Rice rice margin
Scientific name Leptocorisa acuta (Thunberg) Hemiptera, marginal fusion family. Alias ​​rice spider edge edge, rice ear edge, different rice edge edge. Distributed in Guangdong, Guangxi, Hainan, Yunnan, Taiwan and other provinces. Host rice, corn, beans, wheat, sugar cane and a variety of grass weeds. Damage characteristics, nymphs sucking juice, affecting grain maturity. Morphological characteristics Adult body length 16-19mm, width 2.3-3.2mm, grass green, body black small engraved dots, long head, lateral leaves longer than the middle, straight forward. There is a short longitudinal depression in the center of the head. The tip of section 1 of the tentacles slightly inflates and is shorter than the sum of the length of the mind.喙 达 reached the base of the middle foot, the end black. Prosthodontic plate is long, dense and conspicuously engraved dots, light brown, no obtuse more rounded corners. The leading edge of the fore-wing leathery part is green, and the brown tea is brownish. The membranous part is dark brown. Male spores are wide at the base and taper slightly at the ends. Egg yolk brown to brown, 1.2mm long, 0.9mm wide, oval top view, side to see the flat bottom circle, smooth surface. A total of 5 instar nymphs. The worm has 4 related species. Edge of rice (L. costalis), L. lepida, L. chinensis, and L. varicornis. (Figure left) Living habits Yunnan 3-4 generations, 4 generations in Hainan Wenchang, Guangxi 4-5 generations, with adults in the fields or in the weeds or shrubs in the ground for winter. Overwintering adults in Yunnan and Hainan began to appear in the middle and late March, and spawned in mid-April. In mid-June, the second generation of adults appeared to injure white rice and rice. In mid-July, they entered three generations. In late August, four generations occurred. In mid-October, There are 5 generations. The adult period is 60 to 90 days, and the wintering generation is about 180 days. The nymph period is 15-29 days. The nymphs and nymphs like to be active in the daytime and live in the shade at noon. After 10 days of eclosion, they copulate in the daytime. After 2-3 days, the eggs are laid on the leaves, spawning both day and night. Each 5-10 grains are arranged in a single row. Sometimes, Two lines or scattered, spawning continued 11-19 days, egg period 8 days, 76-300 eggs per female. Gramineous plants are heavy for a long time. See the method of prevention and treatment of rice margin spine.
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