Alfalfa Stem Anatomy and Potato Leafhopper (Homoptera: Cicadellidae) Resistance

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Medicago clones with different levels of resistance were examined histologically and by in vitro digestion in rumen fluid to determine if anatomical features of the stem contribute to resistance to the potato leafhopper, Empoasca fabae (Harris). Glandular hairs, stems with small cross-sectional areas, and highly lignified tissues were associated with potato leafhopper resistance. A cylinder of hard tissues, composed of lignified xylem elements, phloem fibers, and interfascicular areas, surrounded the pith and was linked to reduced oviposition. The hard cylinder was present in the first internode (from apex) of two of the resistant clones and in older, more distal internodes of other clones. Early lignification of tissues forming the cylinder appeared to contribute to potato leafhopper resistance either by mechanically or by chemically deterring or preventing feeding and oviposition.

Document Type: Research Article

Publication date: October 1, 1986

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  • 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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