How to control two point leaf mites? How to control leaf mites

There are two main types of mites that harm eggplant: leaf mites and tea yellow mites. They are born by young mites, mites and adult mites attached to the dorsal veins of eggplant leaves and sucking the sap. The symptoms of the two types of eggplant mite pests are slightly different.

Two-point leaf mites are harmful, first make many gray-white dots appear on the eggplant leaves, and gradually make the whole leaf surface turn gray-white and yellow, so that it withers and falls off, and in severe cases, the whole plant dies with a bare rod. Tea yellow mite is harmful, there is juice oozing on the back of the leaf, and it is oily brown after drying, shiny, and the leaf edge is recurled and wrinkled to deformity, and it will also cause a large number of fallen leaves in serious cases. Mites are pests of flowers, which can cause a large number of flowers and fruits.

The young fruits infested by mites have stiff tissues and a tortoise-like epidermis, which causes fruit cracking in severe cases.

Prevention and control measures:

The reproduction rate of mites is extremely fast, and the key to prevention and control should start from cleaning the countryside and preventing the source of primary infection. At the same time, it is necessary to strengthen cultivation management, loosen the soil in time, reasonable irrigation and fertilization, promote the robustness of plants, and enhance the ability to resist insect pests.

At the beginning of the mite infestation, use 1% pyrex 2500 3000 times, or 73% gram mite emulsifiable concentrate 2000 3000 times, or 5% Nisolan emulsifiable concentrate 1500 2500 times, or alkyne mite 2000 3000 times, or 20% mite emulsifiable concentrate 1000 2000 times, or 10% Liuyangmycin emulsifiable concentrate 2000 3000 times, respectively, mixed with 3000 6000 times silicone spray control, every 7 days or so, spray 2 times continuously.

Leaf mites are commonly known as spider mites. By crawling or with the help of wind and rain and man-made carry and spreading, from point to surface, from less to more, gradually to the whole field. Leaf mites like to suck the juice on the back of the leaves, and the leaf surface initially shows green spots, and then the whole leaves lose their green and dry up and fall off, and the plant decays prematurely.

Key points of prevention and control: soil tillage and irrigation, water-drought rotation; Remove weeds from the edge of the field. The best time for chemical control is to pick and treat when spotting occurs, and choose special acaricides such as bromodilate (insecticides cannot be used, so as not to kill natural enemies and insects, so that the mite damage is getting more and more serious).

The commonly used dicofol contains DDT, which has a long residual toxicity period and cannot be reused. There are also caricidine, pyridafenone, phenbutyltin, tetramitezine, cerafenone, pyridafen, etc.

The two-spotted leaf mite mainly sucks the sap on the back of the leaves, and mostly gathers on both sides of the main vein to feed. At the initial stage of the damage, there are a number of pin-eye-like white dots on the front of the leaf, and later the small dots increase, so that the whole leaf is white. When the insect population density is large, a layer of white wire mesh is formed on the back of the leaf, which causes the leaf to scorch and fall off in severe cases.

The female adult mite is millimeters long and millimeters wide, and the dorsal view is oval. It is often brick-red or yellow-green during the summer and autumn active periods, and mostly turns orange-red in late autumn, and the body color changes to orange-yellow during diapause and wintering. The body of male adult mites is millimeters long and wide, and the back view is slightly diamond-shaped, much smaller than that of female mites, light yellow or light yellow-green, and their activities are more agile.

Ovophyte, shiny, milky white translucent, darkens with embryonic development, and 2 red eyespots appear before hatching. Juvenile mites hemispherical, pale yellow or yellowish-green, with 3 pairs of feet. If the moth body is oval, the feet are 4 pairs, and the resting period is green or dark green.

7 9 generations occur in 1 year in the northern fruit area, and the fertilized female adult mites overwinter in branch cracks, under the old warped skin, in the root neck of fruit trees, and under weeds or overweeds. In spring, when the fruit trees germinate (the temperature is above 10), the overwintering female adult mites begin to sting. Female adult mites overwintering on the ground under the tree first feed on the weeds before going up to the tree.

Adult female mites overwintering on trees are first harmed in the inner chamber of the canopy and then spread to the whole tree. The occurrence of two-spotted leaf mites is the most serious in July and August, and orange-yellow overwintering female adult mites appear one after another after September, looking for overwintering places for wintering. The development period of the two-spotted leaf mite is short, under 20 25, and it only takes 8 10 days to complete the first generation.

Each female lays more than 100 eggs. The mite is very resistant to pesticides, and it is difficult to control it with general acaricides.

Artificial control. In early spring, the mature trees were combined to control other diseases and insects, scrape off the rough bark on the main trunk and main branches, and concentrate on the treatment to eliminate the overwintering female adult mites; Before wintering (late August), the trunk is tied to the grass to attract overwintering female adult mites, and they are unraveled and burned before germination. Dozens of natural enemies such as ladybugs, flower bugs, thrips, cryptoptera and predator mites are mainly protected and used to prey on leaf mites, which play an important role in controlling the population growth and decline of leaf mites.

Therefore, orchard medicine should try to choose pesticide varieties that have less impact on natural enemies. The commonly used drugs for the prevention and control of pesticides include avermectin EC 4000 5000 times, 5% Carrot EC 1000 times, 20% mite net suspension 2000 3000 times, 5% Nisolan EC or 25% Beleba WP and 73% Kemite EC 2000 times.

Chemical control can be used to deal with insect infestations, but this will make more and more leaf mites resistant to insecticides, making it more difficult to control insect pests in the future. In fact, leaf mite larvae are very well controlled in leaves, so the use of insecticides should be minimized.

For example, abatein, sinokill and so on are very effective against larvae, because these agents can enter the leaves to kill the larvae. Pyrethroid insecticides such as permethrin and cypermethrin are effective against adults but not much against larvae.

The frequency of insecticide use is affected by the current number of leaf mites and their growth cycle. In order to disturb the habits of leaf mites, you can spray insecticides in the morning when the female eggs are laid, although the scheming is very effective against leaf mites, but it should be avoided as much as possible.

Preventing mite damage has become an important health issue for modern people. People should improve their awareness of mite prevention and mite removal, and pay attention to maintaining the cleanliness of their home and office environment; The air conditioner should not be turned on for too long, generally 1 3 hours after turning off, and then open the window to replace fresh air; Keep the room clean to reduce the source of disease pollution. White-collar workers who often sit in the office should stand up intermittently to carry out activities to promote blood circulation and enhance resistance; When cleaning the room, try to prevent dust from rising, and keep the room fully ventilated and lit; Wash and dry your clothes frequently; At the same time, try to use skin care and cleaning products with anti-mite function, and don't care about "mites" anymore.

Are you still worried about mites, teach you how to get rid of mites in a minute!

Spraying special acaricides such as: avermectin, sweeping mite, pyridoxin, insect mite buster, etc.

(1) From the end of August, the grass is bundled on the trunk of the tree to lure the mites to overwinter, and after winter, they are untied and burned. In early spring, the tree is removed from the bark to eliminate the female adult mites that overwinter here.

2) Eradicate weeds in and around the garden, eliminate early spring hosts, and cut off germinating tillers and canopy bore branches, which can reduce the number of pests and mites.

3) Intercropping crops such as beans and cotton and using black locust as orchard hedges will increase the number of hosts and wintering sites, and then destroy them.

4) Timely irrigation and increase of relative humidity can cause an unfavorable ecological environment for the two-spotted leaf mite. Controlling the application rate of nitrogen fertilizer and increasing phosphorus fertilizer and potassium fertilizer appropriately can achieve the purpose of enhancing tree vigor and worsening the occurrence conditions of two-spotted leaf mites.

5) Spray 3 5 Baumé stone sulfur mixture before grape budding.

6) For anti-mite during the growth period, you can choose to spray 73% gite emulsifiable concentrate 2000 times, avermectin emulsifiable concentrate 5000 times, 5% thiobenone emulsifiable concentrate 2000 times, 50% tetramitezine emulsifiable concentrate, etc. When the average active mite reaches 4 5 leaves, it can be sprayed for control.

7) Protection and utilization of natural enemies: In addition to the rational use of pesticides, lacewings and predator mites can be released in orchards if conditions permit.