Morphological traits and bionomics of Scolytus schevyrewi Seme. (Coleoptera: Scolytidae)

The banded elm bark beetle (BEBB), Scolytus schevyrewi Seme. (Coleoptera: Scolytidae) is one of the elm boring pests. The morphological traits and bionomics of BEBB, including life cycle, adult lifespan, habits and mating behaviors, were observed in the laboratory and in the field in Yanchi county, Ningxia Province. There were two generations of BEBB per year. The pest overwintered in the form of mature larvae (98.2%) and pupae (1.8%). Mature larvae began to pupate in early May with a peak of pupation in mid May. Adults started to emerge from late May with a peak in early June. Second generation larvae pupated from late June till early July with a peak in late July and pupation ending in early August. The average lifespan of female and male adults was significantly different; (27.14 [plus or minus] 3.74) d for females and (16.86 [plus or minus] 4.13) d for males (P < 0.05). Diapause was not observed. Four kinds of natural enemies of BEBB; Elachistocontrum sp., Pedieuloids ventricosus Newport, Thansimus sp. and Labidura sp., were found.