FEEDING RESPONSES OF CHORISTONEURA-FUMIFERANA (LEPIDOPTERA, TORTRICIDAE) LARVAE TO SUGAR EXTRACTS FROM DEFOLIATED AND UNDAMAGED WHITE SPRUCE

To examine feeding behavior of spruce budworm, Choristoneura fumiferan a (Clemens), larvae during their development, we measured feeding pref erences and feeding rates of early and late instars exposed to foliar carbohydrate fractions of currently defoliated and undamaged white spr uce, Picea glauca (Moench) Voss. No significant differences in feeding preferences of third and sixth instars were found between currently d efoliated and undamaged trees. Sugar fractions extracted from current- year and 1-yr-old foliage seem to have the same stimulating effect on feeding preference for the two instars. On the other hand, significant differences were found between relative feeding rates of early and la te instars.