Phassua Butler Lepidoptera Distribution of Liaoning, Jilin, Heilongjiang, Hunan, Anhui and other provinces.
Host forsythia, cloves, ginkgo, Schisandra, hawthorn and other medicinal plants and fruit trees, trees and so on.
The larvae are damaged by the characteristic traits. The surface of the xylem is engraved into a ring-shaped hollow pit, causing the branches to grow weak and vulnerable to wind-break. When the damage is heavy, the branches will die.
Morphological characteristics Adult body length 32-36mm, wingspan 61-72mm, body color changes are large, mostly brownish brownish brownish green, brownish brown, brownish brown. There are seven semi-circular markings on the front edge of the forewing, a dark-brown, dark-green triangular large spot in the center of the wing, and a wide transverse band composed of juxtaposed fuzzy curved spots on the outer edge. The hind wings are dark brown. After the male and female legs, dense orange-yellow brush hairs. Oval, diameter 0.6-0.7mm, black. The larvae have a body length of 50-80mm, a brown head, body milky white, and a cylindrical shape. Cylindrical, yellow-brown.
Living habits Liaoning born a generation, a few 2 years and 1 generation, with eggs on the ground or larvae in the branches of the pith part of the winter. Incubation began in May of the following year, and in the middle of June it was infested in fruit or weed stems. It began to phlegm in early August. Embryated as adults in late August, entered the peak period in September, adult eclosion, eggs laid on the ground, each female can lay eggs 2000-3000, egg hatching between April and May of the following year. The newly hatched larvae feed on weeds first and then invade the stems. In June-July, they are transferred to nearby woody hosts and feed on branches. In the two years of the 1st generation, the victims were evacuated in August of the following year, and they fell into adults one month later. When the eclosion occurs, part of the clam shell emerges. Natural enemies include Beauveria bassiana, Willow-fly moth, and other small insects.
Control methods (1) Clear the weeds in the garden in time and concentrate them deeply or burn them. (2) In late May, the branches are painted white to prevent damage. (3) Cut off the damaged branches in time. (4) In late May and early June, the young larvae will be sprayed with 50% parathion EC 1000 times or 25% ECA 1500 times in the active period on the ground. After the middle-aged larvae have drilled into the trunk, 80% of the dichlorvos EC can be dropped into the wormhole 50 times.
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