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Movement of Lycoriella mali (Diptera: Sciaridae) Through Mushroom-Growing Medium

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Knowledge of the location of Lycoriella mali (Fitch) in mushroom-growing medium throughout the insect's life cycle may enable mushroom growers to direct control efforts where the insects are concentrated, thus reducing control costs and insecticide usage. Compost and casing, exposed to a laboratory colony of L. mali, were divided into several horizontal layers by nylon netting that did not inhibit insect movement. At regular intervals (3-5 d) after exposure to L. mali, each layer of medium was extracted to determine the number and stage of insects in the layer. Insects were extracted from the medium by screening, differential sucrose densities, and centrifugation. Females penetrated the compost to a depth of 5.7 cm to oviposit, but most eggs were laid at 1.9-3.8 cm. As larvae hatched and matured, most moved deeper into the compost. Late fourth in stars or pupae migrated to the upper level of the compost. Very little movement into casing occurred when the compost was infested before casing was added; infestation of casing resulted from exposure of the medium to flies after the casing was added. Results indicate that directing control efforts to the upper few cm of compost would provide the greatest return for the effort.

Document Type: Research Article

Publication date: February 1, 1988

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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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