Scientific name Omphisa anastomosalis (Guen6e) Synonyms Omphisa illisalis (Walker) Lepidoptera, Gnatidae. Alias ​​sweetpot stupid, sweetpotato moth, sweetpotato rattan. Distributed in Fujian, Taiwan, Hainan, Guangdong and Guangxi.
Host sweet potato, sand rattan and convolvulaceae plants.
The damage characteristics of the larvae into the potato stem damage, resulting in the formation of hollow stalk hollow stalk, affect nutrient delivery, causing withering, affecting growth and development.
Morphological characteristics Adult body length 13-16mm, male wingspan 30-37mm, female 30-40mm, head, chest, abdomen gray. The lower lip must extend toward the front of the head, 2.5-3 times longer than the head, and the compound eye is large and dark. The fore wings are yellowish, brown on the fins, and the center has reticular markings. They are irregular, and there are 2 wavy stripes near the outer edge. The male body color is often deeper than the female. Oval oval-shaped, light green, 2-3 days after childbirth turned yellow-brown, showing a small red spot. The newly hatched larvae have black heads and turn yellow-brown after 2 years of age, and are red-brown when they are old. The body was slightly yellowish-brown. After the second quarter, there were 12 spots with various spots, including 4 valves on the upper and lower sides and 4 on the back, which were trapezoidal.蛹 Light yellow to reddish brown with prominent head, wing buds reaching the end of the fourth abdominal segment, thoracodorsal central longitudinal bulge, abdomen distally blunt, with 8 hooks.
Life habits Guangdong 4-5 generations old, mature larvae in winter potatoes or residual potato overwintering, late spring in mid-December phlegm, in late March into adulthood. The first generation was in early April and the middle of May. The second generation was in late May and early July, the third generation was mid-July and mid-August, the fourth generation was mid-September and late October, and the fifth generation was early November. Adults are hidden during the day, nocturnal activities, phototaxis, spawning at night after mating, spawning period of 6-7 days, egg production in the bud, petiole or stem of the tillers, individual several rows into a row, egg period 4 -10 days. Newly hatched larvae penetrate from the petiole, leaf buds and stems. The larvae plucked from the tender stems attacked the main stems after being injured for a period of time. The larvae liked to feed on the stems. They often drilled to the stems or rhizomes under the top soil, and some drilled into the tubers. The injured part of the stem enlarges adult worms and often excretes excrement, which is one of the important features to identify the worm. After the larvae are mature, white or yellow phlegm and white pods are formed at the basement hole near the basement of the soil. Natural enemies include Pheropsophus sp., Colladdasp., and Xanthopimpla stemmator Thunberg. Prevention methods (1) After harvesting potatoes, clean the pastoral areas in time to reduce the number of overwintering populations. (2) Rotation. (3) Drug treatment of potato seedlings. Cut 1-2 days before planting seedlings, use 40% Dimethoate EC 1000x or 90% crystal trichlorfon, 80% dichlorvos EC 800-900 times for seedbed spraying or dipping with dimethoate solution 1-2 Minutes later. (4) The insecticides are sprayed 5 to 7 days after the peak of adult emergence. (5) Attach 1-2 heads of unfertilized female moths to insect traps to effectively trap insects at the age of adults.
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