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Concentration-Mortality Response of Phyllophaga hirticula (Coleoptera: Scarabaeidae) to Three Entomogenous Nematodes

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LC..,sof Steinernema carpocapsae (Weiser), S. glaseri (Steiner), and Hetemrhabditis heliothidis (Khan, Brooks & Hirschmann) to third-instar Phyllophaga hirticula (Knoch) were 210, 86, and 12 nematodes per grub, respectively, when administered as peroral injections. Bioassay of the three nematodes against P. hirticula larvae in soil arenas without food, however, failed to produce discernible concentration-mortality responses. Observations indicated that, although infective nematodes remained in the soil and on the grubs 2 wk after application, a large proportion of the nematodes migrated from the soil immediately after application. Thus, the actual concentration of nematodes in the arenas was less than the concentration applied, and probably accounted for the lack of response in bioassays in soil arenas.

Document Type: Research Article

Publication date: June 1, 1991

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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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