Golden edge gidding insect is also known as pear golden edge gidding, emerald gidding insect, pear gidding insect, commonly known as string skin worm, plate head worm. It belongs to coleoptera, Family Gidingaceae. It harms cherry, pear, peach, apricot, plum, apple, hawthorn and other fruit trees.
First, the morphological characteristics of the golden edge gidding insect
1. Adult insects. The body spindle is slightly flattened. Female adults are 16 to 18 mm long and male adults are 12 to 16 mm long. It is emerald green in all and has a metallic luster of gold color. The head , thorax , back , and wings are several longitudinal stripes of blue-black spots , and when the wings are closed , there is a golden red longitudinal stripe on each side of the wing , hence the name. The antennae are serrated and black.
2 eggs. Oblate oval in shape, about 2 mm long. The primary milky white, near-hatched yellowish brown.
3. Larvae. The mature larvae are 30 to 40 mm long, flattened and milky yellow. The forebreast is enlarged , and there is a dark figure-of-eight groove in the center of the dorsal plate.
4. Pupae. Naked pupae, body length 15 ~ 20 mm. Initially milky white, then gradient green, then purple-red, metallic luster.
Second, the golden edge of the gidding insect as a pest symptoms
The larvae feed on the branches of fruit trees, mostly under the cortex on the main branches and trunks. The bark of the infested parts of the young tree becomes black, the damage of the cherry tree is not very obvious, the epidermis is slightly sunken, the knock has a hollow sound, and the tree gradually weakens or the branches die. The damaged branches often have flat, round feathered holes.
Third, the occurrence of golden edge gidding insects
Goldenrod giddings generally occur in 1 generation per year, and larvae of different ages overwinter in the worm tunnel. In the spring of the following year, when the fruit trees germinate, they begin to be pestized, pupating in March and April, and adult insects occur in May and June. Adults are active during the day, have phototropism and suspended death, and after feathering, they first feed on the leaves and eat the leaf margins into missing moments. After more than 10 days, adult insects begin to lay eggs, preferring to lay eggs on weak branches of weak trees, scattered in the cracks in the bark of branches and near various wounds, mostly on the sunny side. In early June, the eggs hatch, and the larvae hatch first moth the tender cortex, gradually deepening, and finally moth between the cortex and xylem. The worm passage is spiral-shaped, irregular, and the worm dung is piled up inside the road. Sap often oozes from the damaged branches, and the upper part of the worm passage dies after a week of circling the branches. Orchards with weak trees, poor soils, and scars are generally severe. After September, the larvae gradually enter the overwintering.
Fourth, the control method of golden edge gidding insect
1. Artificial prevention and control. Before the fruit tree germinates, combine pruning, shear the insect branches, and burn them intensively; or use a wire hook to kill the larvae in the moth. Every 2 to 3 days, adult insects are artificially shaken off the tree, using their suspended death, artificial hunting, or booby traps adults at night with black light.
2. Agricultural prevention and control. Strengthen cultivation management, rational fertilizer and water and load, enhance tree potential, avoid wounds, reduce the occurrence of pests; planing out senile trees. For senile trees that have lost the ability to bear fruit, they should be removed as soon as possible to reduce the density of insect populations in the field.
3. Chemical control. At the feathering stage of adult insects, spray 4.5% high-efficiency cypermethrin emulsion or cypermethrin emulsion 2000 times liquid on the branches. Wrapping a plastic film on the trunk to seal, the upper and lower ends of the mouth, and the aluminum phosphide tablets containing 1 to 3 pieces can kill the larvae in the skin. When necrosis or glue is found on the surface of the branch, the worm mouth is found to kill the larvae.