Biological Studies on the Du-ensiform Gall Aphid, Kaburagia rhusicola Ⅰ. Life History

The Du-ensiform gall caused by Kaburagia rhusicola is one of the Chinese gallnuts. In their whole life history they undergo following stages in order of seasons: the males and the females, fundatrix, wingless and winged fundatrigeniae on the first host (tree), Rhus potaninii, on which the galls are formed; and wingless aliencolae, winged sexuparae on the second host(moss), Erythrodontium leptothallum. Among the progeny of the same generation of fundatrix, some of them completed a life cycle in a year, some in two years, perhaps some in more than two years. The aphids live in a gall for about three months. The migration from the second hosts to the first hosts occur in spring and from the first hosts to the second hosts in the late summer. No diapause or dormancy can be found in the aphid's life history.