The occurrence law of Spodoptera exigua, and how to control Spodoptera exigua

Spodoptera exigua, belonging to the family Spodoptera exigua, occurs to varying degrees in Hebei, Shandong, Henan, Shanxi, Jiangsu and Anhui summer maize areas. With the growth of larval age, the amount of food increases, and if it cannot be controlled in time, it will cause serious lack of seedlings and break the seed, which will affect the yield of maize.

1、You can mix 8-10 kg of wheat bran with 150 grams of water and 8-10 kg of wheat bran per mu, sprinkle along the corn ridge, or use 4-5 kg of fried wheat bran per mu or fried cottonseed cake after crushing, and sprinkle 90% crystal trichlorfon with a small amount of water next to the corn seedlings, and wait for the night after the eiguaci comes out to eat.

2. Mix 25 kg of fine soil with 300-500 ml of 80% dichlorvos emulsifiable concentrate per mu, and sprinkle it on the edge of the corn seedlings along the ridge in the morning, and the control effect is better.

3. With water irrigation, use 1 kg of 50% phoxanthion EC and 48% chlorpyrifos EC per mu, and pour them into the field to kill Spodoptera exigua.

4. You can also use 4% perchloremamectin benzoate diluted 1000-1500 times for spray control, the amount of water should be sufficient when applying, and the whole field spray should be carried out on the surface of corn seedlings and fields, and the base of the corn stem and around the spraying should be focused on spraying.

Second, when is the control effect of Spodoptera exigua good?

The prevention and control of Spodoptera exigua should adopt the principle of early treatment and small treatment, and it is better to control and control corn before it emerges.

3. The reason why Spodoptera exigua is refractory to treatment.

1. Spodoptera exigua hides under the damp broken wheat straw during the day, and will only come out at night, and it is difficult to spray the agent on the surface of the insect body, so it is difficult to kill the pest.

2. Because Spodoptera exigua is mainly a larval hazard, hiding under broken wheat straw during the day, it is not easy to be found, coupled with the concept of heavy treatment and light prevention, the prevention and control of Spodoptera exigua, which leads to the increasing degree of harm.

3. The wide application of large agricultural machinery such as harvesters, a large number of wheat straw residues in the field, provide favorable conditions for the reproduction and development of Spodoptera exigua, and at the same time bring difficulties to the prevention and control.

Corn insect infestation is serious, and Spodoptera exiguas are here again, how to prevent and control them?

Spodoptera exigua, is the main pest that has begun to invade corn fields in recent years, because of its infestion parts and morphological similarity with ground tigers, many farmers are accustomed to call Spodoptera exigua, mistakenly called Spodoptera exigua. To control the damage of Spodoptera exigua, cyhalothrin + emamectin benzoate can be sprayed in the evening.

1. Agricultural control: plough the soil in winter, use low temperature to eliminate the source of overwintering insects, and usually need to clean up the mulch on the base of corn seedlings to destroy the living environment of Spodoptera exigua. 2. Chemical control:

Usually, 1500 times of 48% chlorpyrifos emulsifiable concentrate, or 1000 times of 30% acemethamidophos emulsifiable concentrate can be used to sprinkle irrigation to control Spodoptera exigua, and 150g of gram borer can be used per mu to add 2 kg of water to mix 8-10 kg of wheat bran, and then make it into a poisonous bait and then sprinkle pants along the ridge for control.

1. The prevention and control methods of Spodoptera exigua

1. Agricultural prevention and control.

1) There are generally wheat straw, weeds and other mulches on the base of corn seedlings, and these mulches should be cleaned up in time to not create a suitable environment for Spodoptera exigua.

2) When the corn planting is finished, the straw and weeds in the field need to be cleaned up in time to reduce the probability of insect pests.

3) In winter, it is necessary to plough the land reasonably and use low temperature to eliminate the source of overwintering insects.

2. Chemical control:

1) Add 2 catties of water with 150g of gram borer per mu, mix 8-10 catties of wheat bran to make poisonous bait, and then sprinkle along the corn ridge.

2) Use 300-500ml of 80% dichlorvos emulsifiable concentrate per mu, mix 25kg of fine soil to make poisonous soil, and then choose to sprinkle the poisonous soil along the ridge on the side of corn seedlings in the morning.

3) Generally, it can be controlled by spraying with 48% chlorpyrifos EC 1500 times, 30% acemethamidophos EC 1000 times, and cyfluthrin EC 2500 times.

Second, the eggs of Spodoptera exigua are generally laid by the number of birds

1. Spawning location.

Spodoptera exigua, which lays its eggs at the base of corn seedlings, and the hatchling larvae will hide under the broken wheat straw around the corn seedlings during the day, or hide in the topsoil layer 2-5cm deep, and when night comes, they will come out to harm the corn seedlings.

2. Hazards. 1) The larvae will bite the base of the stem of the corn seedlings and form holes on it, which are circular or oval in shape, which will affect the delivery of nutrients, and then cause the corn in the aboveground to tilt, dump and die.

2) In addition, the larvae will also bite the corn roots, if the damage is relatively light, it will cause the plant to fall around, if the damage is more serious, it will lead to lack of seedlings and broken ridges.

The field clearing method is the most economical and effective control method at present, because the larvae of Spodoptera exigua, they have the habit of liking a dark and damp environment, so they should remove the wheat straw, wheat bran and other mulches in the corn field in time to destroy the suitable environment of Spodoptera exigua. After cleaning the wheat straw and wheat bran, spray the liquid medicine on the roots of the corn along the ridges. Secondly, in the adult stage, insecticidal lamps are used to trap and kill adult insects, reduce the egg drop rate, and reduce the damage.

Two points of Spodoptera exigua damage symptoms.

Spodoptera exigua belongs to the family Spodoptera exigua, with chewing mouthpartsMainly larvae damage maize seedlings from late June to early July, the light case will cause the corn to tilt or lodging, and the heavy case will cause the corn to die.

Spodoptera exigua, which likes to hide at the base of corn stalks covered with wheat straw, prefers darkness and dampness, and is afraid of bright light.

Generally, it survives in corn roots or moist soil, and there is a phenomenon of suspended animation, and it is a "C" shaped suspended death after encountering a sound or spraying of medicinal liquid.

Due to the similarity of its infested parts and morphology, many farmers are accustomed to mistaking Spodoptera exigua.

The relatively thick skin of Spodoptera exigua, which makes it difficult for the drug solution to penetrate, is the main difficulty in control, and the overlapping generations are the main reason for increasing the number of control.

The larvae of Spodoptera exigua, which mainly eat the underground rhizomes of corn, bring serious harm to corn at the 3 5 leaf stage.

Moreover, Spodoptera exiguae first eat from the base of the corn stalk, causing the corn seedlings to turn yellow in the aboveground and wilt and lodge irregularly.

SomeThe corn seedlings that were bitten off the rhizome were directly lodging and diedIf it is not controlled, it is easy to cause a large area of dead maize seedlings in the year of the big outbreak

Two points committee Spodoptera exigua:1.Kiyota smiles

It is the most economical and effective control method at present, because the larvae of Spodoptera exigua, they have the habit of liking a dark and damp environment, and they should remove the wheat straw, wheat bran and other mulches in the corn field in time to destroy the suitable environment of Spodoptera exigua.

After cleaning the wheat straw and wheat bran, spray the liquid medicine on the roots of the corn along the ridges.

2.Booby-trap method

According to the phototaxis characteristics of Spodoptera exigua, insecticidal lamps are used to trap and kill adults in the adult stage, so as to reduce the egg drop rate and reduce the damage.

3.Chemical control

Poison Earth Law

Use organophosphorus pesticide + avermectin to prepare poisonous soil and sprinkle it on the roots of seedlings, taking care not to sprinkle it on the leaves.

Watered with water

Corn fields are watered with chlorpyrifos or methylisomerofol with water.

Spray method

1) WithAvermectin + cypermethrin, emamectin benzoate, 20% chlorantranyl and other agents。The amount of liquid medicine should be large, and it is guaranteed to penetrate into the corn root circumference of about 30cm where the pests are hiding.

2) After the emergence of corn seedlings, it was found that there were corn seedlings that were harmed in the early stageIt can be lowered and sprayed along the ridge with a net emulsifiable concentrate 1000 times liquid + 1000 times liquid clothianidin suspension + pesticide additives

In this way, it can not only control Spodoptera exigua, but also have a very good control effect on gray planthoppers and some other pests. At the 3 5 leaf stage of maize, the control effect of spraying chlorantraniliprole suspension is also good.

3) AlsoYou can use 1000 times emamectin bollude solution, uniform spraying, has a good control effect on Spodoptera exigua, and the effective period can reach about three weeks.

Special effect of prevention and control of Spodoptera exigua! 35 days without insects.