What are the characteristics of the green poplar wedge beetle? How does the poplar wedge beetle harm

The green poplar wedge beetle is also known as the green poplar beetle. It is harmful to silver poplar, Hebei poplar, mountain poplar, plus poplar, small green poplar, small leaf poplar, drill poplar, Beijing poplar and so on. Feed on the branches, especially the tips of the branches; Spindle-shaped galls are formed in the victims, which hinder the normal transportation of nutrients, dry up the branches, and are susceptible to wind breaks, or cause the trunk to be deformed, bald, and affect the maturity of the tree.

If it is harmful to the pith of the main trunk of the young tree, it can cause the whole plant to die.

Morphological characteristics] Adult.

Body length 11-14 mm. The body is black, densely covered with golden yellow hairs, interspersed with long black hairs. Compound eyes are black.

The antennae are whip-shaped, the antennae of males are about equal to the length of the body, and the antennae of females are shorter than those of the body; The peduncle is thick, the peduncle is the shortest, all black, the base of each node of the whip 2 3 is grayish-white, and the end 1 3 is black. There are no lateral spines on the prothorax, the back is flat, and there is a wide golden-yellow longitudinal band on each side. The elytra are covered with black rough punctations and have pale yellow hairs.

There are 4 5 round spots composed of golden yellow hairs on each of the two elytra. The golden round spots on the elytra of males are not obvious.

Ovum. Long ovate, slightly pointed at one end, slightly curved in the middle. It is about a millimeter long and millimeters wide.

Larvae. It is milky white at the time of first incubation, light yellow at middle age, dark yellow when mature, and has a body length of 10 to 15 mm. The head is yellowish-brown, the cranium is retracted very deep into the anterior chest, the lower jaw is 3 segments, the lower lip is 2 segments, and the dorsal plate of the prothorax is ossified and yellowish-brown.

Valve brown. There is 1 distinct midline on the back of the body.

Chrysalis. 11-15 mm long, brown, ventral dorsal midline distinct.

Biological characteristics].

1 year and 1 generation, with mature larvae overwintering in the gall of the branches. Pupalation begins in late March, and the pupal period is 20-34 days. Adult worms begin to emerge in mid-April.

The eggs are found in early May, hatch into larvae in mid to late May, and invade young shoots, and overwinter begins in early and mid October. The adult emergences are more concentrated, generally the most around noon during the day, and the most active. After the adult emerges, it often feeds on the edge of the leaves as a supplementary nutrient, and after about 2 5 days of copulation, 1 life can copulate many times, and the eggs begin to lay after about 2 days after copulation.

Before spawning, the ovipositor is used to probe the tips of the branches, and then the palate is used to bite into a horseshoe-shaped groove to lay eggs. The grooves are mostly on 2-year-old shoots. In the severely damaged area, there were multiple galls on one branch.

Adults prefer to move in open stands and forest edges, so isolated trees, sparse trees, and branches around and above the canopy are severely damaged. The maximum number of eggs produced by a female is 14 49 eggs. The lifespan of females is 10 to 24 days, and males are 5 to 14 days.

The egg stage is 10 days. The hatched larvae infest the phloem on both sides of the groove, and after 10 to 15 days, they bury into the xylem, and the infested site gradually expands to form an oval-shaped gall, and the larvae excrete feces and bitten wood chips are piled up in the insect tract, and sometimes squeezed out of the cracks in the egg scars. In early October, the larvae are old and mature, and the bored sawdust is stuffed at the end of the insect path, which is the pupal chamber, and the larvae overwinter in it.

The natural enemies are the beetle bee and the swollen-legged wasp, and the parasitic larvae and pupae have a certain effect on inhibiting their numbers.

P. glacifolia is the main branch pest of poplar in North China, Northwest China and other regions. One generation occurs in one year, and the mature larvae overwinter in the galls of the branches. The gall formed by P. glacifolia has a long impact on the annual growth of branches, and the impact is large, harming Populus chinensis, Populus tomentosa, Populus microphylla, Populus alba, Populus silver, Salix huanghua, Salix alba and Salix glauca.

It is distributed in Inner Mongolia, Jilin, Liaoning, Hebei, Shaanxi, Gansu, Shandong, Jiangsu, and Henan.

The poplar wedge beetle, also known as the poplar longhorn beetle, is a pesting poplar salix plant, which eats the branches with larvae, especially the branch tips; Spindle-shaped galls are formed in the victims, which hinder the normal transportation of nutrients, dry up the branches, and are susceptible to wind breaks, or cause the trunk to be deformed, bald, and affect the maturity of the tree. If it is harmful to the pith of the main trunk of the young tree, it can cause the whole plant to die.

The adult body is 9 14 mm long and the body width is mm. The body is narrow and long, the base color is black, densely covered with pale yellow hairs mixed with long black-gray erect hairs. There is a pale yellow or golden yellow longitudinal stripe on each side of the middle area of the dorsal plate of the prothorax plate.

Each elytra has 4 or 5 yellow villous round spots, which are not obvious in males. The antennae are mostly covered with gray villi on each segment from the 3rd segment, and the ends are black.

The eggs are about millimeters long and white.

The larvae are yellowish-white, 10-15 mm long when mature, and the head and prothorax dorsal plate are yellowish-brown. There is a distinct midline on the dorsal body of the body.

Pupae 11-15 mm long, milky white with a brownish gradient, and the dorsal midline of the abdomen is distinct.

The name of the insect is Coleoptera, cerambycidae. It is distributed in Heilongjiang, Liaoning, Shaanxi, Gansu, Ningxia, Qinghai, Xinjiang, Inner Mongolia, Shandong, Shanxi, Henan, Hebei and other provinces (autonomous regions) in China. It is also found in Siberia and the Caucasus in the Soviet Union, North Korea, Europe, southern North Africa, etc.

It is harmful to various poplars such as poplar, silver poplar, and poplar. It often harms the main shoots of annual seedlings and young trees, and is prone to cause heavy losses in nurseries and young forests.