Leaflet Abscission Caused by Alfalfa Blotch Leafminer (Diptera: Agromyzidae)

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Leaflets mined by a single larva of Agromyza frontella (Rondani) in third-cutting alfalfa abscised an average of 12.9 days after the larva emerged from the leaflet to pupate in the soil; no leaflets remained on the plant at harvest 29 days later. In contrast, nearly one-half of the unmined control leaflets remained on the plant at harvest, and control leaflets which abscised did so an average of 4 days later than mined leaflets. Abscission of mined leaflets was detectable in first- and second- Cutting alfalfa only if harvest was delayed at least 10 days. Since harvest at full-bud stage minimized, whereas late harvest maximized, the number of leafminer larvae which matured to pupate in the soil, cultural methods can help reduce leafminer populations.

Document Type: Research Article

Publication date: October 1, 1983

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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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