Dasychira thwaitesi Moore, a genus of lepidoptera, poison moths.
【Host】Fruit trees such as lychee and longan.
[Pest] second to third instar larvae bite young leaves, and after three instars, the larvae eat the leaves after turning green, resulting in leaf lack of carving.
【Morphological characteristics】Adult female adults are 21 to 26 mm long and have a wingspan of 70 to 76 mm; the antennae are feathery, the ctenophores are brownish yellow; the tibia and tarsal segments of the foot have black-brown spots, the rest are grayish white; the abdomen is grayish white; the forewings are scattered with small black-brown scales, and the scales are arranged in inconspicuous outer lines, and the outer lines have black-brown spots; and the hindwings are white. Larvae The terminal larvae are 45 to 48 mm long, the head and feet are yellowish white, the body is grayish or gray-green, the body is grayish white or lemon yellow or the front half is gray-black, the rest is yellow, long villi, small spines. There is a large dark black spot between the dorsal segments of the first and second ventral segments, and a lemon-yellow long hair bundle with small spines in the center of the center of the eighth ventral segment. Pupae Pupate are pale white at first and gradually turn yellowish brown. The abdomen has a large yellow-brown hair patch on the back of the first to third segment, and a long, thick gray-white hair at the fourth to the tail segment. Each abdominal segment has a hairy clump on each side, the same color as the ventral dorsal hair clump.
【Life Habits】 Generations are unknown. The larvae often live in groups before the third instar, for the harm of the green leaves, after the third instar disperse activities, bite the turned green leaves, the old mature larvae spit silk on the longan, lychee sticking leaves and villi, forming a loose pupal cocoon. And in it pupate, adult worms have phototropism. Occurs from March to December throughout the year. In Guangzhou, in early August, it began to harm lychees and longan autumn shoots.
【Control measures】Refer to the control of lychee poison moth. (1) Do a good job of cleaning the orchard and eradicating the weeds in the garden, which can reduce the harm. (2) Pharmaceutical control can refer to the control of lychee coarse shin green moth.