he withered leaves armyworm, Lepidoptera, Noctuidae, Latin name Adristyrannus ( Guenee ), body length of 35 to 38 mm, the exhibition wings from 96 to 106 mm, the head and thorax abdomen brown, apricot. Antenna filiform. Forewing leaves dark brown color green; the top is very sharp, outer arcuate ramps, posterior edge of the central concave trailing edge from vertex to sag; there are 1 black brown line; dark brown veins inside; there are many black and brown dots; wing base and the central dark green round thread. Hind wing apricot, mid 1 reniform spot. The front end to the M2 vein; sub region of L horn black lines.
Egg: oblate 1 ~ 1.1 mm, 0.85 to 0.9 mm, the top and bottom are relatively flat, milky white.
Larva: length 57 ~ 71 mm, first front end is pointed, often curved, 2 abdominal segments, the eighth abdominal segment has a bulge, to seventh ～the 10 abdominal segment into 1 peaks. Red brown plain. Body yellowish brown or grayish brown, dorsal line, subpopulations of dorsal line, valve line, inferior belly line and ventral line are dark brown; the second, the 3 abdominal segment of the back of the 1 eye spotted, black and white stripes with middle crescent, the periphery of yellow-white around the black circle, each somite cloth has many irregular the white stripes, the sixth abdominal segment of dorsal line and mild abdominal line has 1 irregular square white, there are many brown circle and dot. Thoracic lateral black brown, base the Ministry is pale inner white; gastropod yellow-brown, crochet single sequence in the belt, first pairs of gastropod is small, from second to 4 on gastropods and hip toe hook are in 40 above. Valve long oval black, eighth ventral valve than seventh section is slightly big.
Pupa: length 31 ~ 32 mm, reddish brown to black brown. The head is slightly 1 central cusp, the head and thorax of dorsal and ventral areas there are many coarse regular folds back; belly is smooth, light and thin.
In Zhejiang, Huangyan for 1 years 2 to 3 generations, the adults only. Field 3 ～ November can be found in adults, but more in autumn. Eggs in the wild have more time for early June, August and early September, but due to low hatching rate of eggs, larvae mortality is high, the amount is not much. In Guangdong, adult citrus damage when ask in the middle of August to December, in which the damage early Wenzhou Mandarin from mid August to late August to early September, kill the Sheng, in ripe orange varieties from the middle of September began to suffer, in late September to late October suffered the most abundant. The number of eggs on the underside of the leaves, constant grain production in. First instar larvae are spinning habits, still often to 3 on a ground of gastropods, all shaped like an "U" or "? ". Has been found in larval host wood, grass and wood, tet ten merit. Adults in suspended animation during the day after dark habit, latent, trapeze orchard fruit damage, like choosing health fruit damage. Citrus fruit killed, initially for the small pinhole, and the glue liquid outflow, later extended to corky, water stains of elliptical spot, the last full fruit rot, a lees.
Recommended prevention methods: hatching peak, each with 10000000000 /ml 667m2 spores Empedobacter brevis suspending agent from 80 to 100 ml versus 45 kg water spray mist. |
