Scientific name Hyphantria cunea (Drury) Lepidoptera, Lampus. Alias ​​autumn caterpillar. Distributed in Liaoning, Shaanxi, Shandong and other provinces.
There are more than 300 species of plants such as mulberry, straw, persimmon, apple, peach, plum, jellyfish, hawthorn, pear, apricot, cherry, and grape.
The characteristics of the larvae damage leaves and twigs, the young skin mesophyll residual epidermis was albuginea-like, long time dry, slightly larger leaves were missing nicks and holes, severe food into a light stalk.
Morphological characteristics Adult body length 9-12mm, wing 23-34mm, white, compound eye dark brown; male antennae black, double dentate; forebrain white to scattered many light brown spots, overwinter adult spot; female antennae brown Jagged, white winged, spotless. The hind wings are usually pure white or have small black spots near the outer edges. Oval spherical, 0.5 mm in diameter, pale yellow-green, 'turns gray-green or grayish-brown, shiny, egg-faced with depressions. Larvae have "black head type" and "red head type", our country is "black head type". The head, chest shield, and buttocks are all black and glossy. They are 28-35mm long, with many changes in body color, mostly yellow-green to gray-black. The lateral lines from the body to the back are gray brown or dark brown with wide longitudinal bands, body side and ventral gray. Yellow, back midline, valve on line, valve off the line are light yellow; dorsal hair tumors are black, the side of the tumor is orange, hairy tumors are born with white hairy clumps, mixed with black hair, and some are brown hairy bundles. Chest black; black outside the gastropod, toe hook with a special order in the middle belt, the middle long toe hook 10 - 14 roots, 22-24 hooks at both ends of the little toe. The dragonfly is 8-15mm long, dark reddish-brown, with 8-17 breech, thorn-shaped at the end of thorn, and depressed in the middle. Oval-shaped, yellow-brown or dark gray, composed of sparse filaments of mixed larvae that form a net.
Living habits The two generations of Liaoning born in winter, with crickets under the tree, litter and other quilts and various gaps in the winter. Adult stage: Overwintering from mid-May to mid-July, first generation from early August to early September. The first generation of the egg period is 9-19 days, and the second generation is 6-11 days. Larval period 30-58 days. The first generation of larvae hatched in late May, and entered the stage of infestation from mid-June to late July; the second generation of larvae died from mid-August to late September. 9 In the first half of the year, it began to turn winter. The first generation of the flood season is 9-14 days, and the wintering generation is 8-9 months. Adults live in a nocturnal manner, have phototaxis, and flight power is not strong. The eggs are prolific in the back of the leaves, hundreds of lumps, monolayers, and overlying female tail hairs. A few hours after the newly hatched larvae spun silk nets, in the net after colony feeding leaves, with the growing larvae grow net screen, larvae were a total of 7 instar, 5 years after the dispersion damage. The larvae have strong hunger-resistance and can stay on food for 4 to 15 days, spreading by means of transportation and wind. Natural enemies include spiders, grasshoppers, stinkbugs, parasitoids, Beauveria bassiana, and nuclear polyhedrosis viruses.
Prevention and control methods (1) Strict quarantine, comprehensive census, grasp of the epidemic situation, immediately report to the relevant departments after discovery. (2) Cut off the egg masses and insect nests and concentrate on burning. Insecticides are sprayed on the damaged plants and the trees within 50m around them; the second-generation larvae can be used to trap the larvae on the trunks before being matured, and they are immersed in the phlegm and then burned. (3) Biological control Bacillus thuringiensis or American white plague virus, in which the virulence of nuclear polyhedrosis virus is stronger, controls larvae. (4) Completely removing weeds, litter and other ground cover before adult emergence of overwintering adults, and centralizing treatment to eliminate overwintering earthworms. (5) Prevention and control of larvae before 3rd age, refer to Mulberry caterpillar (Sangjiania zeae).
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