Yellow poplar silk borer

Diaphaniaperspectalis (Walker), also known as yellow poplar black edge borer moth, belongs to the family Lepidoptera.

[distribution and harm]:

Distributed in Shaanxi, Hebei, Jiangsu, Zhejiang, Shandong, Shanghai, Hubei, Hunan, Guangdong, Fujian, Jiangxi, Sichuan, Guizhou, Xizang and other places. Harm to Populus tomentosa, Populus tomentosa and so on. Larvae often use silk to connect the surrounding leaves as temporary nests, in which they feed, and when they are serious, they eat up the leaves, resulting in the death of the whole plant.

[morphological characteristics]:

Adults: all covered with white scaly hairs, body length 20~30mm, wingspan 40~50mm. The forechest, the base of the front wing, the front edge, the outer edge and the outer edge of the rear wing, and the end of the abdomen is covered with black-brown scaly hairs, so it is called the black edge borer moth. Antennae filiform, brown, with more than 100 nodes, its length can reach the end of the abdomen. The wing surface is translucent with fuchsia flash. There are two white spots in the middle chamber, one small and one crescent-shaped. It is easy to distinguish between male and female, 2 female wing reins, thick abdomen, no hair plexus at the end of the abdomen, 1 male wing rein, thin abdomen, and black hair plexus at the end of the abdomen.

Eggs: oblong, smooth bottom, protruding surface, long 1.5mm, yellowish green at first birth and dark brown at near hatching.

Larvae: cylindrical, full-length 42mm when mature, black-brown head, dark green chest and abdomen, glossy hairy tumor and sparse burr on the surface. The topline is green, the subtopline and the upper valve line are dark brown, the valve line is yellowish green, the baseline and ventral baseline are light cyan, both sides of the topline are yellowish green, and the light bluish gray between the subtopline and the upper valve line.

Pupa: fusiform, long 18~20mm. The pupation is emerald green at first, then light cyan to white, wing buds and compound eyes dark brown to black. There are 8 gluteal spines at the end of the body, arranged in a row, and the apex curls into a hook.

Cocoon: the mature larvae pupate in the cocoon. The cocoon is composed of silk leaves. The cocoon is oval and 40mm long.

Life habits:

Three generations a year occurred in Nantong, Jiangsu Province, and the larvae overwintered in the nest composed of two leaves of the host. The overwintering larvae began to feed in late March. The pupal stages of the overwintering generation and the first and second generation were 12-18 days, 6 days and 7-11 days, respectively. The larvae are generally 6th instar, a few 5th instar, and the overwintering generation larvae are 9-10 instar. After Eclosion, the adults mate at night and lay eggs the next day, and most of the eggs are laid on the back of the leaves, with 153-222 eggs per female. After hatching, the larvae begin to feed after 5-12 hours, and feed on 80-100 leaves in a lifetime. During the feeding period, silk is often used to connect the surrounding leaves as temporary nests. After the overwintering larvae make their nests, they molt and pupate.

[prevention and control methods]:

During the spawning period of adult ①, the egg blocks are examined and removed every 2-3 days, which can be easily found in the morning or evening when the sun is oblique. By making use of the nest habits of the larvae during the feeding period and the overwintering pupae in the nest, the collected eggs and nest cocoons can be burned in time.

Spray 1000 times of 50% fenitrothion emulsion, or 1000-1500 times of 50% phoxim emulsion, or 200-400 times of Bacillus borer during the larval damage period of ②.