Formation of the gallery system of Cryphalus sp. in Ulmus pumila L.
Author of the article:WANG RongREN LiLiLIU ChunXingLUO YouQing**
Author's Workplace：Beijing Forestry University, Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing100083, China
Key Words：Cryphalus, Cryphalus sp., biological characteristics
Abstract： Morphological sexual dimorphism and the formation of the gallery system of the elm bark beetle Cryphalus sp. in Ulmus pumila L. were studied systemically. Male and female adults are similar in length, but secondary sexual characteristics are visible. The main difference lies in whether the frontal plane bulges and the number of scales on the notum of the metathorax. One male adult can have one to three mates at most, but it was difficult to find one male with three females in one gallery at the same time. The formation of this beetle’s gallery system is mainly divided into five stages，including invasion, courtship display and mating, formation of the main gallery, spawning and sub-gallery formation, and takes about 40 days to complete.