Identification and control of Euonymus mandshurica

The peach leaf armyworm, commonly known as "hanging ghost", belongs to the family Lepidoptera. The larvae only have a pair of feet at the 6th ventral segment and the distal segment. As if measuring things with the fingers, it is also called inchworm. It is mainly harmful to Populus tomentosa, Euonymus, elm, poplar, willow and so on. It is a polyphagous pest.

I. morphological characteristics and habits

Adults: medium-sized moths. The wingspan is 33mm and 52mm, and the body is yellow. There are two black spots on the middle chest dorsal plate. The abdominal lateral plate and dorsal plate are all yellow. The bottom of the wing is white and covered with gray and tawny spots. There is a yellow and brown color spot at the base of the front wing. There is also a yellowish-brown spot on the arm corner of the front and rear wings. There are several gray spots on the outer edge of the forewing. The feet are yellowish brown and there is a black spot on the outside of the forefoot.

Eggs: hemispherical, grayish purple, 0.8 mm in diameter, with fine longitudinal stripes on the surface. There is a dot in the center.

Larvae: the body length of mature larvae is 28,32mm. The body of the worm is black, with 4 yellow and white vertical lines on each side. The longitudinal lines near the middle line of the back and the valve line are yellow, and there are white horizontal stripes on each node at the back end.

Pupa: wedge-shaped, 5.5 mm long, dark brown, short.

Two generations a year occur in Shenyang area, overwintering as pupae. The first generation of salty worms appeared from mid-May to mid-June. The larvae were in the peak stage in the first and middle of July. The second generation of adults appeared from mid-July to late August. The larvae were in the peak stage in the first and middle of September. The flying ability of adults is poor, they can lay eggs after mating, and each female lays 30,350 eggs. Eggs are often laid on withered shoots or leaves, often more than 10 or dozens of eggs are arranged into blocks. The larvae are 5th instar. Have the habit of spinning and sagging. The morphology of larvae often varies with different seasons, spring and autumn larvae, black stripes and yellow stripes alternate, and some summer larvae are yellowish gray. When the larvae mature in late September, they often spin silk and fall to the ground or climb back to the ground from the tree trunk. Pupate under the litter layer. The pupa stage is 10 days, and the overwintering pupa is more than 250 days.

II. Prevention and control measures and methods

1. The prediction of the first generation larvae was done from the middle of June to the middle of July. Once a pest occurs, medicine should be administered immediately to kill the pest.

two。 10 days after the emergence of adults or larvae, spray 1500 times of dichlorvos EC or 2.5 times 5000 times of dichlorvos EC on the canopy. Spray twice in a row, 10 days apart, apply medicine in the morning and evening, and spray after rain.

3. Manual hunting. ① can shake the trunk of small trees and seedlings and kill vibrating larvae and pupae. Most of the ② larvae were pupated on the tree trunk.

4. Protect natural enemies such as parasitic flies, wasps, etc.

5.The adults were trapped and killed by light in early May, early July and early August.