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Scientific name: Thosea sinensis(Walker)?

Alias: Robinia pseudoacacia, Illicium verum, Illicium verum can, Zanthoxylum bungeanum, Ovum Wax can and Nitraria tangutorum belong to LEPIDOPTERA acaricidal plants. ?

Distribution and harm:?

Distributed in Heilongjiang, Jilin, Liaoning, Hebei, Shandong, Anhui, Jiangsu, Zhejiang, Hubei, Hunan, Jiangxi, Fujian, Sichuan, Yunnan, Shaanxi and other places. Harm camellia, poplar, gardenia, begonia, rose, Pterocarya stenoptera, Buxus macrophylla, Cinnamomum camphora, Platanus acerifolia, Ulmus pumila, Willow, Bauhinia, Plum, Peony, Peony, Osmanthus fragrans, Magnolia grandiflora, Wei Zi, Wisteria, Prynne, Ficus microcarpa, Myrica rubra, Sophora japonica, Erythrina.

Larvae feed on leaves to form holes, which will leave petioles or main veins in severe cases, affecting tree potential and ornamental.

Morphological characteristics:?

Adult: the female moth has a body length of 13~ 18mm, a wing length of 28~35mm and a brown body; The apex angle of the front wing is inclined to the brown line at the rear edge; The anterior wing is dark grayish brown, and the medial chamber extends obliquely to the posterior edge. Male body is about 10mm, wing spread is 26 ~ 31mm; There is a black spot on the upper corner of the male moth; The hind wings are grayish brown; There is a white spot on every joint of the chest and feet, which is an important feature that is easy to distinguish. ?

Egg: oblate, ovoid, long 1. 1~ 1.4mm, grayish brown before hatching and yellowish green before initial hatching. ?

Larvae: It is about 2 1~24mm long, relatively flat, with a slightly raised back, resembling a tortoise shell. All of them are green or yellow-green, with white topline and 10 verrucous protrusions on both sides of the body. There are bristles on it. There are two small tufts of bristles on the back of each 1 segment, and a red dot on both sides of the back of the fourth segment. ?

Pupa: nearly oval, shaped like a bird's egg, with a body length of 10~ 15mm and light dark brown. ?

Cocoon: light brown, cocooned in adjacent shallow soil.

Living habits:?

Hebei, Shaanxi and other places 1 year 1 generation, the Yangtze river basin 1 year occurs 2 generations, and a few 3 generations. In Nanchang, Jiangxi 1 year, there are 2~3 generations, mainly the second generation, and the mature larvae cocoon in the soil for the winter. Pupating from mid-April to mid-May of the following year. ?

Most of the second-generation cocoons spend the winter, and only a few of them appear in a year and continue to reproduce. The local 3rd generation larvae (165438+1early October) froze to death. Throughout the year, the occurrence of 1 generation is relatively large. The egg period of Nanchang 1 is 6-8 days for the second generation and 7-8 days for the third generation. The larval stage is ***8 years old, and the duration of each generation is 1 generation 25~32 days, the second generation 23~27 days, and the third generation 3 1~38 days respectively. The cocoon period is 1 generation 14~26 days, and the inner pupa period is 9~ 16 days. The emergence of the second generation is 229~238 days, and the inner pupa stage is 19~28 days. The third generation 199~288 days, and the inner pupa stage is 18~28 days. ?

The emergence time of adults is 18:00-20:00. Lying on the back of leaves or weeds during the day, active at night, with strong phototaxis, the maximum time is 2 1:00 to the next day 1:00. Laying eggs the night after mating. Eggs are mostly laid on leaves, occasionally on the back of leaves, scattered. The newly hatched larvae feed on eggshells first, then turn to the back of leaves after the 2nd instar, and the 6th instar larvae feed on the whole leaves, leaving only the petiole. In severe cases, the whole plant can be eaten up, which affects the growth of the tree and reduces the ornamental value.