The scientific name is Antigastra catalaunalis Euponchel, Lepidoptera. Alias ​​sesame seeds. The distribution ranges from Jiangsu and Henan in the north, to Taiwan, Guangdong, Guangxi, and Yunnan in the south, from the seashore in the east and Sichuan and Yunnan in the west. It is an important pest of sesame-producing areas south of the Yangtze River.
Host sesame seeds.
The larvae spit, entangle the flowers, leaves or drill into the flower center, tender stems, and pods to eat, often eat the seeds, and the pods turn black and fall off.
Morphological characteristics Adult body length 7-9mm, wingspan 18-20mm, gray-brown body; forewing light yellow, veins orange-red, internal and external horizontal lines brown, near the front edge has not obvious 3 chloasma. The hind wings are yellow-gray, and there are 2 dark spots with little obvious on the wings. Eggs are about 0.4mm long, oblong, milky to pink. The last instar larvae have a body length of 16 mm, a dark brown head, green or yellow-green or light gray to reddish-brown. On the back of the chest, there are two dark-brown long-spots, four on the back of the chest and one on the back of the chest, and six on the back of the abdomen. About 10mm in length, gray-brown.
Habits Habits Henan and Hubei sesame-producing areas have four generations of annuals, and live in the winter. In late July and late November, adults become active, adults have phototaxis, but flying power is not strong, hidden in sesame during the day, mating spawning at night, eggs prolific in sesame leaves, stems, flowers, pods and young shoots, eggs After 6-7 days of hatching, the newly hatched larvae feed on the leaves or drilled into the flower cores and pods for about 15 days. The mature larvae in the pods or leaflets, between the stem stalks, phlegm, pupa, 7 days, adult In 9 days, one generation is completed and lasts for 37-38 days. Generations overlap.
Prevention methods (1) Clean the pastoral areas after harvest to eliminate overwintering lice. (2) Strengthen field management and remove weeds from fields and fields. (3) Use black light to trap adult insects. (4) Spray 90% crystal trichlorfon 800 times solution or 50% Bataan WP 1000 times solution and 2.5% kungfu emulsifiable concentrate 3000 times solution in the early stage of larvae. (5) When planting, use 3% carbofuran (keweiwei) granules to spread 2-4m/667m2 into the sowing ditch, then cover the soil.
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