Morphological characteristics and harmfulness of jujube bark moth

Jujube bark moth belongs to Lepidoptera, Lepidoptera. Also known as truncated bugs. The adult is 18-22 mm long, with white head, gray-white chest and abdomen, filiform antennae, 6 blue spots on the chest and back, 2 rows in the vertical row, irregular blue spots on the forewings, narrow stripes of black and blue in front of the submiddle folds of the hind wings, and dark flanges on the edge of the wings. There are three black longitudinal spots on the back of each segment of the abdomen, and there is a round spot on each side.

Ovoid, light yellow in the first birth, densely reticulated.

The larva is 30-40 mm long, the head is yellowish brown, the carcass is purplish red, the forechest dorsal plate is black, with 2 black spots, and the posterior edge has 4 rows of black spines. The buttocks are black and shiny.

The pupa is a quilt pupa, curved spindle-shaped, faded.

The pest is mainly distributed in South China and North China, and harms apricot, pear, walnut, Robinia pseudoacacia and so on. The larvae are eaten into the hanging part of the jujube and move in the xylem, causing the jujube to hang and wither, especially after harming the young trees. the formation of small and old trees can not bear fruit, which has a great impact on the yield of jujube trees.

Life habits and control methods of jujube leopard moth

The insect occurs one generation a year, and the larvae overwinter in the damaged branches. After the sap flows in the next year, the larvae begin to eat xylem in the medulla, gnawing out the hole, exhaust and defecate every certain length. The mature larvae entered the pupation peak at the beginning of July. Before pupation, the worm feces were used to block both ends of the insect path, and silk was entangled and pupated in it. Adults have phototaxis, remain still during the day, fly and mate at night, and lay eggs on young trees and new jujube branches.

After hatching, the larvae begin to eat the xylem from the petiole base and feed on the xylem of jujube. With the age and body increase, the larvae begin to transfer to the secondary branches, primary branches or the trunk of young trees. First of all, nibble on the cortex, feed on the xylem, go straight to the pith, and feed from the bottom up. Before overwintering, they often turn back and eat downward, and block the insect mouth in the thicker branches to survive the winter.

Prevention and control methods:

The main results are as follows: (1) A general survey of withered branches was conducted in early May, and those with withered branches or sprouting jujube heads were found to be pruned from 20 to 30 cm below the withered branches. After the wormholes were found, they were cut open to destroy the larvae.

(2) during the peak period of adult Eclosion, light or fire was carried out according to the phototaxis of adults.

(3) look for wormholes and inject 50% methyl 1605100 times the solution along the wormhole to kill the larvae in the branches.