Host plant mediation of diapause induction in the cabbage beetle, Colaphellus bowringi Baly (Coleoptera: Chrysomelidae)

摘要

The cabbage beetle, Colaphellus bowringi Baly (Coleoptera: Chrysomelidae), is a serious pest of crucifers in China, undergoing an imaginal summer and winter diapause in the soil. The effects of host plants on diapause incidence were tested in the beetle. The ratio of adults entering diapause was significantly low when they fed on the mature leaves of Chinese cabbage Shanghaiqin (Brassica chinesis var communis) than those feeding on Chinese cabbage Suzhouqin (Brassica chinesis var communis), radish (Raphanus sativus var longipinnatus) and stem mustard (Brassica juncea var tumida) at 25 °C combined with 13:11 (L: D) h. Fewer adults entered diapause on young leaves compared to physiologically aged and mature radish leaves at 25 °C combined with 13:11