Douglas-Fir Needle Anatomy in Relation to Western Spruce Budworm (Lepidoptera: Tortricidae) Herbivory
Authors: BURR, KAREN E.; CLANCY, KAREN M.
Source: Journal of Economic Entomology, Volume 86, Number 1, February 1993 , pp. 93-99(7)
Publisher: Entomological Society of America
Abstract:We compared 23 anatomical characteristics of current-year needles from five pairs of Douglas-fir, Pseudotsuga menziesii var. glauca (Beissner) Franco, trees that were either phenotypically resistant or susceptible to western spruce budworm, Choristoneura occidentalis Freeman, defoliation. The trees were mature (44-101 yr old) and were paired by size and microsite. Repeated-measures analysis of variance indicated needles from resistant trees were Significantly longer, had thinner epidermal layers, and had proportionately more transfusion and less mesophyll tissue than needles from susceptible trees. There was no evidence that needle toughness or resin canal size was associated with resistance to budworm herbivory. It appears unlikely that anatomical features of the needles affect resistance to the budworm. The observed differences in needle anatomy may have resulted from stresses associated with repeated defoliation of the trees that were susceptible for reasons other than their anatomy.
Document Type: Research Article
Publication date: 1993-02-01
- Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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