How to control Spodoptera exigua?

Weeds must be eradicated so that the growth and reproduction of beet leaf moths can be controlled at the seedling stage, so that they lose their habitat. At the same time, turn over the land to clean up some diseased plants left in cabbage to prevent Spodoptera exigua from reproducing through these diseased plants. At the same time, place more insecticidal lamps in the field to kill some larvae, and clean up the eggs in time.

You can also use some professional agents, spraying once every five days, three times in a row.

Using the phototaxis of pests, a frequency-vibration insecticidal lamp or black light is set up every 40 to 50 mu in the field to trap and kill insects; It is also possible to use the tropism of Spodoptera exigua, diamondback moth and other sex pheromones, and place a set of sexual attractants in each acre of the field to trap and kill insects.

When planting, it is necessary to spray pesticides first, and then apply some fertilizer to the cabbage, so that the cabbage grows quickly.

You can get rid of the weeds in the field in time, and then spray it with insecticidal pesticides, which can be well controlled.

<>1. From the peak of larval hatching to the peak of the first instar larvae, use 1000-1500 times of 5% anti-Taibao, or 1000-1500 times of 10% de-suspension agent, or 2500 times of dichlorvos + 80% dichlorvos 1000-1500 times + 885 additives for control. 2. Use 25-50ml of 5% Spodoptera exxigua nirvana emulsifiable concentrate per mu, and 100ml of pyrethroid mate mixed with 50-75kg of water spray.

1. What kind of medicine is used to control Spodoptera exigua?

1. When the peak hatching period of Spodoptera exigua larvae to the peak of the first instar larvae, use 5% anti-Taibao 1000-1500 times solution, or 10% removal suspension 1000-1500 times solution, or 15% amdal suspension 1500 times solution, or BT300-500 times liquid + 2500 times dichlorvos 2500 times liquid, or BT300-500 times liquid + 80% dichlorvos 1500 times liquid, or 2500 times dichlorvos liquid + 80% dichlorvos 1000-1500 times liquid +885 additives (add 5g additives per 10kg of liquid medicine), or 20% kung fu pyrethrin 3000 times liquid + 80% dichlorvos 1000-1500 times liquid + 885 additives (add 5g additives per 10kg of liquid medicine), or 20% 3000 times of exclamation + 90% crystal trichlorfon 800 times + 885 additives, or 20% 3000 times of dichlorvos + 80% dichlorvos 1000-1500 times + 885 additives for prevention and control.

2. Use 25-50ml of 5% Spodoptera exiparena emulsifiable concentrate per mu, and 100ml of pyrethroid chaperone mixed with 50-75kg of water dilution spray.

3. In the peak stage of larval hatching, before 8 a.m. or after 6 p.m., use 1000-2000 times of 25% chlorpyramid emulsifiable concentrate, or 1000 times of 5% cyfluthrin emulsifiable concentrate + 500 times of 5% fipronidine dispersible liquid for prevention and control.

2. The difference between Spodoptera exigua

1. Spodoptera exigua larvae have variable body color, usually green or dark green, the lower line of the valve is yellowish-white, with yellowish-white longitudinal stripes (sometimes pink) on both sides, and there is a significant white markings on the base side of each valve, with a total of 4 pairs of gastropods.

2. Cabbage insect (cabbage butterfly larvae) has a total of 5 instars, when it has just hatched, the body color is gray-yellow, and then it becomes blue-green, the body shape is cylindrical, the middle section is relatively hypertrophied, there is an intermittent and inconspicuous yellow longitudinal line on the back, the valve line is yellow, there are two maculas on the line of each segment, the surface of the body is densely distributed with small black hair, and there are 4-5 transverse wrinkles on each body segment.

The difficulty of diamondback moth control has always been a problem in agricultural production.

Diamondback moth is an important pest in agricultural production, and its host can be as many as 40 species, mainly including kale, cabbage, cauliflower, cabbage, rape, cabbage and other cruciferous vegetables, and the harm to kale and cauliflower is particularly serious. In recent years, due to the poor resistance of crops, the damage caused by the moth has increased year by year, resulting in a serious decline in vegetable yield and quality.

The reason why diamondback moth is more difficult to prevent1. Small body, as long as there is a small amount of food, it can survive, and it is easy to avoid enemies.

2. The life cycle is short, and when the temperature is 28-30 degrees, it only takes 10 days to complete the generation.

3. Strong reproductive ability, with an average of 220 eggs per female, and scattered eggs.

4. The oviposition period of the overwintering generation of adults can reach 90 days, which causes serious overlapping generations and is difficult to control.

1. Pesticide control: use top hundred, 20 ml of a bucket of water Bixiao, spray from the peak of egg hatching to the young larval stage, and apply the pesticide in the evening.

2. Agricultural control: beet leaf moth reproduction is to lay eggs in patches, just hatched larvae into clumps, according to this characteristic, in the field pruning, pruning and other agricultural operations, timely discovery, the eggs, larvae are removed, taken out of the field or shed, and destroyed in a centralized manner.

3. Physical control: Insect nets can be set up at the vents of the shed to prevent pests from entering the shed, and the insect nets should be intact and free of holes, so as not to leave a chance for pests to enter the shed.

The diamondback moth is also called the diamondback moth, and the larvae are commonly known as the small green worms, and the adult body is 6 7 mm long, the wingspan is 12 15 mm, and it is light brown. The forewings have yellowish-white three-degree zigzag ripples, the two wings are closed when stationary, the antennae are stretched forward, the forewing edge hair is long, and warped like a cocktail, diamondback moth is only a disease and insect pest that occurs on cruciferous vegetables at the earliest. It was first seen on cabbage and purple cabbage in the Tianshui area.

The name of the Tianshui region occurred on cabbage, and later developed into cabbage, radish, cabbage, cauliflower, cauliflower, and lettuce.

Sex attractant control method: the use of synthetic insect sex hormones (sex attractants) to trap diamondback moth, 10-15 trap cores per mu, 10 days to replace once, high temperature and dry season, 7 days to replace once, diamondback moth adult trapping effect is good, the main breeding time in a year is mainly three times, the first time at the end of spring; The second is in the summer, the third is in the late summer to early autumn, and generally 6 to 20 generations can be born in a year. The egg stage reproduction is 2 to 12 days, and the larval reproduction period is about 11 to 28 days.

The diamondback moth, also known as the hanged ghost and the small green worm, is a gray-brown moth whose adult is a small gray-brown moth. It is the larvae that harm the vegetable, which are 6 8 mm long when they are old and mature, pale green, and slightly pointed at both ends. Diamondback moths are small, reproduce quickly, and lay large eggs, so they are often ignored by people and break out.

The first instar larvae of diamondback moth feed on plant mesophyll, leaving the epidermis, forming transparent spots on the leaves, and forming leaf cavities; The 3 to 4 instar larvae of diamondback moth can feed on the leaves into holes and nicks, and in severe cases, the whole leaves are eaten into a net.

Agricultural control law: when planting vegetables, avoid continuous cropping and mixed cropping of cruciferous vegetables, and the plots that have been planted with cruciferous vegetables can be rotated with tomatoes, lettuce, potatoes and other crops; After harvesting, clean up the insect leaves in the field in time to reduce the insect population base. When planting vegetables, avoid continuous cropping and mixed cropping of cruciferous vegetables, and the plots that have been planted with cruciferous vegetables can be rotated with tomatoes, lettuce, potatoes and other crops; After harvesting, clean up the insect leaves in the field in time to reduce the insect population base.

When choosing Chinese cabbage, it is necessary to spray pesticides on its roots and seedlings, spray some on the soil, and then spray some after it is done, and then spray pesticides according to the growth cycle of Chinese cabbage.

In such a situation, I think that pesticides should be sprayed in time, and insect pests should be removed regularly, and these pests should also be driven out in time, and water and fertilizer management should also be strengthened, and it is also necessary to ensure sufficient sunlight to ensure soil permeability.

When planting, we must choose the soil is more fertile and wide land, and in the process of fertilization, we must choose farmhouse fertilizer, do not use fertilizer bought outside, and often prevent the occurrence of pests and diseases, water the plants more, if there are small insects, then we must spray insecticides in time.

As long as there are cruciferous vegetables and wild vegetables in clean fields, there is the possibility of diamondback moth survival, therefore, winter open field cultivation, reserved plants and leafy vegetables cultivated in protected areas are the source of wintering insects, the insect quantity is more concentrated, and the pest resistance is also the weakest.

After the vegetable is harvested, or before the insect activity in early spring, the vegetable field can be completely removed from the residue and dead leaves, which can eliminate a large number of insect sources. "Tearing down the bridge" to prevent and control summer 6 July, cruciferous vegetables are less cultivated, and diamondback moths are concentrated in summer cabbage, summer cauliflower, summer radish, summer cabbage and other vegetables, so the "bridge" is gradually transferred to the cruciferous vegetables cultivated in a large area in autumn.

It is difficult to control diamondback moth, on the one hand, because of the lack of knowledge about its life history and larval occurrence characteristics. On the other hand, the diamondback moth has concealment, in the early stage of feeding on the leaves, the feeding point is needle-like size, it is difficult for growers to find, and when it is found that the obvious symptoms of eating mesophyll are harmful, the larvae are already in the third instar or more, and its drug resistance is strong, which is the key to causing difficult control.

Diamondback moths generally grow and develop around April-June and October, and the number of diamondback moths in April-June is higher than that in autumn. If it is rainy in summer, diamondback eggs, larvae and pupae will be seriously damaged due to high humidity, and if there is a drought in summer, it is not conducive to diamondback moth reproduction, but sometimes it will occur in large quantities.

The larvae of diamondback moth feed a small amount, and eat the lower epidermis and mesophyll, so that the cabbage leaves present a "skylight" shape, and the amount of food intake increases sharply after the 3rd instar, and the young leaves can be eaten into holes. Adults generally like to lay eggs on the leaf surface, the back of the leaf, and the main vein, mostly in the depression between the veins on the back of the leaf, some are scattered, and some are clustered together.

Spodoptera exigua is an important pest of the noctuidae family, which has a mixed diet and serious harm. Should.

The main biological characteristics of pests are diurnal and nocturnal, feigned death, and the epidermis has a waxy layer. Therefore, the pest has strong drug resistance and is difficult to control. The use of general insecticides to control Spodoptera exigua, the effect is often not ideal, seriously affecting crop yield and products.

quality, to agricultural production, especially vegetable production, to bring great losses, when a large occurrence can lead to the failure of the harvest.

Studies have shown that 10% chlorfenapyr, emamectin benzoate and 20% insects should be used for the control of Spodoptera exigua.

Insecticides such as hydrazide suspension, avermectin EC, 40% profenofos EC and 5% cypermethrin EC, among others.

The control effect of diluting 1000 times with 10% chlorfenapyr suspension and methylaminoavermectin benzoate emulsifiable concentrate with water was the best, and the control effect was more than 92% 3 days after application. This is followed by 20% fenozide suspension and avermectin EC, post-drug 3

The prevention effect is more than 71% every day. Conventional chemical pesticides 40% probromophos EC and 5% cis cypermethrin EC diluted 1000

The control effect is about 50%, and when the insect population density is large or the insect age is large, chlorfenapyr and emamectin benzoate and other agents should be used.

In order to avoid the resistance of Spodoptera exigua, remind farmers not to use these high-efficiency insecticides in a single row, and should use drugs alternately, especially the insecticides with different mechanisms of action.

Research and application of comprehensive prevention and control technologies such as physical prevention and control.

Hit the six fuding - nail the wire, you can.