The scientific name plagiodera versicolora (Laicharting) belongs to the order Coleoptera, Phylloidea. Alias ​​Liu Yuan Ye Jia. Distributed in Heilongjiang, Jilin, Liaoning, Inner Mongolia, Gansu, Ningxia, Hebei, Shanxi, Shaanxi, Shandong, Jiangsu, Henan, Hubei, Anhui, Zhejiang, Guizhou, Sichuan, and Yunnan.
Host corn, soybeans, cotton, mulberry, various willows.
Injury is characterized by larvae feeding the leaves into nicks or holes.
Morphological characteristics Adult body about 4mm long, nearly round, dark blue, with a metallic luster, wide head, tentacles, 6 bases, small base, more coarse, brown to dark brown, fine hair; pronotum transverse Broad and smooth. Coleoptera is densely engraved on the finer points of the engraved line, with a deeper, more glossy body surface. Eggs are orange-yellow, oval in shape, piled upright on the foliage. The larva is about 6mm in length, gray-brown, with dark brown bulges on the whole body, and the chest is wide, with 4 dark spots on each side of the body and mastoid on both sides. It is 4mm long, elliptical, yellow-brown and has 4 dark spots on the back of the abdomen.
Habits of life in Henan 4-5 generations, Beijing, 5-6 generations, with adults in the soil, deciduous and weeds in winter. In April of the following year, the willows sprouted out of the plant and attacked buds and leaves. They laid eggs on the leaves and piled up in rows. Each female laid more than one thousand eggs and the egg period was six to seven days. The newly hatched larvae clustered and ate the leaves. The larval period is about 10 days. The mature larvae are larvae on the leaves. Adults and larvae can be seen at the same time in mid-September.
Control methods (1) Severe damage can be sprayed with 20% chrysanthemum emulsion 2000 times solution or 50% phoxim EC 1000 times, 50% malathion EC 1000-1500 times solution, 20% ciprofloxacin WP 2000 times liquid.
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