Scientific name Bombyx mandarina Leech Synonyms Theophila mandarina Moore is a lepidoptera, silkworm moth family. Alias ​​silkworm, mulberry dog ​​and so on. Distribution from the north of Heilongjiang, northeast Inner Mongolia, south to Taiwan, Fujian, Guangdong, Guizhou, Yunnan.
The host mulberry tree, wolfberry and so on.
The characteristics of the larvae are larvae feeding young leaves of mulberry trees into nicks, leaving only the main veins. When a large number of larvae occur, the young leaves of the mulberry trees are eaten. Affects the growth of mulberry trees and the development of sericulture.
Morphological characteristics Adult moth female body length 20mm, 46mm wingspan, male small moth. The whole taupe. Antennae dark brown feathered. On the forewings, there are dark brown markings. The outer corners are concave in the direction of the top corners. There are 2 brown stripes on the fins, and a dark brown crescent pattern between the 2 stripes. The hind wings are tan. Egg length 1.2mm, transverse diameter 1mm; flat oval, early white yellow, later turned gray. The last-instar larvae are brown and speckled. Four-age body length 40-65mm, small head, chest 2 and 3 special expansion, the back of the second thoracic node has a pair of black lines, all around the red, the back of the 3rd thoracic section has 2 dark brown round lines, the second abdominal section The back has 2 red-brown horseshoe-shaped patterns, the 5th abdomen has 2 light-colored dots on the back, and the 8th-abdominal-node has 1 horn. Gray and white, oval.
Living habits Liaoning born 2 generations, Shandong 2 - 3 generations, 4 generations of the Yangtze River Valley, with eggs in the branches of mulberry winter. The Yangtze River Valley began to hatch in mid-April of the year, and Liaoning was hatched in the middle and early May. The incubation period is very long, and there is still hatching until July. The fourth-generation larvae in the Yangtze River Basin occurred in late April, late June, early August, and early September, and there was a clear overlap between generations. The second generation in Shandong is seriously affected, and the larvae of each generation are in mid-May, mid-July and late August to early October, and the last adult lays over the winter. Adults like to feather in the daytime. They lay eggs shortly after emergence. Eggs grow together on branches or trunks. There are 3 or 5 grains to more than 100 grains. The arrangement is not neat. The number of eggs laid per female varies from generation to generation, with a maximum of 228 grains and a minimum of 118 grains. Female moths live for 2-8 days, 4 generations 10 to 20 days, male moths are short. Non-overwintering eggs are 8-10 days in the egg stage and 204 days in winter. The larvae hatch at 6-9, and the young larvae colonize the young shoots, which damages the growing larvae. The third instar silkworms are 12 to 16 days old, 4 to 14 days old, and the mature larvae are in the back or two leaves. , petiole base, branch decentralization office spinning silk knots phlegm. The first generation of the flood season is 22 days, the second generation is 12 days, the third generation is 14 days, and the fourth generation is 45 days. The natural enemies include wild silkworm black egg bees, wild silkworm black cockroach bees, and broad leg bees.
Control methods (1) Combine the pruning, scrape off the overwintering eggs on the branches, pay attention to the non-overwintering eggs on the shoots, and reduce the number of insects. (2) Larval larvae are killed at the younger age of each generation of larvae when they are attacked by shoots or shoots. (3) Take care to remove the sputum at the back of the leaf or at the parturition. (4) If necessary, combine 80% of dichlorvos EC 1500 times or 90% dipterone 1200 times, 25% ECS 1500 times, and 48% chlorpyrifos (Losburns) in combination with other pests on control mulberry trees. Emulsion 1300 times.
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