Pepper tea yellow mite troubles many farmers, under what conditions is pepper tea yellow mite easy t

The optimal temperature for the development and reproduction of tea mites is 16 23 and the relative humidity is 80 90. Due to the higher temperature, more rain and higher humidity in June and July, it is especially conducive to the reproduction of tea yellow mites.

When the environment in which the chili tea is located is not ventilated, there is no sunlight, and it is relatively humid, it is very easy to produce yellow mites of chili tea.

It is very easy to occur when the temperature is relatively high and the humidity is relatively high, and the air permeability and water absorption of the soil are not good, it is also very easy to occur yellow mites, so you should buy some pesticides to hit the leaves of peppers, which can be prevented.

It is easy to cause such insect pests when the temperature is relatively high and the air is relatively humid, and this insect pest is suitable for survival in such an environment.

Green pepper tea yellow mite is prone to appear when it lacks nutrients, and it needs to be removed by applying pesticides to avoid affecting crop yields.

The optimal temperature for the growth and reproduction of green pepper tea yellow mite is 16 - 23 , and the optimal relative humidity is 80 - 90%, so the warm and humid environmental conditions are conducive to its growth and development.

1. Tea yellow mites suck plant juice around the young shoots, young leaves, flowers, fruits and other tender parts and growth points of vegetables with adult worms or, resulting in plant deformity and slow growth.

2. The back of the affected leaf is gray-brown or yellow-brown. It has an oily luster or oil-soaked shape, the leaves are stiff and straight, and the edge of the leaves is rolled downward;

3. There are often yellowish-white dots or rust-colored spots on the front of the leaves; The injured young stems and shoots often turn yellow-brown, twisted and deformed, and the top of the damaged stem and shoot is often dead;

4. The damaged buds and flowers generally fail to bloom and bear fruit, forming shriveled flowers and fruits. The fruit is damaged, the fruit stalk and peel are yellow-brown and the wood is corked, and the luster is lost, and the peel is cracked in the later stage, and the taste is astringent and uneatable.

The damage of tea yellow mite has obvious tenderness, often concentrated in the young buds, young leaves, young stems, flowers, buds and young fruits of colored bell peppers, etc., the affected leaves are thickened and stiff, the back of the leaves is gray-brown or yellow-brown, oily, twisted and deformed, and the leaf margin is curled downward; The young stems of the victim turned yellowish-brown, and the lateral branches were clustered and bald. The flowers, buds, and young fruits all turn yellow-brown, and the surface of the fruit is rough and yellow-brown, and the fruit is corked. The plant is dwarf, and when the damage is serious, it will cause flower and fruit dropping.

There will be a lot of damage, it will most likely lead to a decrease in yield, and it will also cause the leaves to turn yellow, and it will also cause these bell peppers to be harmed by these pests, and it will also affect the economic benefits.

The adult mites and young mites of the yellow mite of pepper tea are concentrated in the young leaves of pepper and suck for damage, the back of the affected leaves will be gray-brown or yellow-brown, with oily luster or oil-soaked shape, the leaves are curled outward, the leaves are narrowed, and the flowers and leaves are seriously dropped, the flowers and fruits are dropped, and the yield is greatly reduced.

The general symptom of this disease is that it will be deformed, and there will be many gray-brown spots on it, which will wilt, and there is no way to bear fruit, so it will also cause root rot.

First of all, there will be a lot of spots on the bell peppers, and there will also be gray-brown spots with a greasy sheen on them, and the plants will also be deformed, and the growth rate will be relatively slow, and the leaves will also roll up.

The specific symptom is that the leaves will be deformed, and they are yellow-brown or gray-brown, curl downward, drop flowers and fruits, and are especially easy to wilt.

Pepper sunburn is a physiological disease caused by direct sunlight. The pepper fruit is solid, the sunny side fades green and hardens, and the epidermis of the diseased part loses water and becomes thin and easy to break. The diseased part is prone to anthrax or limb saprophyte by some saprophytic bacteria, and grow black mold or rot.

Prevention and control methods, the use of shade net covering, avoid direct sunlight, timely and appropriate amount of irrigation to supplement soil moisture, to prevent the plant body temperature rise, fruit water loss and sunburn, reasonable dense planting; Shield the stems and leaves from each other to avoid direct sunlight on the fruits; After the diseased fruit is found, it should be removed in time, and the medium and trace elements should be supplemented in time after the fruit is formed, such as calcium, magnesium, boron, zinc, manganese, iron, molybdenum, etc., and foliar sprays can also be applied to Aiduo and brassinolide to improve the comprehensive resistance of plants and reduce the occurrence of sunburn.

Virus disease, the leaf margin is curled to the front of the leaf, forming an "upper buckle bucket", and the young leaves and old leaves are generally curled at the same time. The fruit is damaged with long spots of dark green and light green, with wart-like protrusions. Tea yellow mite, the damaged place has oily luster, gray-brown or yellow-brown, the leaf edge is curled to the back of the leaf, forming a "lower buckle bucket", the young stem is twisted and deformed, willow leaf-like, and the leaf surface has oil-soaked luster.

Capsicum virus disease and tea yellow mites, both of the harmful symptoms are leaf curling, the diseased leaves of viral disease are the leaf edge rolled upward, and the leaf edge is rolled downward after the tea yellow mite is harmful to the leaves.

Capsicum virus disease causes mosaic leaves, yellowing, necrosis, cap wilt and deformity of plants. It is different from the tea yellow mite in that after the leaf is damaged, it does not become thick and small, and its reverse side will not become oily, but the tea yellow mite will have these symptoms.

All are due to conditions caused by contact, but they are of different types. Because the cause is also different, the symptoms and methods are also different. But it's all okay.

The common symptoms of pepper virus disease include mosaic leaves, yellowing, necrosis, apical wilting and deformity; The adult mites and young mites of the pepper tea yellow mite are concentrated in the young leaves of the pepper to suck and suck, and the back of the damaged leaves will be gray-brown or yellow-brown, oily luster or oil-soaked, and the leaves will also curl outward and narrow, and in serious cases, there will be fallen leaves, flowers and fruits, so that there will be a significant reduction in yield. There are also symptoms of chili pepper tea yellow mite damage pepper and virus disease symptoms are similar, many vegetable farmers will not be able to distinguish clearly, resulting in improper medication, and eventually will delay the best period, which will cause a large area of yield reduction.

Therefore, it is necessary to pay attention to careful discrimination when diagnosing. So what are the differences between the symptoms of pepper virus disease and tea yellow mites?

1.In the early stage of the virus disease, the veins of the heart leaves fade green, and then gradually become the flower and leaves shrink, and the rescue thickens the diseased leaves, and the leaf edge will curl to the front to form an upper buckle bucket; The harm of tea yellow mite is that the whole leaf fades green, and the leaf edge is curled to the back to form a buckle bucket.

2.When the virus disease damages the fruit, dark green and light green spots will appear, and there will be wart-like protrusions; When the tea yellow mite harms the fruit, the surface of the fruit stalk and sepals is gray-white and then gray-brown, and it will lose its luster, and the wooden plug will also harden.

3. The main veins of the leaves harmed by the virus disease are brown or black necrosis, and then gradually expand to the side branches, main stems and growth points; The harm of tea yellow mites is any part of the back of the leaves, they may be gray-brown or yellowish-brown, and there will also be oil-soaked luster.

4.There are two main sources of pepper virus disease, namely cucumber mosaic virus and tobacco mosaic virus, cucumber mosaic virus mainly spends the winter on weeds and protective vegetable ground, and is transmitted by aphids in the second year; Tobacco mosaic virus, on the other hand, overwinters in soil, diseased residues, seeds and cigarettes, and is mainly transmitted through the field, through sap contact. The reproduction and transmission of aphids like to cause the epidemic of this disease in high temperature and drought weather, when there is a shortage of water, fertilizer, extensive management, small seedlings and late planting.

5.The living habits of the tea yellow mite: The tea yellow mite likes to develop at a temperature of 16-28, and it only takes 4-5 days to complete the first generation at a temperature of 28-30, and it takes 7-10 days at a temperature of 18-20.

Most of the adult mites and young mites gather on the back of the young leaves, young stems, flower buds and young fruits of peppers to suck the sap, which will eventually damage the plants.

The pepper virus is the yellow wilting of the leaves on the peppers that we often see. Necrotic deformity. And the yellow tea is full. That is, the leaves become thick and small after being damaged. The reverse side is oil-stained.

Tea mite belongs to the order of arachnid ticks, which mainly parasitizes vegetables and fruit trees such as eggplant, pepper and tomato. Young mites concentrate on the tender part of the plant to suck the sap, resulting in plant deformity, slow growth, stiffness, thickening, smallening of the upper leaves, the back of the leaf is gray-brown or yellow-brown after damage, the top of the plant is dry when severe, and the heavily damaged buds can not flower and bear fruit. Harmful symptoms:

When the round eggplant is damaged, the umbilicus turns yellowish-brown, showing cork and different degrees of cracks, and the cracks can be as deep as 1 cm, such as "flowering steamed buns", and the symptoms of the long eggplant are relatively mild after damage. After the damage of pepper, the back of the leaf becomes yellow-brown, with oily luster, the leaf margin is curled downward, and the young stem also turns yellow-brown. After tomato damage, the leaves became narrow, stiff and erect, with an oily luster. The peel is light brown. In addition, tea yellow mites can also be harmful to bitter gourd, loofah, cucumber and leguminous vegetables.

The optimal temperature for the growth and reproduction of tea mites is 16-23, and the optimal relative humidity is 80-90%, so the warm and humid environmental conditions are conducive to its growth and development. The pest is small, not easy to detect with the naked eye, and has a strong reproductive ability, so it is difficult to control. For tea yellow mites, chemical control is still the mainstay, and the key is to use drugs in time.

It must be used in the initial stage of tea yellow mites, the focus of spraying is on the upper part of the plant, especially the back of young leaves and young stems, and the agent can be selected with avermectin series varieties, which is used once every 7-10 days, and is used twice in a row.

Yellow mite is a common mite pest, in addition to peppers, eggplants, tomatoes, cucumbers, loofahs and other crops also have its figure. The relevant information and control agents of tea yellow mite are as follows:

1. Triggers.

The most suitable conditions for the outbreak period are around 20 degrees Celsius and the humidity is 80%-90%. It is especially serious in the spring and autumn greenhouses.

2. Harmful symptoms.

Tea mites like to eat young leaves (well, it seems that pests do), mainly harming the young fruits, sprouts, and young leaves of crops.

After the leaves are damaged, they will become smaller and curl upwards by the leaf edges, and the leaves will become thicker, and the leaves will generally be yellow and gray-brown.

3. Prevention and control agents.

a 45% bifenidoxiflex, 8 ml per bucket of water.

b 10% avidazalin, 8 ml per bucket of water.

c 10% avezolofenoxil, 3 ml per bucket of water.

d 22% averospirofen, 3 ml per bucket of water.

These agents must be used on a rotational basis.

(1) Agricultural prevention and control.

Clean the countryside. Eradicate weeds in the field in time, remove dead branches and fallen leaves in time after vegetable harvest, concentrate on burning, and strengthen the prevention and control of autumn and winter vegetables and tea yellow mites, which can reduce some insect sources. Cultivating clean seedlings.

The north should do a good job in the prevention and control of seedling greenhouses in autumn and winter, and avoid bringing mites from seedling greenhouses into production greenhouses or greenhouses and other protected areas. At the same time, attention should be paid to removing weeds and residues inside and outside the greenhouse, and paying close attention to the prevention and control in the greenhouse and other protected areas to reduce the source of mites moving into the open field.

2) Biological control.

At present, the natural enemies available for the control of tea yellow mite include Blunt Nissini, Blunt T. deli, Tonorium longiflora and P. parviflora.

3) Chemical control.

When the rate of leaf curling in the field reaches 2 3 heads (grains) per leaf, the average number of insects or eggs per leaf reaches 2 3 (grains) should be sprayed in time. The focus of the spraying is on the upper young part of the plant, especially the underside of the top few young leaves. Commonly used agents can be used 73% alkyne mite emulsifiable concentrate 1000 1200 times, 35% pyridoxine 1000 times, 20% pyridazine thionine 1000 times, 5% thiobenone emulsifiable concentrate 2000 times, etc., all of which have good control effects.

Tea yellow mites, also known as tea young leaf mites, tarsal mites. The eggs are scattered on the back of young leaves, the recesses of young fruits or young buds, hatched after 2 3 days, the young mite period is about 2 3 days, and the mite period is 2 3 days. The optimal temperature for development and reproduction is 16 23 and the relative humidity is 80% 90%.

The duration of generational development is 28 30 days, which is 4 5 days; In 18 to 20, for 7 to 10 days. Adult mites are lively, have strong tenderness, eggs and young mites have high requirements for humidity, and can only develop when the relative humidity is above 80%, so the warm and humid environment is conducive to the occurrence of tea yellow mites. Due to the continuous expansion of the cultivation area of the protected area, the tea yellow mite can occur all year round in the middle and lower reaches of the Yangtze River, and the reproductive ability of the tea yellow mite in winter is low.

In the greenhouse, the damage starts in late April, and the peak season is from late June to mid-September, and the winter is mainly overwintered in the greenhouse.

Tea yellow mite mainly harms eggplant, tomato, cowpea, kidney bean, green pepper, etc., and eggplant and pepper are the most serious. The juice is usually sucked by adult mites and mites concentrated in the tender part of the eggplant or pepper. The symptoms of tea mite damage on the back of the leaf are obvious, which is reflected in the curl of the affected leaf to the back of the leaf, and the mesophyll is oily pink, which has brownish-yellow or brown dots, and the leaf or young stem is twisted and deformed in severe cases; Tea mite mostly occurs in leaf tips, with the main damage site of 3 4 leaves below the growth point.

When the fruit is harmed, yellow-brown pinhole-like spots are formed on the surface of the fruit stalk, peel and sepals, and the fruit loses its luster, stiffness and cork, which seriously affects the edible value.

Control methods: The control of tea yellow mite is relatively simple, but due to the short life cycle and fast reproduction of tea yellow mite, special attention should be paid to early control. 2,4-D pesticide damage and thrips damage also have similar symptoms (leaf curling) to tea mite damage, but they can be distinguished from the damaged parts, the color of the affected leaves, and the main oil stain.

Pesticide control is controlled once every 7 10 days, and applied 3 times as appropriate, which can control the hazard. It can be used 2000 3000 times of insect mite light emulsifiable concentrate, or 20% mite net 2500 4000 times, or 40% tachycarnone 4000 4500 times, or 73% gite emulsifiable concentrate 2000 times, or 5% nisolan emulsifiable concentrate 2000 times, 1% insecticide 2000 times liquid, 20% metformamidine emulsifiable concentrate 1000 times liquid, 21% killing emulsifiable concentrate 2000 times liquid, Uranus emulsifiable concentrate 3000 times liquid spray. In addition, plant residues and weeds should be removed in time in winter to reduce the source of overwintering insects.