Sweet Potato Small Tortoiseshell

The scientific name is Taiwania circumdata (Herbst) Coleoptera. Alias ​​sweet potato Taiwan turtle shell, sweet potato green turtle shell. Distributed in Fujian, Taiwan, Hainan, Guangdong, Guangxi, Yunnan, Guizhou, Sichuan, Jiangxi, Hunan, Hubei, Zhejiang, Jiangsu and other provinces.

Host sweet potatoes, leeks and convolvulaceae plants.

Injury characteristics, larvae eaten into nicks or holes.

Morphological characteristics Adult body length 4.2-5.6mm, semi-spherical, arched body back, yellow-green to blue-green, with metallic luster, pronotum, two sheath wings all extend outward into a "tortoise" shape, extending Part of the reticular pattern, the back of the front center of the back of the back there are 2 close-up black stripes, some merged together, the back of the cowhide wings at the edge of the bulge on the edge of a black to dark brown "V"-shaped plaque, a longitudinal slit at the seam, Thickness varies, and some disappear. Antennae eleven, light green, some 2-3 dark brown ends, extending backwards through the sheath wings shoulders. The egg is about 1mm long, dark green, long oval. The last instar larvae are 5mm long, oblong, and bulging from the middle of the body. The worms have 16 pairs of thorns. The front two are on one tumor, and the two on the back are very long. It is twice as many as the other thorns. Tails.

About 5mm in length, flat and rectangular in shape, light green, and large in the back of the chest. Surrounded by small thorns, the head is concealed under it. There are 1 large flat spinous processes on both sides of the 1-5 abdominal segments.

Living habits 4 generations in Zhejiang, Jiangxi, Hunan 4-5 generations, 5 generations in Sichuan, 6 generations in Fujian, 5-6 generations in Guangdong, adults overwintering in weeds, dead leaves, stone seams or earth seams, Zhejiang temperature 14 Above °C, overwintering into the tortoiseshell is harmful to sweet potato seedlings. The first generation will be propagated in mid-late and late May. The age of each adult will be as follows: 1st generation late June, early July, 2nd generation, late July, 3rd generation, late August , Four generations in late September and early October, winter in late October to mid-November. Every year in mid-June, late-August and late-June, the victim is heavy. Feeding begins 1-2 days after emergence and has a long lifespan. Zhejiang was 29 days old, 63 days old, 74 days old, and 181 days old. One week after emergence, the oviposition spawns. The spawning period is long: 6-103 days in Jinjiang, Fujian. The egg production per female is 497-697, 35 are fewer, and the maximum is 2315. The eggs are scattered around the veins and the larvae are 5 instars. The mature larvae do not eat at the shade of the potato leaves. After 1-2 days, the tail adheres to the back of the leaves, and the pupa period is about 5 to 9 days.

See the control method of sweet potato wax turtle A subspecies.

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