Feeding Preferences of Fourth- and Sixth-Instar Spruce Budworm (Lepidoptera: Tortricidae) Larvae for Foliage Extracts from Young and Old Balsam Fir Hosts
- 1 June 1994
- journal article
- research article
- Published by Oxford University Press (OUP) in Environmental Entomology
- Vol. 23 (3) , 645-653
- https://doi.org/10.1093/ee/23.3.645
Abstract
Feeding behavior of fourth- and sixth-instar spruce budworm, Choristoneura fumiferana Clem., toward aqueous extracts of balsam fir (Abies balsamea (L.) Mill.) foliage from terminal and lateral shoots of young and old trees is described. Fourth instars prefer extracts from terminal shoots of young and old trees. This feeding preference is correlated with the content of N in the foliage and the feeding rate is correlated with the N/tannin ratio. Sixth instars show a strong preference for extracts from lateral shoots of young trees. Their feeding preference is correlated with the sucrose content of the foliage, whereas their feeding rate is correlated with the glucose content. Age-related variation in bud worm larval feeding preference may be an important evolutionary adaptation for the spruce budworm, enabling it to respond positively to naturally occurring seasonal changes in the nutritional quality of its host plant and to chemical changes induced by defoliation.Keywords
This publication has 0 references indexed in Scilit: