A survey of psocid species infesting stored grain in China and resistance to phosphine in field populations of Liposcelis entomophila (Enderlein) (Psocoptera: Liposcelididae)

摘要

Psocids have recently become a serious problem in grain storages in China. A survey of the distribution of psocids in grain storages was carried out as a basis for understanding the reasons for this phenomenon. Four species of psocids were detected.Liposcelis entomophila (Enderlein) was the most common and widely distributed, followed by Liposcelis decolor Pearman. Liposcelis paeta Pearman and Liposcelis mendax Pearman were also detected in a few storages. Ten strains of L. entomophila were testedfor resistance to phosphine. All strains showed resistance compared with a susceptible reference strain, with resistant factors ranging from 40 to 80 times. Resistance to phosphine appears to be the major factor determining psocid infestation in grain storage facilities in China.