Mortality of Ligyrus subtropicus (Coleoptera: Scarabaeidae) by Entomogenous Nematodes in Field and Laboratory Trials

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Abstract:

Studies on control of Ligyrus subtropicus (Blatchley) by two entomogenous nematodes showed that field releases of Steinernema feltia Filipjev (Strain All) did not cause a significant reduction in the number of L. subtropicus grubs in sugarcane, Saccharum spp. Field releases of S. glaseri (Steiner) also failed to significantly reduce the number of grubs, but S.glaseri appeared to be more effective than S.feltia. Differences in the mean percentage of dead grubs per 0.61 m of row (16.6% for S. glaseri and 2.7% for S. feltia) were detected between plots treated with S. glaseri and control plots 6 wk after treatment. Differences in total percentage of grub mortality between plots treated with S.glaseri (50.57%) and control plots (11.13%) 8 wk after the release of S. glaseri also were significant. Bioassays exposing Galleria mellonella (L.) larvae to nematodes from dead grubs collected in plots treated with S. glaseri resulted in significantly higher mortality of G. mellonella in the treated group than in the control group. In laboratory tests, mortality of pupae and adults was 100 and 42%, respectively, when each was treated with 5,000 S. glaseri nematodes.

Document Type: Research Article

Publication date: June 1, 1989

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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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