Probing Behavior of Eulachnus agilis and Injury to Scotch Pine1,2
Authors: BLISS, JR., M.; YENDOL, W. G.; KEARBY, W. H.
Source: Journal of Economic Entomology, Volume 66, Number 3, June 1973 , pp. 651-655(5)
Publisher: Entomological Society of America
Abstract:Adults of the aphid, Eulachnus agilis (Kaltenbach), inserted their stylets through the stomata of needles of Scotch pine, Pinus sylvestris L. Stylet penetration through plant tissue was predominantly intracellular. The feeding site appeared to be the phloem. Stylets of both unstarved and starved aphids reached the phloem in about 10 minutes. When unstarved and starved aphids were allowed to probe for 5, 10, 15, and 30-minute intervals, depth of penetration was significantly greater for unstarved aphids only when allowed to probe for 30 minutes.
In laboratory and field studies, E. agilis caused chlorosis and premature dropping of Scotch pine needles. Histological studies of healthy and chlorotic needles showed no mechanical or physical changes in the plant tissue. No apparent morphological changes occurred in the phloem or other tissues in chlorotic needles. However, salivary secretions of E. agilis possibly could have affected the plant tissue physiologically, subsequently causing the symptoms of chlorosis.
Document Type: Research Article
Publication date: June 1, 1973
- 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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