Abstract:

Pineus armandicola Zhang is an important defoliator of armand pine(Pinus armandi). The study of the biology of the pest was carried out systematically in the No.222 Forest Farm, Dongchuan District of Kunming, Yunnan Province. The alternate host —likiang spruce and the sexual generation of the pest were found for the first time. That shows Pineus armandicola has a complete life cycle. It lives and attacks on both armand pine and likiang spruce, and its sexual generation takes place on the first host. The morphs on likiang spruce are sexules, fundatrices(overwintering by second or third instar nymphs in the leaf sheaths of likiang spruce) and gallicolae in proper order. Finally the alate gallicolae fly to armand pine and produces sistens, and overwinter by nymphs in the leaf sheaths and bark crevices of armand pine. Independently, the pest can also finish its incomplete life history on armand pine as alienicola, which can at most have six generations per year through female parthenogensis in Dongchuan district. The phenomenon of generation overlapping is common.

Key words: Pineus armandicola Zhang, Biology, Alternate host, Armand pine, Likiang spruce