Abstract
The feeding response of the strawberry leaf beetle, Galerucella vittaticollis Baly, to quercetin glycosides found widely in polygonaceous plants was investigated. Feeding was stimulated by five quercetin glycosides: avicularin (quercetin 3-arabinoside), hyperoside (quercetin 3-galactoside), isoquercitrin (quercetin 3-glucoside), quercitrin (quercetin 3-rhamnoside) and rutin (quercetin 3-rutinoside), but not by peltatoside (quercetin 3-arabinoglucoside). In a leaf-feeding test with 11 polygonaceous plant species, leaves of Fagopyrum esculentum were fed on most by the beetles. Next in preference order were Rumex japonicus, R. acetosa, Polygonum aviculare, R. obtusifolius, P. Blumei, P. Thunbergii, P. cuspidatum, P. sachalinense, R. acetosella and P. perfoliatum. The feeding stimulants, hyperoside, isoquercitrin, quercitrin and rutin were detected by HPLC and TLC analyses in all these plant species except R. acetosella and P. perfoliatum, which were least preferred by the beetles.
