the spawning time is mostly in the first half of the night. Female moths generally lay eggs for 4 to 5 nights, laying 4 20 eggs.

To prevent and control the harm of corn borer, 1-2 kg of 3% Guangxidan granules can be used per mu, or 1-2 grams of cyanuric fluorochloride granules, 1-2 grams of 14% chlorpyrifos granules, 2 grams of 3% phoxanthion granules, and 1-2 grams of 3% butylsulfur carbofuran granules, sprinkled in the heart leaves. For thrips, straw flies.

3. Corn heartworms, armyworms, planthoppers, leafhoppers, blind bugs, red spiders and other pests should be sprayed after corn emergence, and the first leaf can be sprayed seven or eight days after sowing. Be sure to spray the whole field, not just the corn ridge.

In this case, pesticides should be used to prevent and control it, you can choose to dilute the emulsifiable concentrate to spray the corn, spray more on the roots, and the insects will basically be gone after two or three times, and you will never encounter this situation again.

You can spray some pesticides and let the pesticides kill the insects, so that the corn seedlings will grow again and will not be bitten by the insects.

Apply pesticides in advance, put some pesticides to prevent insect bites, pesticides can kill pests, and can also protect corn from being harmed.

The corn seedlings that have just been unearthed have been bitten off by insects, and they need to be sprayed with pesticides to kill all these insects, and then the grass can be removed so that they can be controlled.

It is necessary to spray some pesticides to prevent insects in advance, and when fertilizing, it should be mixed with some drugs, which can play a good preventive role.

Spray pesticides in time, pay attention to soil moisture, ventilate in time, and dispose of problematic plants in time.

Corn has just sprouted and is eaten by insects, what medicine has a very good effect? There is really no easy and unquestionable answer to such a question. The reason is that there are many kinds of leaf-eating insect pests that may occur at the seedling stage of corn, and the prevention of different pests is not only different in the selection of drugs, but sometimes even very different.

Different pests and diseases are likely to have to choose different drugs, and the right drugs are the best drugs.

1. Corn borer. Corn borer is the most common leaf-eating insect pest in the corn seedling stage, and the hatchling larvae of corn borer usually run to the heart leaves of corn seedlings to feed in groups. When the growth and development of corn heart leaves is in progress, it can be seen that the rows of holes produced by the corn borer damage can be seen.

When mature, corn borer can burer into the stalk or cob of corn.

2. Armyworms. After the corn seedlings are harmed by armyworms, the leaves are fed into notches or holes, and the damage situation is similar to that of corn borers, but armyworms often swallow the heart leaves of corn seedlings, resulting in unintentional seedlings.

3. Cotton bollworm. After the cotton bollworm damages the corn seedlings, not only will there be holes and nicks, but also often bite off the heart leaves of the corn seedlings, causing withering. To prevent the harm of cotton bollworm to corn, the actual effect of applying drugs before the third instar is good.

4. Spodoptera exigua. Spodoptera exigua is socially harmful, and corn seedlings are fed on leaf veins, leaving only milky white skin. Spodoptera exigua, which eats more after the fourth instar, can eat up the veins on corn leaves, leaving only the petioles.

5. Spodoptera litura. Spodoptera litura, which is harmed by a cluster of hatchling larvae, only consumes the veins of corn leaves, leaving petioles and outer skins, so that corn leaves show sieve reticulated flower leaves. After the second instar, the fourth instar insect enters the overeating period, and the leaves can be eaten incompletely, or eaten up immediately.

For the pest control of corn seedlings, it must be detected as soon as possible and dealt with as soon as possible, and at the same time, it is necessary to operate in strict accordance with the relevant spraying process.

I think you can use some drugs that can control pests and diseases, and you can choose mesotrione, which can effectively remove pests and weeds, and ensure the healthy growth of corn.

You can choose some pesticides to repel insects, or you can choose some physical ways to control insects, so that you can better solve the problem.

After the emergence of corn, it is necessary to shallowly tillage and eliminate stubble in time, you can choose some pesticides, and then you should water it in time, and you must prevent water accumulation.

Corn is a very critical crop in China, accounting for a very key influence on the rural economy. Corn has a relatively short growth cycle and high yield, and can be cultivated in many regions of ChinaIn recent years, maize seedlings have large pests and diseases, which are directly related to the growth and development of maize in the middle and late stages, and the production amount. Because the control of corn seedling pests and diseases is very important.

If there are more weeds in the seedling stage of corn, we can choose the composition of nicosulfuron-methyl atrazine, and if the weeds are not serious, we can do without mesotrione. You can use a sprayer to solve the problem when the corn grows to 2-6 leaves. At this stage, Spodoptera exigua, which is also a key control target, you can add emamectin ectectate or perchloroemectectin salts to the herbicide, and at the same time hoeing, it has the control of Spodoptera exigua.

To control ground tigers and mole crickets, ground tigers are key to gnawing the underground stems of corn seedlings. Mole crickets should also feed on young corn stalks and young stems, and the damage to corn seedlings cannot be ignored. The control method is to use 90% crystallized trichlorfon and fried fragrant bran or other bait according to 1:

The ratio of 100 is mixed and stirred evenly to make rodenticide, and at dusk with an amount of less than 20 catties per mu of land, sprinkled in the corn field to carry out prevention and control, which can play a good practical effect. Armyworm, also known as shaving insect and army insect, is a long-distance migrating carnivorous insect pest.

It is very harmful to crops. Prevention and control methods: 50% methamidophos EC, 50% phosphine EC 1000 times, 10% chrysanthemum EC 2000 times to carry out sprayer prevention.

Spodoptera exigua, the larvae are hidden in the straw, and the damage stage is from mid to late June to mid-July. The prevention and control method is to poison with bait, 5kg of fragrant wheat bran and 500 grams of trichlorfon or chlorpyrifos mixed with a little water per mu to make rodenticide and sprinkle it in the corn field at dusk to carry out spraying. Or mix 25kg of fine sand with insecticidal double 300-500 ml, and sprinkle it between corn ridges and seedlings in the morning to carry out control.

To control underground pests, use film-coated seeds, 1 mu with 50% phosphine EC, 200 to 250 grams of fine soil, 25 to 30kg of uniform application along the ridge, or 3%, zinc sulfur and phosphorus tablets, four kilograms, mixed with fine sand and mixed strips to control underground pests. seedlings, one of which is to prevent and control the tooth insect Spodoptera exigua spirogen, improve fertilizer and water management methods, and promote the early emergence of seedlings The second is to use 40% oxygen ocyanide emulsifiable concentrate, 2,000 to 30,000 times liquid sprayer to control corn sprouts and planthoppers, and part of the land that produces Spodoptera exigua, with 40% oxygen lacyanide emulsifiable concentrateHubei Province double liquid or 50% insecticidal double 400 times liquid irrigation roots, to carry out the solution, bud insects planthoppers, can be used acetamiprid, plus pyrida mite, to carry out control.

As soon as the corn seedlings emerge, we should pay attention to the prevention and control of armyworms, mole crickets, needleworms, and ground tigers; It is necessary to use pesticides specifically to control these types of insects, and you can also spray some more targeted insecticides, and at the same time, it is also necessary to ensure that the soil is moist, fertilized reasonably, and exposed to sufficient sunlight.

Small ground tigers, Spodoptera exigua, thrips After the corn seedlings emerge, we must pay attention to the prevention and control of these kinds of insects; You can spray 40 ml of 12% carfenapyr per mu, and then add 30 ml of 22% perchlorofluproxamethoxam, add 30 kg of water to dilute and spray.

When corn is just emerging, it mainly imitates underground pests and leaf bud worms, which are all insects to be controlled when corn is just emerging; If the seedlings are just emerging, try not to spray pesticides, and when they take him into the 3 5 leaf stage, they can spray some drugs, such as nicotinopyl atrazine.

To control ground tigers, this kind of thing has a relatively large impact on the soil and plants, and professional insect repellent can be used.

According to the situation that farmers have reported that corn seedlings have been eaten by insects in recent years, most of them are harmed by Spodoptera exigua, the more wheat straw and wheat bran, the more serious the damage of insects, you can spray the roots with emamectin benzoate at about the five-leaf stage of corn seedlings, spray one ridge at a time, it seems to be very laborious, in fact, it is also very fast, the concentration of the liquid medicine is larger, you can go faster, we use this method every year here, and the effect is very good. Another method is to sprinkle wheat bran along the ridges with methyl ethylphosphon at the three- to five-leaf stage of corn.

They can be destroyed with dichlorvos, this medicine has an effect on many insects, it is a habitual medicine in agriculture, and it can be used several times to complete this task.

The best effect is to use emamectin benzoate cyhalothrin for insect pest control when corn has just emerged, and it can be diluted with purified water and sprayed on the surface of corn seedlings to achieve ideal results.

It is best to use a special plant insecticide and spray it evenly on the leaves of corn. It should not be watered during the medication, otherwise it will have no effect.

There are many kinds of leaf-eating pests that occur in corn seedlings, and to control different pests, it is necessary to choose the right agent in a targeted manner, and the right agent is the best agent.

Initial manpower hoeing. Dig up the weeds with a shovel and shake the soil neatly, throw the weeds in a heap, remove a piece of land, carry the weeds into the wasteland and put them in the wilderness, and clamp them tightly with stones, so that they will not be gently blown back to the field by the wind. In the initial hoeing, the shovel does not have to dig up the corn roots, although this method is time-consuming, but the hoeing is more tidy, and some weeds are completely eliminated.

Fertilizer hoeing. Nowadays, this type of method is widely used in mountainous areas, which has good results and saves construction time.

After the herbicide is purchased, read the instructions for use carefully and drain the diluent as required. When spraying, it is necessary to pay attention to the water mist not to spray the corn seedlings; Pick sunny days and rainy days to carry out, rainy days spraying, precipitation dilution of fertilizer, resulting in consumption. Nowadays, there is a chemical fertilizer, which is effective on weeds, and is not harmful to corn seedlings, so it can be sprayed casually.

But in fact, the corn seedlings may suffer varying degrees of damage, and it is recommended or best not to spray them on the corn seedlings. The first thing to pay attention to is the herbicide after the bud seedlings, 3 to 5 leaves of corn seedlings is the best time to spray, and 2 to 4 leaves of wild weeds.

If the spraying time is not very much, it is best to spray after 6 pm, because the spray temperature is getting cooler and cooler, the medicine is not easy to evaporate, and the medicine can improve the power. If there are more species, you can also choose these two time frames before 9 o'clock in the morning. The damp and cold medicine in the field is also high.

When hoeing after corn seedlings, when you take the medicine, you should distinguish the type and do not blindly take the medicine, because most of the herbicides after the bract seedlings are nicosulfuron, and some corn seeds are more sensitive to this component.

It is easy to produce important, and some commodities are marked that it is strictly forbidden to apply it in bud inbred lines, corn, waxy corn and other species. The weeds in the corn field should be sprayed in the growth period when the weeds are the most sensitive to herbicides and the buds are the most resistant to herbicides, so as to improve the control effect and ensure the safety of seedlings. The bract rice is most sensitive to herbicides before the budding stage and the 4-leaf stage, which is easy to cause fertilizer damage, and the use of herbicides in this pregnancy link needs to pay attention to the content of the drug.

The corn seedlings in the field have been bitten off a lot, and if it is serious, it will have to be replanted. If you want to solve the situation of corn being bitten, the best way is to spray insecticides and pesticides when the corn is three or four leaves to prevent being bitten.

You can use some anti-pest medicine to prevent and control this phenomenon, and it may be effective to add a little fertilizer.

Replanting can be carried out, which should be determined according to the specific growth of the corn, and the density of the corn can also be changed.

Many farmers in the north will turn the ground to dry the insecticidal body in the spring, or use pesticide treatment to ensure the growth of corn. Or choose a series of varieties that are resistant to pests and diseases, choose coated seeds, plant them reasonably densely, and water them at the right time.

Corn is coated with pesticides or mixed before sowingBefore corn sowing, you can choose to use 30% cypermethrin seed coating agent to coat corn seeds directly, or you can choose 40% phosphine emulsifiable concentrate liter with 20 liters of water, and 200 kg of seed dressing.

After sowing and emergence, when a small number of plants are damaged, pesticide irrigation is carried outThe optional agent is 48% chlorpyrifos EC 2000 times, or 40% phoxanthion EC 1000 times.

The corn worm bites off the corn, and without the top of the corn, how can it grow normally, or even grow, it will sprout from the bottom of the corn and grow again, so the corn has almost no chance to tassel. It is advisable to encounter such a situation, give it up directly, and then re-seed.

Because the year before last with us, this happened and many families had their corn bitten off by insects, and the resort was to plant it directly from scratch. How to solve the problem of corn gnawing? The best way to deal with corn bites is to spray insecticides when the corn has grown to three or four leaves, so that corn drill worms will no longer invade the corn and corn bites will not occur.

In conclusion, if a large area of corn is chewed, the best remedy is to replant the corn, because chewed corn, no matter how managed, will never grow a cob again. Soil treatment was carried out before sowing on plots where grubs were severe. The specific method is to use 4-8 kg of 3% phoxanthion granules per mu, or 200 grams of 50% phoxanthion emulsifiable concentrate per mu, dilute it with water and mix 15-20 kg of fine soil to make poisonous soil and sprinkle it for ploughing, and then sow corn.

<> this insect has a dirty white body, about 2 cm long and 1 cm thick, fat, crumpled and curved in a "C" shape. Therefore, in order to avoid the harm of underground pests, it is necessary to do a good job in the prevention and control of underground pests first. Only prevention and control can prevent problems before they occur.