Cherry pest
<h1 class = "pgc-h-arrow-right" > (i) mulberry white borer</h1>
Mulberry white borer, also known as mulberry shield borer and peach shell worm, is an important pest of peach, cherry and plum trees.
1． Identify features
The female shell is slender, white, about 1 mm long, with 3 longitudinal ridges on the back. The hatching nymphs are pale yellowish brown, oblate oval in shape, and have a body length of about 0.3 mm. Female adults and nymphs cluster on the branches suck sap as a pest, and the 2-3 year old branches are heavily damaged, and when severe, the trunk densely overlaps a layer of gray-white shells, which causes the surface of the branches to be depressed after the damage, the tree is weak, and even the whole plant dies.
2． Occurrence characteristics
In the north, three generations a year occur, with female adults overwintering on infested branches. In March of the following year, the nutritional supplement continued to be harmful, and eggs were laid soon, and the incubation periods of each generation of nymphs were early to mid-May, early July and early September.
3． Prevention and control methods
(1) Artificial prevention and control. A hard bristle brush or wire brush brushes off the overwintering insect body on the branches, combined with pruning, pruning, pruning the affected branches, and cutting the affected branches for burning treatment to reduce the harm and control the density of the mouth of the overwintering insects.
(2) Spray control. The spraying period is the peak of egg hatching of each generation and before the dispersion and transfer of nymphs and the formation of wax powder to form a mesohus. The agent is 40% chlorpyrifos, or 48% Lesben emulsion 1000 to 2500 times liquid, or 52.25% toxic chlorine emulsion (agrole) 1000 to 2000 times liquid, or 10% imidacloprid wettable powder 1500 times liquid. Spray evenly, under the tree, around the branches, leaving no dead ends. In order to improve the efficacy, neutral laundry detergent can be added to the drug to increase the spread and permeability of the agent.
(3) Biological control. Do not choose broad-spectrum drugs when spraying, protect and utilize natural enemies, the main natural enemies are red-spotted lip ladybug, black-edged red ladybird, heterochromatic ladybird, deep-spot mite ladybird, Japanese square head beetle, soft aphid wasp and lisa grasshopper.
<h1 class = "pgc-h-arrow-right" > (ii) Golden-edged giddings</h1>
Golden-edged giddings, also known as string-skin worms, are mainly harmful to fruit trees such as pears, peaches, cherries, apples and apricots.
Adults are 13 to 16 mm long, emerald green, metallic, with 5 blue-black stripes on the dorsal plate of the anterior thorax, and more than 10 stripes of small black spots on the wing sheath, with golden red bands on the sides. The larvae are milky white to yellowish white, flattened and footless, with a small head, flattened and hypertrophic first segment of the anterior thorax, and pronounced posterior segments. After the larvae cover the bark of the trunk of the human moth, they eat in a vertical and horizontal string. After the young tree is harmed, the bark of the injured part outside the insect path becomes black and sunken, and the symptoms of the injured area outside the large tree insect path are not obvious.
Occurs annually with old mature larvae overwintering within the infested cortex. In the early spring of the following year, the larvae continue to become harmful within the cortex. The pupal stage of larvae is from May to June, and the feathering period of adult insects is from June to early August. Adults lay their eggs mainly in the trunks of trees on the sunny side or in the cracks in the coarse skin of large branches. The egg stage is 10 to 15 days. After hatching, the larvae bite the bark of the tree, moth into the damage, and as the insect grows older, the moth is strung between the xylem and the bark. The moth is stuffed with coarse insect droppings.
(1) Control of adult insects during the feathering period. During the feathering stage of adult insects, spray 300 to 400 times the liquid of green Vere, or 2% of the microcapsules of thiamethialine 200 times of the liquid, or 90% of the crystalline dimethopods 200 times the liquid. Or use a black light to trap the adults.
(2) Prevention and control at the egg stage and the initial incubation stage of larvae. This period scrapes off old bark, destroying eggs and newly hatched larvae in the bark crevices.
(3) Prevention and control of hazard period. The surface of the worm hole or branch is found to be black and necrotic, and the worm is injected with 80% dichlorvos emulsion 500 times liquid to kill the larvae.
<h1 class = "pgc-h-arrow-right" > (3) large green leafhopper</h1>
The large green leaf cicada is also known as the floating dust, the green leaf cicada. It is distributed throughout the country and harms fruit trees, crops, vegetables and so on.
Adults are 7 to 10 mm long and bluish green. The head is orange-yellow with 1 small black spot on each side. Nymphs are similar to adults, turning from gray-white to yellow-green after hatching, and 6 to 8 mm long when mature. Adults and nymphs are used as pests of leaves, and the sap of the leaves is sucked by the mouthparts, causing greening, deformation and curling, and in severe cases, the whole leaves die.
The north grows 3 generations a year, overwintering with eggs under the epidermis of the branches. Nymphs begin to appear in egg hatching in April of the following year, with the first generation of nymphs occurring from early April to early July, the second generation of nymphs from early June to mid-August, and the third generation from mid-July to mid-November. Generations are not neat and overlap generations. Adults are phototropic, and the adult ovipositor punctures the epidermis and lays eggs in the cortex tissues such as petioles and branches of the host plant. In the early stage, it mainly affected crops, vegetables, weeds and other plants in low-damage areas, and by September and October, the third generation was gradually transferred to fruit trees and trees.
(1) Prevention. Remove weeds from and around the orchard and spray with 1% matrine and 2% leafhopper powder to remove the main leafhopper.
(2) Spray control. Tree hazard period 2.5% kung fu emulsion 2000 ~ 3000 times liquid, or 10% imidacloprid wettable powder 2000 times liquid.
(3) Light booby trap. Taking advantage of the phototropism of adult insects, insecticidal lamps are hung in the park to trap adult insects.
< h1 class = "pgc-h-arrow-right" > (iv) Apple perfoliary moth</h1>
The apple winged moth mainly harms apple, peach, cherry and other fruit trees. It is mainly distributed in the north of China.
Adults are 10 to 18 mm long, bluish-black, blue-shiny, and shaped like bees. The forewings are narrow and transparent , with 4 to 5 yellow transverse bands on the abdomen. The larvae are 20 to 25 mm long, the head is yellowish brown, the thorax and abdomen are milky white, and the midline is reddish. The larvae usually fall under the human cortex at the trunk branches, etc., and endanger the phloem, sometimes to the xylem, and the moth path is irregular. There are red smoke oil-like fecal debris left in the injured part of the branch, and the wound is easily infected with rotten bacteria, causing ulceration.
Occurs in one generation a year, overwintering with larger larvae in cocoons in the incognitozoal tracts. In early April of the following year, the overwintering larvae continue to feed on the pest, and in early to mid-May the larvae mature in the damaged area, biting an impenetrable round feathering hole in the epidermis, and spitting silk wrapped in worm droppings and wood chips in which pupate. The feathering season is from late May to mid-June. Adult eggs are mostly laid in the thick bark cracks and trunk branches of the trunk or main branch, etc., and the larvae bite through the skin of the borer after hatching. In November the larvae overwinter in cocoons.
(1) Cultivation management. Strengthen the soil and fertilizer water management of trees, enhance tree potential, and reduce the incidence and degree of harm. When scraping the bark of trees in autumn and winter and finding symptoms of harm from the reddish-brown insect dung penetrating wing moth, use a knife to dig out the larvae inside it to kill.
(2) Spray control. During the feathering period of adult insects (June to July), spray palliferin, kill permethrin and other pyrethroids, and spray again after 15 days to eliminate adults and hatching larvae.