How to control corn borer in corn? How to buy prevention lights?

Pay attention to the density of planting, pay attention to the condition of the soil, so that you can better prevent and control, try to choose a reliable one, and be sure to pay attention to the brightness, so that you can use it better.

Depending on the phototaxis of the adult corn borer, it can be trapped, using lights such as high-pressure mercury lamps, black lights or frequency-vibration insecticidal lamps. Control lamps can be purchased online or at agricultural supply stores.

You can spray pesticides on time, pay attention to the condition of the soil, and choose the right varieties for planting, so that you can effectively prevent them, and it is also a good choice to buy control lamps.

In the middle stage of corn heart leaves, take Beauveria bassiana and fine sandy soil, mix them in the ratio of kilograms: 5 kilograms, prepare granular agents, and put them directly in corn heart leaves, which can play the purpose of killing corn borer larvae. Another method is to use Beauveria bassiana sealing technology to control corn borer, spraying Beauveria bassiana powder on the residual corn straw before the larvae overwintering in early spring begin to recover, with a dosage of 100 grams per cubic meter of straw stack, which can effectively control corn borer.

First of all, we must spray some pesticides, and we must prune the branches and leaves in time, and we must water and fertilize, and we must observe the production status of corn in time.

It is necessary to spray chemicals in advance, and it is also necessary to monitor in real time, so that the presence of this insect can have a good control effect.

<> 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.

1. Agricultural prevention and control technologyPromote straw returning to the field, or use it as manure, feed, fuel, etc., to reduce the overwintering base of corn borer.

2. Biological control technology:Vigorously promote biological control technologies such as Beauveria bassiana. Beauveria bassiana biological control can be done by using Beauveria bassiana sealing technology (note, this technology needs to be controlled and controlled), or made into Beauveria bassiana granules to be put in the large flare period, both of which need to master the time of delivery to achieve the effect.

3. Physical and chemical inducement and control technologyUsing the phototaxis and chemotaxis of corn borer to make sexual attractants, trapping and killing corn borer adults before laying eggs can effectively reduce the amount of eggs and reduce the harm of corn borer.

4. Chemical control technologyUse the sprinkle chemical agents (such as carbofuran, phosphine, etc.) to kill the heart leaf stage corn larvae, in the corn heart leaf stage, the first and second generation of hatched larvae in the spring and summer corn heart leaves to feed for the damage when the granules are applied, the dosage is 1 2 kg per mu, add 5 times of fine river sand mixed and sprinkled into the bell mouth.

5. Spraying insecticide control technology:At the budding stage of the male panicle, spray with fenvalerate EC or deltamethrin EC. In the intercropping field between wheat and corn, octathion emulsifiable concentrate can also be used to control corn borer.

Corn borer habits:

Adults are diurnal and nocturnal, phototaxis, and have strong ability to fly and spread. Adults mostly emerge at night, do not need to supplement nutrition after emergence, and can mate on the same day after emergence. Male moths have the habit of mating multiple times, and most female moths only mate once in their lifetime.

Female moths begin laying eggs one to two days after mating. Each female moth lays 10 20 eggs, about 300 600 eggs.

After hatching, the larvae first cluster near the egg shell and begin to disperse after about an hour. The larvae have a total of 5 instars, and have glycotaxis, tactile tropism, humidity tropism and negative phototaxis, and like to latent harm. After the larvae are old and mature, they mostly pupate in their harmful places, and a few larvae crawl out of the stalks to pupate.

1. Biological control.

There are many kinds of natural enemies of corn borer, mainly parasitic egg red-eyed wasps, black egg wasps, parasitic larvae parasitic flies, Beauveria bassiana, bacteria, viruses, etc. Predatory natural enemies include ladybugs, walking insects, grass dragonflies, etc., all of which have a certain inhibitory effect on the insect population. The main control methods are the egg killing of red-eyed wasps, the use of Beauveria bassiana to treat the borer and the use of Bacillus thuringiensis to control the borer.

2. Chemical control.

1. Prevention and control of the cardiac lobe stage. At present, the application of pesticides in the bell at the end of the heart leaf stage of corn is still the best pesticide control method to control the first generation of spring maize and the second generation of summer maize corn borer in northern China.

2. Prevention and control at the panicle stage. When the spike rate reaches 10% or there are 50 insects in the spike filament, it should be controlled once in the peak silking period, and the nymph spike rate exceeds 30%, and it needs to be controlled again after 6-8 days.

3. Trapping adult insects.

According to the phototaxis of the adult corn borer, a large number of adults can be trapped. During the occurrence of overwintering adult insects, a water basin trap was set up in 15 hm2 in wheat field with a trap dose of 20ug to trap and kill a large number of male insects, which significantly reduced the control pressure of the first generation.

In the larval occurrence period of corn borer, the ear stage or the whole damage period of corn borer, you can choose to spray the female spike filament with 80% dichlorvos 800-1000 times. Each kilogram of liquid medicine can be sprayed with 500-800 female spikes, or 18% insecticidal double 400 ml plus 80% dichlorvos 200 ml mixed with water 100-120 kg spray.

Corn borer can harm the aboveground parts of corn plants in all growth stages of corn, feed on leaves, ears, male ears, and drill stems. Cause damage to plant growth and decrease of nutrients. The first instar larvae burrow into the heart lobes, leaving many small horizontal rows of holes behind the leaves.

Older people can bite the filaments, stems, and the base of the male panicle can also drill into the cob and eat corn kernels at any time. Corn borer overwinters in the stem, cob and rhizome of the host plant with more than 4 instar larvae. The first key time point is at the seedling stage, such as spring corn, when the first generation of insects begins to move, and farmers can use it together with the insecticide when spraying the corn post-emergence herbicide.

Preventive measures

The second key point is at the corn ear stage, when the ear spraying is the most critical, because during this period, the corn borer larvae have actually begun to gradually transfer to the corn bale. Being able to take the medicine at this time will definitely have the effect of getting twice the result with half the effort. Insect-resistant varieties were selected, and the straw of the main overwintering host crops was treated before overwintering pupation.

For example, manure, used as feed, fuel, etc., corn stalks should be finely crushed to eliminate the source of insects.

Taking advantage of the phototaxis habit of corn borer adults, adults can be trapped, with black light or frequency-vibration insecticidal lamps during the adult growth period. The effective prevention and control area of each lamp is 30-40 acres, and the height of the lamp is set from the ground in meters. In the initial spawning period of corn borer, the red-eyed bee is released, and 1-20,000 heads of celery are generally released in two phases.

Beauveria bassiana was used to seal the stack, and 100 grams of fungus powder were used for each cubic meter of straw stack, and sprayed on the stack before the corn borer pupated.

The specific drug for the control of corn borer is a mixture of dichlorvos and methyl isothion.

The use of this agent can effectively control the number of corn borers, so that corn borers can not be used to kill orange-eating resistant piglets. During the earing period of corn, the use of dichlorvos must be increased, so that the corn borer can die, and the round wang ensures the safety of food, so that the farmers' efforts are not in vain.

The above-mentioned agent can also be applied to the base of the flower column at the top of the female ear, so that the liquid medicine can penetrate into the flower column and kill the larvae in the female ear, so as to reduce the number of corn borer, so as to achieve the purpose of control and improve the yield of crops. According to the phototaxis of the adult corn borer, a large number of adults can be trapped. In the occurrence period of overwintering generation of adults, a large number of male insects can be trapped, and the control pressure of the first generation can be significantly reduced with the Asian corn borer attractant with a core dose of 20ug.

Methods of controlling corn borer

1. Use the phototaxis of corn borer.

Taking advantage of the bug's light-loving trait, the bug flies to the machine to kill the bug. Outside the grange, every 150 meters or so, there is a trap lamp, the adult corn borer has a strong interest in light, as long as there is light, he will definitely go, then the adult corn borer can be killed.

2. Use sex hormones for prevention and treatment.

Because the male and female moths of the corn borer have a clear gender distinction, people can identify their sex very well, so the female can be injected with sex hormones. This practice can make the adult female corn borer unable to get pregnant, resulting in infertility, so that it can not reproduce, and the corn borer can be reduced from the root of the mu.

3. Release the red-eyed bee.

The main food of the red-eyed bee is the corn borer, and for the corn borer, seeing the red-eyed bee is the same as seeing a mouse and a cat. The corn borer's fear of red-eyed bees can be imagined. The red-eyed bee is released during the oviposition period of the corn borer, and the peak is released in a large area on a sunny day, which has the best effect.

The above content refers to Encyclopedia - Corn Borer.