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Within-Root Mortality of Cylas formicarius (Coleoptera: Apionidae) by Entomopathogenic Nematodes

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Abstract:

Within-root mortality of sweetpotato weevil, Cylas formicarius (F.), by six strains of entomopathogenic nematodes in the families Steinernematidae and Heterorhabditidae (Steinernema carpocapsae [Weiser] [=Neoaplectana carpocapsae, Steinemema Feltiae] AlI and Mexican strains; Steinernema feltiae [Filipjev] [=Steinemema bibionis] N-27 strain; Steinernema glaseri [Steiner]; Heterorhabditis bacteriophora Poinar [=Heterorhabditis heliothidis] HP88 strain; and Heterorhabditis sp. FL2I22 strain [an un-described nematode isolated in Florida]) was tested in several buried-root bioassays. The ability of nematodes to locate and kill weevils, and the location within the root where infection occurred, were measured. In addition, mortality of the weevils in roots that were artificialIy infested in the laboratory was compared with mortality in naturally infested roots from the field using two concentrations of one nematode (s. carpocapsae Mexican strain). In general, the heterorhabditid nematodes caused higher levels of mortality within the root than the steinernematids. Heterorhabditis sp. FL2122 strain killed the highest proportion of weevils in the shortest period of time. Similar differences among nematodes were seen in the inner portion (1/2 radius) of the storage roots, as well as ill the outer portion. Although weevil mortality in the artificially infested roots was greater than in the naturalIy infested roots, the trends in mortality were similar; we observed increased mortality in the nematode treatments compared with the control and no difference in mortality between the two nematode concentrations.

Document Type: Research Article

Publication date: June 1, 1993

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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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