Are there any measures to control the big green leafhopper?

In mid-October, adults lay their overwintering eggs in the cortex of walnut, apple, pear, peach, apricot and other fruit tree branches. According to the living habits and occurrence rules of the insect, the following measures can be used to prevent and control it: whitening the trunk

Before the adults lay eggs in autumn (mid-October), apply a whitening agent on the branches to prevent the adults from laying eggs, and the whitening parts are mainly the main trunk and backbone branches of the young trees. The preparation method of whitening agent is: 40 parts of water, 5 parts of quicklime, salt, sulfur, and stir evenly after mixing.

Artificial egg killing combined with pruning: For young trees with a high density of egg masses and the infested shoots that must be retained, they can be crushed with wooden sticks before the eggs hatch. Combined with winter pruning, prune the branches with insect eggs and burn them intensively.

Reduce the habitat of the large green leafhopper: because the large green leafhopper is mostly transferred to cruciferous vegetables such as cabbage and radish in late autumn, so try not to plant cruciferous crops in the young orchard, if it has been intercropped, strengthen pest control, and harvest before the end of September to reduce the habitat of the large green leafhopper. Pharmaceutical prevention and control:

Catch the adults and spray before transferring to the orchard. From late September to early October, spray fruit trees, intercrops, trapping crops, and weeds every 10 days or so, and can use 1000 times of 50% phoxanthion EC, 1500-2000 times of 20% imidacloprid EC or 90% trichlorfon.

Measures to control the large green leafhopper: trapping adults: in the stage of adult insects, the use of black light to trap and kill, has a certain control effect.

or manually kill overwintering eggs to reduce the source of overwintering insects. Protect the trunk and whiten the trunk to prevent the female from laying eggs on it. For leafhopper pests, it should be mainly controlled by spraying during the peak period of nymphs or before the female adult lays eggs.

Commonly used agents are 40% dimethoate emulsion 1 000 times liquid, 50% leafhopper dispersed emulsion, 90% trichlorfon, 50% pine borer emulsifiable concentrate 1 000 1 500 times liquid, 25% carbaryl wettable powder 500 800 times liquid, 50% malathion 1 000 times liquid spray. Protection and utilization of natural enemies: natural enemies include birds, spiders, small pillow heterovel mites, Hua Ji hunting mistakes, red-eyed bees, leafhopper stalk wing egg wasps, plague mosquitoes, etc.

Natural enemies can be raised in captivity or the number of spraying can be reduced during the peak period of natural enemies to protect natural enemies.

The big green leafhopper is also known as the big green floating dust. The diet is more mixed, harming a variety of forest trees and fruit trees such as poplar, willow, elm, acacia, and almond; as well as crops, vegetables, weeds. In addition to directly sucking and harming young leaves and young stems, it is mainly the adult worm that stabs the cortex of the branch when laying eggs, causing wounds, causing branch death, and inducing branch diseases.

Young trees were more severely affected. Adults, females 9 10 mm long, males slightly smaller; body green, head orange-yellow, 2 black spots on the top of the head; anterior thorax dorsal plate pale yellowish-green, posterior half dark blue-green; The forewings are green with a blue-blue sheen, the tips are grayish-white, and the hindwings are smoky-black and translucent. Eggs, oblong, slightly curved, slightly thin at one end, yellowish-white, smooth surface.

nymphs, the last instar nymphs are 6 to 7 mm long, resembling adults, without wings, only wing buds; The body color of the newly hatched nymphs is slightly yellow, yellow-green after the third instar, wing buds appear, and 4 longitudinal stripes appear on both sides of the thorax and abdomen. The large green leafhopper occurs in 3 generations in 1 year. The eggs overwinter in the twigs and stem cortex of trees.

Overwintering eggs hatch in April of the following year. Nymphs move to vegetables, crops and weeds to feed on swarms and cause reproduction. The occurrence time of each generation was 4 July in the first generation, 6 August in the 2nd generation, and 7 November in the 3rd generation.

After the autumn harvest of field crops, they are transferred to autumn vegetables, and by mid-October, female adults begin to migrate to forest trees and fruit tree branches to lay eggs and overwinter. When laying eggs, the female adult pierces the epidermis of the tree with a saw-like oviposition device to form a crescent-shaped oviposition scar, and lays the eggs under the epidermis in the scar; Each egg mass is generally about 10 grains, neatly arranged in the curved raised oviposition scar; The branches are usually covered with scaly wounds and rough epidermis. Adults and nymphs like to inhabit damp nest winds, and occasionally frightened, they will walk obliquely or horizontally.

It has strong phototaxis and greenway, and often clusters harm. The summer egg period is 9 15 days, and the overwintering egg period lasts more than 5 months. Prevention and control methods.

Before the female adult goes to the tree to lay eggs in October, the trunk can be painted white, which can prevent the adult from laying eggs, or trap the adult by light; Before the overwintering females lay eggs, the insect mouth is concentrated, and 90 trichlorfon crystals or 80 dichlorvos milk can be sprayed.

It's called the little green leafhopper; Generally, there is no need to spray, and when it is serious, it can be sprayed with 20% fenvalerate EC 2000 times, or 40% dimethoate EC 1500 times.

1. Enemy kill, touch kill + kung fu touch. Quick results. It works well. Valid for 3 days. For every 15 kilograms of water, kill 1 yuan + kung fu yuan = yuan.

Imidacloprid internal absorption + kung fu. It will be effective the next day and will be valid for 3 days. 10% imidacloprid per 15 kg of water 1 yuan + kung fu yuan = yuan.

It can be killed with imidacloprid alone or dichloride before the month. Valid for 3 days. No more than 2 yuan per 15 kg of water.

Habits. The living habit occurs about 10 generations a year, and adults overwinter in the cracks of tree bark and weeds. In mid-March of the following year, the Viethorn began to be active in the winter generation, and in early April, it laid eggs in the main vein on the back of the leaves.

High temperature and rain are not conducive to the occurrence of this insect, and the peak period is from mid-June to mid-October. After hatching, nymphs like to swarm and suck on the back of the leaves, and small green spots appear on the surface of the damaged leaves.

The adult body is 3-4 mm long, yellow-green to green, with a white stripe on the top of the head, an inconspicuous black spot on each side, and white stripes on the inside of the compound eye and the green on the back of the head, which are connected with the previous white streaks"Mountain"Shape. The forewings are green and translucent, and the hindwings are colorless and transparent. The ventral surface of the female adult is grass-green, and the ventral surface of the male adult is yellow-green.

The eggs are about mm long, banana-shaped, slightly larger at the apex, pale yellowish-green, with red eyespots in later stages. Nymphs are similar in shape and color to adults except that their wings have not yet formed.

(1) Agricultural prevention and control.

Strengthen vineyard management and improve ventilation and light conditions. After autumn, remove dead leaves and weeds in the garden in time to eliminate the source of overwintering insects. During the growing season, weeds at the edge of the field should be removed in time to reduce the habitat of leafhoppers.

2) Chemical control.

Master the application of pesticides in the peak period of nymphs, and focus on the prevention and control of the first generation of nymphs. During the occurrence period, you can choose to spray 3000 times of cyhalothrin EC, or 2000 times of 10% cyhalothrin EC, or 20% imidacloprid wettable powder 2000 times, or 25% Alika water 3000 times.

Prevention and control methods: To protect and utilize natural enemies such as spiders, the number of pesticide applications in tea gardens should be minimized, the amount of pesticides should be reduced, and the control effect of natural enemies on their populations should be fully exerted. The phototaxis of the adults of the small green leafhopper was used to trap and kill the insecticidal lamp with frequency vibration. The implementation of timely and batch diligent harvesting can take away a large number of eggs and young nymphs with buds and leaves, reduce the density of insect population, deteriorate the food source, and control the population density. For pesticide control, the tea gardens with more than 6 buds before the first peak and more than 12 buds at the second peak should be comprehensively controlled. The appropriate period of control should be mastered in the early stage of the peak, and the amount of nymphs in the field is about 80%, and the application method is suitable for lateral spraying on the canopy surface.

Pesticides can be selected with Qingyuanbao (matrine) 600 800 times (100 150 ml per mu, 3000 4000 times of imidacloprid per mu (20 30 ml per mu, % acetamiprid 1000 2000 times (40 75 ml per mu, % parachlor 1000 2000 times (40 75 ml per mu).

The biological control of the large green leafhopper and the control of natural enemy insects are complementary and complementary, and the specific analysis is as follows: The large green leafhopper is an insect pest that harms forest trees, often causing the leaves of forest trees to dry up and die. In order to control the large green leafhopper, two methods of biological control and natural enemy insect control can be adopted.

Biological control is the use of other organisms, such as parasitic insects, natural enemy insects, fungi, etc., to control the number and harm of pests, so as to achieve the purpose of prevention and control. In the biological control of the large green leafhopper, parasitic plants, parasitic insects, etc. can be used to control the number of pests. For example, a parasitic insect called the "white-backed leafhopper" can be introduced and parasitic on the eggs of the large green leafhopper can be brought in to control the population.

Natural enemy insect control is the use of natural enemy insects, such as birds, dragonflies, ants, etc., to prey on and control the number of pests, so as to achieve the purpose of control. In the insect control of the natural enemy of the large green leafhopper, birds and dragonflies can be used to prey on the large green leafhopper, so as to control the number of pests. In summary, biological control and natural enemy insect control are both effective methods to control the large green leafhopper.

The two methods are not contradictory, but can be used in combination to achieve better prevention and control results.

Hello, the great green leafhopper is a common pest that lays eggs on trees, and the larvae suck the sap inside the tree, causing the tree to grow stunted or even die. In order to control the large green leafhopper, two methods can be used: biological control and natural enemy insect control. Biological control refers to the use of natural organisms or their metabolites to control the occurrence and reproduction of pests and reduce their harm to agricultural production and the ecological environment.

There are many natural enemies of the green leafhopper, such as parasitic wasps, spiders, ants, etc., which can prey on the adults, larvae and eggs of the large green leafhopper and play a certain role in prevention and control. Natural enemy insect control refers to the use of natural enemy insects to control the occurrence and reproduction of pests, this method has the advantages of environmental protection, economy, durability, etc., and will not harm the environment and human slag. However, the control of natural enemy insects also has certain limitations, such as the number and species of natural enemy insects are affected by environmental factors, and the control effect of natural enemy insects takes a certain amount of time to appear.

In summary, the biological control of the large green leafhopper and the control of natural enemy insects are complementary to each other, which can complement each other and improve the control effect. In the actual prevention and control process, various prevention and control measures should be comprehensively used according to the specific situation to achieve the best prevention and control effect.

The big green leafhopper, also known as the big green floating dust, uses adults and nymphs to suck and suck cherry branches and leaves, and the adults pierce the epidermis of the branches to lay eggs, causing the branches to dry up and die due to water loss and frost damage.

The adult is 7 10 mm long, yellow-green, with blue-green forewings and translucent. Three generations occur a year, and the eggs overwinter under the epidermis of the trunk and branches. The following year, the cherry germinates and spreads its leaves after the overwintering eggs hatch.

The first and second generations are mainly harmful to corn, peanuts, vegetables, weeds, etc., in mid-October, the third generation of adults began to migrate to the cherry saplings to lay eggs, and the oviposition site is a crescent-shaped wound, with 7 8 milky white long curved eggs.

The control method is to completely remove weeds in the orchard and reduce the damage and breeding places. Before migrating to the orchard in mid-October, the trunks are painted white to prevent egg laying. When the spawning site is found in the field, it is immediately manually squeezed to eliminate the overwintering eggs.

During the damage period, the tree was sprayed with 5% cypermethrin 2000 3000 times, or 10% imidacloprid wettable powder 3000 4000 times.

(1) For the damage and occurrence of the law, the big green leafhopper, also known as the big green floating dust. It belongs to the family Homoptera. In addition to strawberries, the insect also harms fruit trees such as apples, pears, peaches and apricots.

The adult has a yellow head with two black spots at the top. The anterior edge of the prothorax is yellowish-green, the rest is dark green. The tips of the forewings are transparent, the hindwings and ventral dorsum are black, and the feet are yellow.

Three generations occur in a year, overwintering with eggs under the epidermis of the trunk and branches. In April of the following year, the nymphs begin to infest as soon as they hatch. This insect occurs more heavily in ditches and overgrown strawberry fields.

2) Control methods For the fields with strawberries in the intercropping and the strawberry has serious green leafhopper insect infestation, before the adults lay eggs, a certain treatment method is adopted to prevent the insects from laying eggs and eliminate the overwintering eggs. During the adult period, a black light is set to trap and kill the adult. When a large number occurs, 20% deltamethrin EC 3000 4000 times can be sprayed, or 50% phoxanthion 1000 times liquid to kill the insect.

Stop using pesticides 3 weeks before harvesting strawberries.

The large green leafhopper sucks the sap of apple branches and leaves with adults and nymphs, affecting growth and weakening the tree's strength. In the north, especially in the north, overwintering eggs are laid under the bark of apple tree branches, which punctures the epidermis and causes the branches to lose water, which often causes winter and spring stubbing and the death of young trees, which is an important pest of seedlings and young trees.

Adults are 7 10 mm long, yellow-green, orange-yellow heads, black-brown compound eyes, two black spots on the top of the head, blue-green forewings, grayish-white translucent ends, black hindwings and ventral dorsal back, and yellowish-white to orange-yellow feet. The eggs are oblong, slightly curved, slightly pointed at one end, and the colostrum is nearly yellowish-white when hatched. Nymphs are similar to adults, the first hatch grayish-white with yellow-green, no significant stripes on the back of the thorax and abdomen, yellow-green after the third instar, wing buds appear, 4 brown to dark brown longitudinal stripes on the back of the thorax and abdomen, and the wing buds exceed the second abdominal segment at the fifth instar, and the body length is about 7 mm.

The first generation of adults occurs in late May, July and August is the occurrence period of the second generation of adults, and the third generation of adults appears in September and November, and each generation overlaps. In mid-October, it gradually shifts to apple trees to lay eggs, and in late October is the peak spawning season, and the eggs are overwintered.

Artificial control. Lights trap adults at night in summer; It is best not to plant autumn vegetables near apple saplings and nurseries, or plant autumn vegetables in appropriate places to trap and kill adult insects, so as to prevent the trees from laying eggs. For 1 2-year-old young trees, cover the trunk with a plastic wrap bag before the adult lays overwintering eggs, or whiten the trunk with a white coat to prevent the adult from laying eggs. Pesticide control is sprayed during the nymph occurrence period, and the type and concentration of the pesticide is 20% rapid killing of butyl, kung fu pyrethrin, deltamethrin and other pyrethroid 1500 2000 times liquid.