Spring corn borer is extremely harmful, what are the prevention and control methods of spring corn b

To use professional herbicides and insecticides, we should also do a good job of prevention, the temperature of planting should be controlled at 18 degrees to 22 degrees, we must do a good job of pruning branches and leaves and weeding, we must do a good job of cold protection, we must do a good job of ventilation, we can lay mulch film in the greenhouse, and we must water and fertilize in time.

The control methods of spring corn borer include chemical control and biological control methodology, the control method is to spray some chemical agents to kill them, and the biological control method is to introduce the natural enemy of spring corn borer in the field, which can effectively inhibit the growth and reproduction of spring corn borer.

Choose a good variety for planting, but also spray some suspension. To grasp the best time for control, it is necessary to kill pests and diseases in time, and also remove problematic plants in time.

Be sure to spray organic fertilizer in time, remove problematic plants in time, use some pesticides for treatment, and spray insecticides appropriately. It is necessary to maintain the drainage of the soil.

Corn borer is the most common occurrence on corn, the most serious damage, the most difficult to control a pest, can eat corn leaves, ears, male ears, borer stems, seriously affect the growth and development of corn plants, resulting in a reduction of 10-30% of yield, every year in the control, the effect is not ideal. So how to control corn borer correctly and scientifically?

After the corn heartworm borrows the corn stalk, it causes very bad harm to the growth and development of the corn plant, and it is very easy to break in windy weather, and causes seedlings to fall, affecting the production of corn. The heartworm harms the male ear and the corn pollination, and the bee pollen is significantly reduced due to the damaged area, which harms the female ear and the seed is pollinated sufficiently, and the lack of seed grains occurs.

The larvae of the corn borer can harm the filament of the female ear, bite off the filament, will harm the pollination of corn, and will drill into the flower ear, gnaw the corn kernel, discharge the fecal sewage, pollute the flower ear, and the damaged corn kernel is moldy, resulting in a decrease in the quality of corn, a decrease in production, and the young larvae harm the young position, and the larvae above the 3 or 4 instars will drill the stem and the flower ear will be harmed.

Corn borer worm in the north and south of China corn production areas are harmful, the north and south of the country occur in the same generation, the whole year occurs 1 6 generations, the temperature in the south is high, the occurrence of analytic geometry is more, the main corn production areas in the north generally occur 1 2 generations, Shandong Province, Henan Province, Jiangsu Province generally occurs three generations a year, mainly occurs at the end of spring to the corn harvest, and there are no old mature larvae that have not been masked, hidden in the corn stalk under the condition of suitable temperature pupation mask.

Corn borer control, to grasp the corn borer of the young larvae of the application of chemical fertilizer, the third instar before the corn borer, mainly in the corn bell mouth stage to harm the heart leaves, grasp this stage to carry out control, can have the actual effect of half the effort.

There are many drugs used for corn heartworm, you can choose phosphine granules, chlorantraniliprole tablets, folk alias this tablet is called "gravel medicine", lose hearts one by one, the effect of preventing and controlling corn heartworm is very good, and the effective period is long, the only defect is time-consuming and time-consuming.

The natural enemy of the corn borer is the red-eyed bee, the red-eyed bee mainly lays eggs in the eggs of the corn borer, to reproduce the purpose of the offspring, and the use of the red-eyed bee to control the safety of the corn borer, no damage to other natural enemies.

In the early stage of corn borer, 1000 times of 5% chlorantraniliprole suspension can be used to spray the first time in the large bell mouth stage of picking corn, and then spray the second time at an interval of 7 days, and then spray the third time at an interval of 10 days, which has a very good effect on the control of corn borerworm. You can also use 500 times liquid emamectin fenapyr + 500 times liquid lice mites to carry out control, and the actual effect is also good.

The use of corn straw returning to the field, the first corn straw returning machine, the crushed corn straw is very broken, there is no feathering of the old mature larvae, in the process of returning the straw to the field is broken by the crusher, destroying the wintering place of the pest, which can greatly reduce the overwintering base of the corn borer and reduce the occurrence of corn borer in the second year.

1. Occurrence rules and hazards. The larvae only harm the heart leaves, causing "mosaic leaves", and then burrow into the male ears to feed when the corn buds, and some 4 5 instar larvae burrow the ear stalk or the female ear and the nearby stem to eat and cause breakage. It is very important to do a good job in the prevention and control of the end stage of the heart lobe to reduce the damage of borer.

2. Prevention and control time and standards. The end of the heart leaf and the peak stage of silk extraction of corn are the appropriate periods for the control of corn borer. There are two ways to determine the end of the heart lobe, one is to pinch the base of the corn horn by hand, and the front end of the male bud can be felt, but when the male ear bud is not visible from the bell mouth, it is the end of the heart lobe.

The second is to pull out the leaves that are still rolled into a cylindrical shape in the bell mouth for autopsy, such as peeling off 4 or 5 leaves to see the male panicle, that is, the middle stage of the heart leaf; After peeling off 2 3 leaves, the male spike is at the end of the heart lobe.

3. Prevention and control measures. First of all, the overwintering host straw, root stubble, cob, etc., should be treated, especially before the emergence of overwintering insects in spring. It is an effective way to reduce the occurrence of corn borer by means of burning, guillotine, dipping, and drug sealing incision to reduce the number of insect sources.

At the end of the corn heart leaf, the corn borer bites the unheart leaf, resulting in the "mosaic leaf" shape, and the general treatment is carried out when the mosaic plant rate reaches 10%.

Environmental factors: The physiological habits of corn borers determine that they like high temperature and high humidity environmental conditions, so generally 7 9 is in the high temperature and rainy season, and the disease is more serious; Even in some areas, corn borer damage occurred in June. In terms of temperature and humidity, the temperature is 22 28 ° and the relative humidity reaches about 60%, which is the most suitable for the development of corn borer.

Adult eggs and hatching are most vigorous at a relative humidity of about 90%. In the corn growing season, it can just meet the temperature and humidity conditions of corn borer; This has led to the high incidence and common occurrence of corn borer. Planting Factors:

Affected by different sowing dates, the harm of corn borer is also different. If the heart-leaf stage of corn is at the peak of adult egg laying and larval hatching; Then the severity of the damage can be expected. At the same time, the mixed planting mode is often more serious than that of monoculture. Reducing the planting area of spring sowing and expanding the planting area of summer sowing can effectively reduce the damage of summer maize.

Insect population base: The size of the overwintering insect source base is directly proportional to the number of eggs laid in the field and the number of damaged plants. The large base of insect population, the more the overwintering base, will also affect the degree of damage of corn borer in the coming year.

The occurrence period of corn borer is at the summer corn ear stage, and the plant is tall and not easy to be applied, which makes the occurrence of corn borer at the ear stage have a tendency to aggravate and aggravate the occurrence of ear rot. The control technology of corn borer has been relatively mature, through the planting of insect-resistant varieties, the use of red-eyed bee, Beauveria bassiana, BT granules and other biological control, frequency vibration insecticidal lamp light trapping and other physical control, insecticide spray or granule filling and parasitic agent irrigation can be controlled.

1. Reasonable dense planting: according to the planting season, variety, height and length of growth period, 3000-3500 plants are planted per mu.

2. Strengthen fertilizer and water management, increase potassium fertilizer, and avoid excessive nitrogen fertilizer and insect recruitment.

3. Appropriate control: It is advisable to carry out pesticide control before the third instar of larvae.

Strengthen fertilizer and water management, increase potassium fertilizer, avoid excessive nitrogen fertilizer and attract insects, it is advisable to carry out pesticide control before the third instar of the larvae, and spray or irrigate 100 kg of 50% badan with water per mu or irrigate in the heart leaves.

Fertilizers can be added, pesticides can also be sprayed to prevent pests and diseases, and weeding should be done frequently, and the environment should be kept hygienic, these are all ways to control borers.

The method of prevention and control is to see the sun frequently, and to water and fertilize in time, so as to avoid the occurrence of these pests and diseases, and in the process need to spray a large number of pesticides.

Spray some chemicals with a certain concentration. In this way, the pest can be eliminated without affecting its quality.

<> corn borer will bury through the corn heart leaves, when the corn leaves can see rows of neat holes, and when the corn pulls out the male ears, the corn borer larvae will burrow into the male flowers to harm, and the base of the damaged male flowers is easy to be broken. Some larvae will bury into the stems and feed, the damaged stalks are easy to be blown by the wind, and when the plant is damaged, it is usually prone to premature senescence, the kernels are not full, and some ears even have no grains, resulting in a serious reduction in yield.

1. Harmful symptoms of corn borer

1. Corn borer larvae belong to boring pests, they will bury corn heart leaves, and after the corn leaves, you can see rows of neat holes.

2. After the male ear is extracted, the corn borer larvae will burrow into the male flower to harm, which will cause the base of the male flower to be broken.

3. Some larvae will bury into the stems and begin to feed, and after strong winds, the damaged stems will be easily blown off. The affected plants usually have not full grains and are prone to premature senescence, and some ears even have no grains, resulting in a serious yield reduction.

Second, the control method and control time of corn borer

1. Biological control.

1) When the corn borer begins to lay eggs, the initial peak of egg laying, and the peak of egg laying, you can put the corn borer red-eyed bee 3 times to destroy the eggs.

2) At the heart-leaf stage, mix the slag granules with Beauveria bassiana (50-10 billion conidia per gram) 10-20 times, and then sprinkle them into the heart-leaf bush to eliminate corn borer, with a dosage of 2g per plant.

2. Pharmaceutical prevention and control.

1) At the end of the heart leaf, you can use 250g of Kill Molin No. 1 granules, mix 3-4kg of fine sand, and sprinkle it into the heart leaf according to the dosage of 1g per plant for control.

2) After corn earing, 50% phosphine, or 40% hydroamidophos emulsifiable concentrate 1000 times liquid can be sprayed or dropped on the top of the female ear, the leaf axils of several leaves above and below the female ear, which can usually effectively protect the female ear from insect pests.

3. Agricultural prevention and control.

1) After the autumn harvest or before April in spring, clean up the weeds, eliminate the overwintering larvae hiding in the weeds, and reduce the number of insect sources.

2) The phototaxis of adults can be used to trap and kill at night using black lights, high-pressure mercury lamps or frequency vibration lamps.

<>1. Prevention and control during the overwintering period: before the end of April, the corn stalks and cobs will be burned, or processed and crushed as feed, and the overwintering hosts of corn borers, such as Xanthium, will be removed at the same time. 2. Prevention and control of the cardiac lobe stage

At the end of the heart leaf, if the mosaic rate of corn borer is 10, mix it with phosphine granules in a ratio of 1:15 with fine cinders, and then sprinkle it into the bell mouth. 3. Biological control:

At the beginning, peak and end of egg laying, 1-30,000 red-eyed bees are placed per mu.

1. Corn borer control methods

1. Prevention and control during the overwintering period.

Most of the corn borer larvae will overwinter on the corn stalk and cob leaves, and pupate in them the next spring, so according to this characteristic, the corn stalk and cob can be burned as fuel or processed and crushed as feed before the end of April, and then the overwintering host of the corn borer, such as Xanthium and other weeds.

2. Prevention and control of the cardiac lobe stage

After entering the end of the heart leaf stage, if the mosaic and leaf rate of corn borer feeding reaches 10, or after the summer and autumn corn enters the silking stage, the ear rate reaches 5, can be mixed with phosphine granules and fine cinders in accordance with the ratio of 1:15, and then sprinkled into the bell mouth, or can be perfused with medicinal solution.

3. Biological control:

At the beginning, peak and end of corn borer oviposition, red-eyed bees are released respectively, generally 1-30,000 can be placed per mu, and 2-4 bee points can be set up per mu. The specific method is to roll up the egg card with corn leaves, and the egg card can be 1 meter high from the ground. The red-eyed bee has a more obvious effect in eliminating corn borer, and the control cost is low.

4. Use microbial pesticides.

The use of microbial pesticides such as bacillus borer and Beauveria bassiana can generally be mixed with 1000-2000 liters of water with 1 kg of bacterial powder containing more than 10 billion (per gram) of spores, and then the heart leaves are perfused; Or it is prepared into fungus soil, granules to use, fungus soil can generally be prepared with 1 kilogram of bacillus borer plus 100-300 kilograms of fine soil or furnace ash, if it is prepared Beauveria bassiana powder granules, it can be prepared into about 20 times, and about 2 grams per plant can be applied.

Second, the symptoms of corn borer

1. The larvae of corn borer belong to boring pests, and the typical symptoms caused by them are that after the heart leaves are bored, neat rows of small holes will appear in the corn leaves.

2. When the corn is drawn out of the male ear, the larvae of the corn borer will drill into the male flower for damage, which will generally cause the base of the male flower to be broken, and some larvae will be bored from between the stem and leaf sheath into the stem, feeding on the pith, resulting in the stem being easily blown and broken after encountering strong winds.

3. The grains of the affected plants are not full, and the ears of some fruits will not even bear grains, resulting in a serious reduction in yield.

The effect of corn borer on corn seedling stage is relatively small.

Corn borer (corn borer) control methods

Prevention time

Corn borer can affect the entire growth period of corn, whether it is spring corn or summer corn, and can be sprayed to control young larvae at the seedling stage of bright corn.

Corn seedlings 6 leaves, and then spray again to control the heart worm. Corn grows to waist-high and is a critical period for the prevention and control of corn borer affecting male ears during the big flare stage. Corn grows to the ear stage, and it is a critical period for the prevention and control of corn borer, and the ear spraying can greatly reduce the control effect of corn borer worm with half the effort.

The control of corn borer should be mastered in the early larval stage, which can achieve twice the result with half the effort.

Prevention and control agents

In the corn seedling stage, corn borer larval occurrence stage, 8 ml of chlorantraniliprole suspension, 20 ml of lice mite urea suspension, mixed with 15 kg of water, can be sprayed on the whole corn seedlings. When corn seedlings grow to the big flare stage, it is best to use zinc sulfur granules or BT insecticide granules, and then throw the corn heart, which can concentrate on the control of corn borer larvae hiding in the heart leaves, and the effective period is very long. It can also be sprayed with 1000 times of cyhalothrin + 25 grams of emamectinethcarb suspension agent mixed with 15 kg of water at the corn flare stage, which has a good control effect on older borers.

Beauveria bassiana spore powder for the control of corn borrower, prepare 1 kg of Beauveria bassiana spore powder, and 10 kg of briquette ash after incineration, mix evenly, and throw it into the corn heart leaf at the corn horn stage, which has a good control effect on the larvae of corn borrower.

Auxiliary prevention and control methods

Corn borer adults, phototaxis, especially the trend of black light is stronger, the black stuffy only wide light hanging to two meters high, it can attract about 35 acres of corn borer adults, can be concentrated control, in addition, the selection of corn varieties with strong resistance to diseases and pests also have a certain effect on prevention.

Corn borer worm is one of the very serious pests of corn, corn borer is also called corn borer, as long as it is planted corn, basically every year, with the expansion of corn planting area, corn borer also has a tendency to aggravate the impact, corn stalk through the bite of the kernelworm, will cause corn lodging aggravation, and even affect the normal ear setting of corn, corn empty pole rate increases, after the insect infestation corn ear, the grain of corn ear is polluted, which will have a very great impact on the yield and quality of corn.

Corn heartworm mainly feeds on the leaves of the aboveground parts of corn, corn cobs, corn tassels, corn stalks, etc., which can affect the entire growth period of corn. After hatching at the seedling stage, the larvae burrow into the heart leaves to feed on the young leaves, and the damaged corn grows leaves with transverse holes, and the older larvae eat the stems, corn cobs, corn kernels, corn ears, cob filaments, etc., which will cause a lot of corn yield reduction.