How to control the leaf-eating pest dancing poison moth?

Dancing poison moths, also known as persimmon caterpillars, swing caterpillars, etc., belong to the lepidoptera poison moth family. It is widely distributed and has a heterogeneous diet. It is mainly distributed between 20° and 58° north latitude in China, such as Hebei, Shanxi, Inner Mongolia, Liaoning, Jilin, Heilongjiang, Jiangsu, Fujian and other places. The insect feeds on more than 500 species of plants such as poplar, willow, birch, maple, elm, linden, beech, walnut, apple, pear, apricot, cherry, hawthorn, spruce and so on. Among them, oak, poplar, willow, elm, apple, hawthorn and birch suffered the most. Larvae are used to harm the leaves, and in severe cases, the whole leaf can be eaten. The following small series for everyone to introduce the insect in detail, I hope to bring help to everyone in the prevention and control.

First, the morphological characteristics

Eggs The egg is round, slightly flattened on both sides, 1.3 mm in diameter, initially apricot-yellow, later turned brown, and the eggs are densely packed together to form an egg with yellow-brown villi.

Pupae its body length is 19 to 34 mm, the female pupa is larger, the male pupa is small, the body is reddish brown or black brown, still has yellow-brown villi.

The larvae are 50-70 mm long, the head is yellow-brown, and the front has a "figure eight" black stripe; The back of the carcass is grayish-black, the dorsal line is yellowish brown, the ventral surface is dark red, and the thorax and gastropods are dark red. Each segment has 6 hairy columns, with a pair of bright colors in the center of the back, blue-gray in the l-5 segments, purple-red in the 6th-11th segment, and brownish-black short hairs on the upper parts. The hairs on both sides of each segment are covered with long yellow-white and black hair bundles, and the hairs on both sides of the anterior thorax grow, and the upper hairs are long black hair bundles. The 6th and 7th abdominal segments each have a red columnar gland in the center of the dorsal center, also known as the constriction gland.

Adults Are Hermaphroditic, males 18–20 mm long, 45–47 mm wingspan, dark brown. The head is yellowish brown, the antennae are pinnate brown, and the dry dorsal side is off-white. The outer edge of the forewing is darkly banded, the remainder is slightly grayish-white, and there are 4-5 dark brown wavy transverse lines on the wing surface; There are black-brown round spots in the center of the middle chamber, 4 black-brown "<"-shaped markings on the transverse veins at the middle ventricle, and 7-8 black spots between the outer edge veins. The hindwings are paler, the outer edges are thicker and banded, and the transverse veins are darker. The female is 25-28 mm long, with a wingspan of 70-75 mm, and is bleak and yellowish. The antennae are black and short pinnate, and the transverse lines on the forewings are similar to the markings and males, and are dark brown; The hindwing has a brown wavy transverse line near the outer margin; There are 7 dark brown dots between the outer veins. The abdomen is enlarged and densely covered with yellowish-brown scales.

Second, life habits

In 1 generation per year, the larvae that have completed embryonic development overwinter in the eggs. The eggs are in the bark, in the middle of the stone crevices. The tree begins to hatch from April to May of the following year when it sprouts. 1-2 instar larvae cluster on the tree day and night, lying still during the day and feeding at night. The larvae have the habit of spitting silk and sagging, and spreading by the wind. After 3 years of age, he hid under the weeds of the bark cracks or stones at the base of the trunk during the day and went up the trees at night to feed. In early to mid-June, most of the larvae mature and crawl to the hidden places during the day to pupate. Adults feather from mid-June to early July, peaking in late June. Males have the habit of flying during the day.

III. Comprehensive prevention and control measures

1. Eliminate the body of the overwintering insect, such as scraping the egg block of the dancing moth, searching for the wintering larvae, etc.

2. For larvae with upper and lower tree habits, 1 to 2 closed loops (ring width 1 cm) can be drawn on the trunk with a cypermethrin poison pen, which can poison and kill larvae, the mortality rate is 86% to 99%, and the residual effect is 8 to 10 days. Poison ropes can also be tied to prevent the larvae from going up and down the tree.

3. Lights trap adults.

4. Manual removal of egg blocks and clusters of hatching larvae. Before the larvae overwinter, the overwintering larvae can be booby-trapped in the dry bass bundle.

5. Pharmaceutical control. At the larval stage, the tree insects were sprayed with a net 800-1000 times liquid, 2.5% cypermethrin emulsion 4000 times liquid, 25% urea III. glue suspension 1500-2500 times liquid, etc.; Spray the egg blocks with a 5% high-potency cypermethrin 4000x liquid.

Prevention and control of new technologies. Use root eradication to apply control, according to the chest diameter of garden trees, according to 1g (medicament)/1cm (chest diameter) root application, after application, pour 15kg of water, wait for the water to dry after burying the soil. It can also be used according to the dosage of 0.3g (drug) / 1cm (chest diameter), mixed with water 300 ~ 500mL infusion. These two new methods work very well, the effective period can reach 3 to 6 months, and do not kill natural enemies, do not pollute the environment, simple and easy, especially suitable for the control of tall tree pests.