Canadian Forest Service Publications
Flavonol glycosides from four pine species that inhibit early instar gypsy moth(Lepidoptera:Lymantriidae)development. 1997. Beninger, C.W.; Abou-Zaid, M.M. Biochemical Systematics and Ecology 25:505-512.
Available from: Great Lakes Forestry Centre
Catalog ID: 33100
CFS Availability: PDF (request by e-mail)
Early instars of gypsy moth (Lymantria dispar l.) generally do not feed on pine (Pinus) species, perhaps due to secondary compounds found in pines. To test this hypothesis, ethanolic extracts from jack pine (Pinus banksiana Lamb). red pine (Pinus resinosa Ait.). scotch pine (Pinus sylvesltis L) and white pine (Pinus sttobus L) (Pinaceae) needles were prepared. Extracts from alt four pine species. when incorporated into artificial diet. Significantly reduced weight and increased mortality for 2nd instars. A purified ethanolic fraction from jack pine (fractionated on a polyvinyl polypyrrolidine (PVPP) column with a 100% water to 100 ethanol gradient). containing phenolics and fl avonol glycosides significantly reduced growth and increased mortality of gypsy moth 2nd instars. Eight flavonol glycosides were isolated from the four pine species, two of which (rutin and quercetin-3-0-glucoside) were common to all four species. These two compounds, and the aglycone quercetin. when incorporated into diet. significantly reduced grow1h of gypsy moth 2nd instars. These results suggest that early instars of gypsy moth are sensitive to pine flavonols. and the presence of these compounds may be one reason they do not generally feed on pines until later instars.
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