What are the habits of the Common Mealybug? How can I prevent Kang s mealybug?

Because of its host plant species, after many years of occurrence, has developed into a worldwide pest, in the Americas of the United States, Canada, Mexico and other countries in many vineyards will often occur Kang's mealybug insect pests Kang's mealybug feeding habits are very mixed, not only harm pear trees, but also harm apples, peaches, apricots, plums, cherries, grapes, hawthorns, persimmons, pomegranates, walnuts, plums, jujubes and other fruit trees and mulberry, poplar, willow, elm, melons and vegetables and other plants. Before the budding period of fruit trees, scrape off the warped bark and rough bark on the branches of fruit trees, and destroy the diseased and insect fruits and residual leaves under the fruit trees to destroy the wintering place of pests.

<> spray should be uniform and thoughtful, especially in the middle and lower parts of the canopy and the inner chamber. There are many wintering places for Kang's mealybug, overlapping generations, secreting wax powder, and preferring to drill fruit bags, which is difficult to control. In particular, once drilled into the fruit bag, the general pesticide control effect is poor, so it is based on doing a good job in the control of the first generation of nymphs (late May), focusing on the control of the second generation of nymphs (late July), and monitoring the third generation of nymphs (around late August).

Especially in the bagging orchard, the Kang's mealybug must be killed before entering the bag. If the individual fruit bags are not tightly bandaged and pests get in, as long as the pests in the fruit bags are found, the root irrigation can be carried out with dimethoate, which can kill the Kang's mealybug in the fruit bag. After bag removal, methyl tobuzine can be sprayed again.

Mealybugs occur in 2 to 3 generations a year, mainly overwintering with eggs in cracks in the bark of grapevines and crevices in soil and stones near the base of the trunk. When the grapes bud break the following spring, the overwintering eggs begin to hatch and the larvae crawl to the tender parts such as branches and leaves. Pay attention to the protection and use of natural predators:

The natural enemies of the mealybug include ladybugs and lacewings, and the use of natural enemies to control scale insects is a more thorough and trouble-free method. When using pesticides to control whiteflies, because there is a layer of protective wax on the outer skin of whiteflies, it is difficult for pesticides to come into contact with insects, and pesticide additives (such as washing powder, etc.) can be added. Appropriately added during prevention and control.

Generally, three generations occur in one year, and oocysts overwinter in the crevices of tree trunks and branches. The peak hatching period of each generation of nymphs is mid to late May, mid to late July and late August. The nymph development period is 35-50 days for females and 25-37 days for males.

The male nymph pupates in a long white cocoon. Each female adult can lay 200 400 eggs, and the oocysts are mostly distributed in the cracks of the bark. On flowers and trees, adults and nymphs mostly gather on young shoots and shoots to harm.

Pay attention to the protection and release of natural predators. There are ladybugs and lacewings. Starting in September, the grass is tied to the trunk to trap adult insects to lay eggs, and the grass is removed from the grass after winter and before germination to destroy the eggs.

Pharmaceutical prevention and control. In the period of dispersed transfer of nymphs, spray dichloride or kung fu emulsifiable concentrate or 20% emulsifiable concentrate, 20% rapid killing butadiene emulsifiable concentrate 3000-4000 times, 10% cypermethrin emulsifiable concentrate 1000-2000 times, 50% malathion or pine borer or Daofengsan emulsifiable concentrate 1000 times, if mixed with oil-containing diesel emulsion or clay diesel emulsion, it has a good killing effect on nymphs that have begun to secrete wax powder shells, and can prolong the control period and improve the control effect.

The mealybug spends its eggs under the warped bark of the vine, in the cracks of the bark, around the trunk, in the crevices of the soil or under other debris. In the prevention and control of the P. concorsonii pest, fruit farmers should seize the key prevention and control period according to the actual situation of the vineyard according to local conditions, so as to avoid the formation of mealybugs and the damage to grape vines.

Mealybugs generally have three generations a year, and they overwinter with oocysts in the cracks of tree trunks and branches. To prevent the mealybug, you can start with its natural enemies, such as ladybugs and lacewings. Medicants can also be used.

(1) Harmful characteristics.

Both adults and nymphs feed on the sap of the host's shoots, twigs, leaves, fruits, and roots with their stinging mouthparts. After the young shoots are damaged, they are often swollen, the bark is longitudinally cracked and dies, and the fruits are deformed in the early stage.

2) Regularity of occurrence.

It occurs in 2 to 3 generations in 1 year, and mainly overwinters with eggs in various crevices of the tree body and soil and rock crevices near the base of the trunk. When the pear sprouts, the overwintering eggs hatch and climb to the tender parts such as branches and leaves. The first generation of nymphs blooms in mid to late May, the second generation in late July, the third generation in late August, and the males begin to emerge in late September, mating and laying eggs for overwintering.

3) Prevention and control methods.

The transportation of seedlings and scion should strengthen quarantine to prevent the spread of the virus.

The initial occurrence of pear orchards is mostly spotted, and the insect branches are completely cut off or manually brushed with insect branches to eradicate the insect source.

Before the pear buds germinate, a stone sulfur mixture or oil emulsion kills the overwintering eggs.

In the peak stage of nymph hatching, the commonly used pesticides are 40% quick-culling EC and 25% thiazinone EC. In order to improve the insecticidal effect, synergists can be mixed into the solution.

1. Prevention and control of artificial model greeting.

Before winter, the trunk is tied to the grass to induce spawning and then burned intensively. Combined with other diseases and insects in the dormant period of Huhu, the old warped skin was scraped and brushed for winter eggs.

2. Chemical control.

At the peak of the hatching period of the 1st instar nymphs, 80% dichlorvos emulsifiable concentrate, or 50% malathiol pants pat phosphosphos emulsion 800 1000 times, or 20% deltamethrin, or deltamethrin, or cyhalothrin 2000 times 1 3 times.

1.Artificial control.

Before winter, the trunk is tied to the grass to induce spawning and then burned intensively. Combined with other diseases and insects in the dormant period, the old warped skin was scraped and brushed for winter eggs.

2.Chemical control.

At the peak hatching period of the 1st instar nymphs, 80% dichlorvos emulsifiable concentrate, or 50% malathion emulsion 800 1000 times solution, can also be sprayed with 20% deltamethrin, or deltamethrin, or cyhalothrin 2000 times 1 3 times.

Adult female adults are oblate-oval, 3 5 mm long, the thorax and dorsal part are raised and covered with a white waxy powder layer, there are 17 pairs of white wax filaments on both sides of the body, the anterior wax filaments are shorter, the posterior wax filaments are gradually longer, and the last pair of wax filaments is extra-long, slightly similar to the body length. The body is pale pink. The antennae are 8 segments, and the terminal segments are the longest.

The eye is hemispherical. 3 pairs of thoracic feet are well developed and sparsely bristled. The ventral umbilicus is large oval.

The male has a body length of 2 mm, a wingspan of 2 mm, purple-brown, one-eyed purplish-brown, transparent forewings, balanced rods on hindwings, and long tail hairs.

The oval is oval, about mm long, light orange-yellow, with white wax attached to the surface. It is produced in white cotton wool-like oocysts.

Nymphs, females, nymphs, 3rd instars. 1st instar body length mm. Pale yellow, oval, antennae 6-segmented, mouth needle extending almost to the anal ring.

The feet are thick and good at crawling. The second instar body is about 1 mm long. The body is covered with white wax powder, wax filaments appear on the body edge, and there are 17 pairs of piercing holes.

The 3rd instar body is millimeters long, resembles an adult, and has 7 antennae. Male nymphs are 2nd instarred.

Pupae males are millimeters long, pale purple in body, naked pupa. The cocoon is white cotton-wool, and the cocoon is oblong-oval, millimeters long.

In the dry area of Yanbian, Jilin Province, there are 2 generations a year. There are 3 generations in Hebei and Henan a year. The eggs are used to spend the winter in various crevices of the branches and in the soil and stone crevices near the root neck.

In the following spring, when the pear, persimmon and walnut germinate, the overwintering eggs hatch, and the first-instar nymphs crawl to the young leaves of the young branches and suck the insects. The peak occurrence of the first generation of nymphs is mid to late May; The second generation is in mid to late July, and the third generation nymphs hatch in late August. The female nymph stage is 35 to 50 days, and the skin is shed 3 times and feathered into a female adult.

The male nymph stage is 25 to 37 days, and the skin is shed twice to enter the pre-pupal quiescence stage in the cocoon, and then the male worm emerges after pupation. After looking for females to mate their tails, they die one after another. The female crawls into various crevices, fruit stalks, calyx depressions, etc., to secrete oocysts and lay oak eggs in the oocysts.

Clause. The first and second generations lay 200 450 eggs per female. The third generation lays 70 150 eggs per female, and the last generation of eggs is spent in the winter. Take 7-8 months as the worst. After hatching, the nymphs will be stationary for 1 or 2 days without oocysts, and on the third day, they will crawl to the branches, branches, leaves, etc.

It is distributed in Jilin, Liaoning, Hebei, Shanxi, Shandong, Henan, Sichuan, Shaanxi and other places. It is harmful to grapes, persimmons, walnuts, dates, chestnuts, apples, pears, figs, willows, lychees, etc. Adults and nymphs suck the sap from branches, buds, leaves, fruits, and roots.

Shoots and roots are often swollen, and the bark is cracked and dies.