Flavanonol Glucoside and Proanthocyanidins:Oviposition Stimulants for the Cerambycid Beetle, Monochamusalternatus

Masashi SATO, Syed Q. ISLAM, Shinobu AWATA and Toru YAMASAKI

J. Pestic. Sci. 24, 123-129 (1999)

An oviposition stimulant for the cerambycid beetle, Monochamus alternatus, from an aqueous acetone extract of inner bark of Pinus densiflora, was identified as a flavanonol glucoside, (-)-2,3-trans-dihydroquercetin-3'-O-b-D-glucopyranoside. Two dimeric proanthocyanidins, along with polymeric proanthocyanidins, were also isolated from the extract and identified as procyanidins B-1 [epicatechin-(4b­›/FONT>8')-catechin] and B-3 [catechin-(4a­›/FONT>8')-catechin]. In the presence of a fraction of the extract, a mixture of the polymers and either B-1 or B-3 stimulated oviposition of the female beetle. However, the glucoside, B-1, B-3 and the polymers were inactive alone.