What s the Spodoptera exigua infestation? Will it cause a reduction in lettuce yield?

Yes, it may be because the plant was not sprayed with pesticides in time during the planting process, or it may be because the plant was not fertilized and watered regularly.

Because insects will prefer to eat some sweet dishes. So at night, those night moths will come to eat these beets, and after eating, they will cause great damage to the lettuce, and will make the lettuce unable to grow. will reduce production.

Because beets are sweet, they are especially easy to attract insects, yes, insects are not good for the growth of plants, so you need to get rid of them.

Lepidopteran pests should be Spodoptera exigua larvae, which are different from Spodoptera liliform larvae, which can be killed at one time with thuringiensis or single stabilized bacteria spray like a prevention method, which is effective for half a month and has no pollution. It can also be sprayed with drugs such as chlorantraniliprole, nail rhinitis, nail rhinitis, human insect stomach, etc. Spodoptera exigua has a mixed diet, which will harm soybeans, peppers, corn, soybeans, cabbage, taro and other vegetables as high-combustible materials.

It feeds mainly on the larvae, eating the mesophyll of vegetable leaves such as soybeans, and the super-hatched larvae are concentrated on the back of the leaves, dispersed when they are slightly larger, and after 3 years enter the gluttony, tearing open the leaves and shallow stems, forming holes or textured shapes, and in severe cases, nets will appear.

The young larvae of Spodoptera exigua can be eaten during the day, and the older larvae can also emerge during the day, lurking behind the leaves and in the middle and lower parts of the plant during the day, and coming out to eat around the night. The larvae are pseudonymous. Spodoptera exigua has a strong ability to withstand high temperatures, and if the base is not well controlled in the early stage, there will be more high temperatures, droughts and typhoons from July to August, which is more conducive to the occurrence and reproduction of Spodoptera exigua.

Therefore, vegetable farmers should prevent and control in time according to the actual situation of soybean and other vegetable fields to prevent the occurrence of insect pests. In the prevention and prevention of lepidopteran pests, it is necessary to accurately grasp the key to prevention. In general, it is best to inject the drug from the peak albumin to the young larvae.

The small resistance of the insects at this stage is small, and the resistance of larvae over 3 years old is significantly increased. Spodoptera exigua has a small number of insects, mainly young larvae, and can choose Spodoptera exigua polyhedrovirus particle agent, chlorantraniliprole, methylaminobacterium benzoate, etc. If the loyalty base is large or the elderly loyalty is large, you can choose Zhongwei, methoxy loyalty, mites, nail rhinitis, Renzhongwei, etc.

Spodoptera exigua is an intermittent pest that varies greatly in severity throughout the year, and population density varies greatly at different times of the year, with some areas experiencing violent disasters. Spodoptera exigua has some resistance to high temperatures, but it is unable to withstand low temperatures for a long time. Adults and larvae are weakly hardy and the larvae can die within 2 to a few days.

In the north, the temperature is low in winter, the mortality rate in the moon cave is high, and the occurrence in spring is small. In addition to temperature, Spodoptera exigua also prefers a dry climate with little rain, which is not conducive to pupal emergence. As a result, autumn often occurs due to the heat and drought of late summer.

Freshly hatched larvae gather behind the leaves or spit out cobwebs on the heart lobes, from which the mesophyll is extracted, leaving the epidermis. After three years, the leaves are eaten, and in severe cases, only the veins and petioles remain (Fig.). After the age of 3, you can dig the fruits of tomatoes and peppers, bean pods, green onion leaves, etc., and make the fruits fall and rot.

The body length is 10 14 mm, the wingspan is 25 to 33 mm. I appreciate brown. Forewings are horizontal, outer margins grayish-white, with black triangular spots on the outer margins, kidneys and rings yellowish-brown with black outlines.

The hind wings are silvery-white, slightly pink, and the wings are grayish-brown.

Cowpeas can also suffer from Spodoptera exigua. It will affect the normal growth of cowpeas, and it will also corrode the fruit of cowpeas. This will reduce the yield of cowpeas, and if people eat such cowpeas, it will also affect the body.

Spodoptera exigua has a more mixed diet, which will harm soybeans, peppers, corn, soybeans, cabbage, taro and other vegetable crops. Mainly feed on the larvae, eat the mesophyll of soybean and other vegetable leaves, super-hatched larvae are concentrated on the back of the leaves of the clan god book, disperse when they are slightly larger, enter the gluttony after 3 years, tear the leaves and shallow stems, form holes or texture shapes, and in severe cases, nets will appear.

<>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.

Spodoptera exigua has swarming, nocturnal and gluttonous nature, and the newly hatched larvae concentrate on the back of the leaf to feed and gnaw on the mesophyll, so that the leaf remains epidermis and is in the shape of a dense "small skylight". When the larvae are slightly larger, they can eat the leaves into holes or notches, and migrate and disperse; After 4 years of age, it hides in the topsoil near the heart leaves, the back of the leaves or the roots of the plant during the day, and comes out to feed at night; Older larvae can burrow into the leaf bulbs and excrete feces, reducing the value of the commodity.

Each category is divided into early-maturing, medium-maturing, and late-maturing varieties according to early and late maturing. The early-maturing varieties have a short growth period, fast stem growth, small stems, and early budding. The growth period of late-maturing varieties is long, and the stem growth rate of lettuce in northern greenhouses is mainly planted in spring and autumn, which has its own advantages and disadvantages, the growth time of spring lettuce is shorter, the temperature in the early stage is lower, and the plant is easy to vernalize and sprout, but the benefit of spring lettuce is better.

Autumn lettuce with the growth period, the temperature is more and more high, dry, well-drained plots as seedbeds, 3-5 days before sowing to apply 4000-5000 kg of rotting organic fertilizer or 500 kg of compound fertilizer per mu as base fertilizer.

Before applying the land, turn it deeply, level it finely, cover it with plastic film and wait for sowing. Lettuce, also known as lettuce, is a one-year or two-year-old plant. Prefers cool and humid climates, has a certain cold tolerance, does not tolerate high temperatures, and under high temperature conditions, stunted growth.

Avoid continuous cropping, and the effect is better in loam soil with good water and fertilizer retention. Lettuce, also known as lettuce, is a one- or two-year-old plant. Prefers cool and humid climates, has a certain cold tolerance, does not tolerate high temperatures, and under high temperature conditions, stunted growth.

Avoid continuous cropping, and the effect is better in loam soil with good water and fertilizer retention.

<> this season's lettuce is harvested in March and May. When the warm and long sunshine comes after spring, it is easy to sprout and can not grow into a hypertrophic and tender stem, which seriously affects the yield and quality, so spring lettuce should be selected late maturing varieties that are not easy to sprout, such as hanging silk red, double-pointed green hemp leaves, green hemp leaves, lettuce is easy to sprout after vernalization, and lettuce varieties that are ready to overwinter should be planted with strong cold resistance, wide adaptability and late sprouting. The seedling bed is selected in the field where the soil is fertile, the terrain is high and dry, and there is no water accumulation after rain, and the seedling soil can be mixed in.

Spring lettuce is generally planted in mid to late March, and it is best to use soil manure, and it is not possible to apply it with compound fertilizer. Generally, the row spacing is 40 cm, and the plant spacing is 30 cm. Watering after planting, seal the soil, and water once in about half a month if the weather is dry.

This allows for rapid growth. Lettuce, also known as lettuce, is a one- or two-year-old plant. Prefers cool and humid climates, has a certain cold tolerance, does not tolerate high temperatures, and under high temperature conditions, stunted growth.

Avoid continuous cropping, and the effect is better in loam soil with good water and fertilizer retention.

In winter, the little moth is unusually active, which can damage the growth of lettuce and increase the temperature in the greenhouse so that the bug does not develop.

The harm is that these insects can destroy the growth of lettuce, and they can also bite the rhizomes of lettuce and cause insect infestation to lettuce. If these bugs appear in the lettuce, then the lettuce should be sprayed with some pesticides.

It is very harmful to lettuce, and it is likely to cause lettuce to be frostbitten, and it is likely to cause lettuce to be damaged or destroyed. In such a situation, pesticides should be sprayed in time, and regular repairs are also required, and water and fertilization should also be done in time to manage water and fertilizer.

It may hurt the growth of lettuce, and it will also hurt the yield of lettuce, there will be some black spots, and some pesticides should be sprayed to prevent pests and diseases, so that it can be well managed.

It will gnaw on the rhizome and leaves of lettuce, and at the same time, it will also make the leaves of lettuce holes, and it will also affect the yield of lettuce, and will also affect the color of lettuce, which may cause the roots of lettuce to rot. Choose the appropriate agent for spraying, and pay attention to prevention in advance, but also pay attention to fertilization.

Reduce the value of the commodity, feed on the back of the leaf, gnaw on the mesophyll, so that the leaf remains epidermis, in the form of a dense "small skylight". When encountering this kind of pests and diseases, it is necessary to spray pesticides in time, so as to have a chance to save it.

Spodoptera litura, also known as nocturnal thief, Spodoptera exigua, aconitum, and blackhead. It mainly harms young shoots and young fruits, gnaws on new citrus leaves, bites the leaves incomplete, pitted, and even eats up the leaves, seriously affecting the growth of fruit trees, and also provides an invasive wound for the spread of canker.

Habits of Spodoptera litura.

How can Spodoptera litura be prevented?

What are the dangers of Spodoptera litura?

Steamed buns are the traditional fermented pasta in our country, and the people basically have to eat them every day, so the steamed bun shop industry has endured for a long time, and the more it develops, the larger the scale, and the higher the degree of mechanization, and the steamed buns of the steamed bun shop are really big and soft, everyone is very curious, how they make noodles because the steamed bun shop is becoming more and more popular, so many people will speculate that the steamed steamed bun will not add something like leavening agent to make the steamed bun increase and become virtual, but in fact, it is not. A friend of mine has been making steamed buns for more than ten years, and he said that there is no need for additives at all, because steamed steamed buns are still too simple for Chinese, as long as there is a suitable, secret recipe.

Spodoptera litura's hatchling swarms are infested, and they gradually disperse after the second instar to feed on mesophyll, and enter the gluttony stage after the fourth instar, with 5 and 6 instar larvae accounting for 90% of the total food consumption. The larvae bite the leaves, flowers, buds and fruits, and the leaves are pore or missing, and in severe cases, the whole field of vegetables can be eaten into stalks. The best control period is from the egg hatching period to the first peak of the 2nd instar larvae.

The agent can be treated with 1500 times of 10% depletion (mitenile) suspension, or 1500 times of emulsifiable concentrate (emamectin), or 4000 times of 15% anda suspension, or 800 times of 5% methamine (lice urea) emulsifiable concentrate, or 1200 times of Caixi (polytoxin) suspension, or 800 1000 times of 48% chlorpyrifos emulsifiable concentrate, or 2000 times of Uranus (bifenthrin) emulsifiable concentrate, or 2000 times of 5% anti-Taibao (fluridin) emulsifiable concentrate. The control effect can reach more than 90%. In order to delay the resistance of the insect, attention should be paid to the alternating use of different pesticides, less pyrethroid pesticides, the use of low-volume spray, in addition to the uniform application of the plant, the ground near the rhizosphere of the plant should be sprayed at the same time, in order to prevent the loss of treatment of larvae rolling to the ground.