Rice Sesamia inferens walker, Sesamia inferens ( Walker ) of Lepidoptera, noctuidae. Alias rice borers, purple stems armyworm moth, mainly rice, maize, sorghum, harm, millet, wheat, sugar cane reed, rape, white, barnyard grass and other.
Morphological characteristics of the adult female moth: body length 15mm, the wing exhibition about 30mm, head, chest and abdomen brown, pale yellow to grayish white; forewing antenna filiform, nearly rectangular, grayish brown, with black points between 4 rows of four angle. The male body length of about 12mm, the wing exhibition 27mm, pectinate antennae. Egg white oblate, beginning after becoming gray-yellow, surface with thin vertical lines and horizontal lines, aggregated or scattered, often formed into 2 ~ 3 lines. Last instar larval body length of about 30mm, rough 4 head is reddish brown to dark brown, a total of 5～ 7 years old. The pupa is 13 to 18mm in length, thick, reddish brown, abdomen with white powder, cremaster 3 hooked spines.
Damage characteristics: basic and same of chilo. The larvae bore into the rice stem damage, can also cause dieback, dead heart seedling, dry booting, and insect damaged strains of white ear. The main difference: Sesamia inferens damage hole is larger, has a large number of insect feces stalk. Sesamia inferens caused by the damage of dry sapling, wormhole, frass, and most are not in rice stems, leaf sheath and culm number sandwiched in between, victimization rice stem leaves, leaf sheaths are yellow. Sesamia inferens caused by dead heart seedling field field more, less in the middle, but also different from the rice stem borer, insect species caused by dead heart seedling.
Recommended prevention methods: when the blight sheath rate reaches 5% or starts to see a dead heart seedling damage form, i.e. most of the larvae in the 1 to 2 age stages, each with 10000000000 /ml 667m2 spores Empedobacter brevis suspending agent from 80 to 100 ml of status of the water about 45 kilograms spray mist.
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