Spodoptera litura Prodenia litura ( Fabricius ) of Lepidoptera, noctuidae. Synonym of Spodoptera litura ( Fabricius ). Autographa californica, alias lotus lotus armyworm. Distribution throughout the country.
Host oil Lai, cabbage, cauliflower, cabbage, radish and other cruciferous vegetables, Solanaceae, Cucurbitaceae, leguminous vegetables, taro, onion, mint, leek, spinach and crop amounts to 99, more than 290 kinds of.
Damage characteristics of the larvae eat leaves, buds, flowers and fruits, serious when can the field crops up in cabbage, Chinese cabbage, can bore into the leaves, leaves the ball, and fecal excretion, contamination and decay, so that the loss of commodity value.
Morphological characteristics of adult body length 14 ～20mm, 35 ～ 40mm exhibition wings, head, chest, abdomen are dark brown with white tufts of chest, back, abdomen before the Festival back center with dark brown tufts. Forewing greyish brown, markings in complex, horizontal and horizontal gray white, wavy, separated by a white stripe, in ring patterns and kidney shaped line, from the front edge to the back edge margin of the 3 white lines, named Spodoptera litura. Hind wing white, without markings. The hindwings are often water red to purplish red flash. The egg flat half spherical, diameter of 0.4～ 0.5mm, primiparous yellow-white: turn green, before hatching purple black. The eggs are gathered into the 3 ~ 4 layers of egg masses, covered with grayish yellow loose hairs. The mature larva grow 35 ～47mm, head dark brown, an inner body due to host and population density varies: yellow, greenish yellow, brown or dark green, the back line, subpopulations of dorsal line and subspiracular line are pale yellow and orange yellow. From the thoracic to the ninth abdominal segment in subpopulations of dorsal medial triangular black spots on line 1, which in first, 7, 8 abdominal segment of the biggest, thoracic legs nearly black, abdomen dark brown. The pupa is long about 15～ 20mm, red abdomen, back fourth to seventh day near edge each have thousands of little moment. Hip spine short, with a pair of powerful curved spines, spines branched basally.
Living habits in North China the year 4 ~ 5, 5 ~ 6 generations of catchment of the Yangtse River, Fujian from 6 to 9, in Guangdong and Guangxi, Fujian, Taiwan can breed throughout the year, without wintering phenomenon, in the Yangtze River basin to the north of the region, the problem of wintering there is no conclusion, presumably spring insect source from southern migration. The possibility of catchment of the Yangtse River, in August seventh, the Yellow River basin in September eighth occurrence. The nocturnal, flying force flies, one can fly tens of metres, up to 1Om above, adult phototaxis, and sweet and sour wine and fermentation of carrot, malt, bean cake, cow dung and taxis. The need to supplement nutrition, feeding molasses average egg 577.4, failed to consumers can only produce the number of grains. Prolific in the tall, thick egg, green marginal crop to plant, leaf blade abaxially. Most central vein. Egg development period of about 7 days, 22 ℃, 28 ℃for approximately 2.5 days. The newly hatched larvae feeding before the age of 3 cluster, only food residues on the epidermis and mesophyll, veins, white yarn shape after the turn yellow, easy identification. After age 4 in bulimia, much in the evening out damage. A total of 6 instar larvae, growth period is about 27 days at 21 ℃, 26 ℃and 30℃ for approximately 17 days, about 12.5 days. Mature larvae in 1 ~ 3cm soil soil chamber built inside pupation, soil hardens when leaves of pupation. Pupal development period, from 28 to 30 ℃for approximately 9 days, from 23 to 27 DEG C for about 13 days. The development of Spodoptera litura suitable high temperature ( 29～ 30 ℃), thus over seriously harmed period is in form July to October .
Control method of 1 ～3 instars, with 10000000000 per /ml Empedobacter brevis suspending agent 100ml exchange water 45～ 50kg spray mist.
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