Effects of Temperature and Host Age on Suppression of Diaprepes abbreviatus (Coleoptera: Curculionidae) by Entomopathogenic Nematodes
Authors: Shapiro, David I.; Cate, James R.; Pena, Jorge; Hunsberger, Adrian; McCoy, Clay W.
Source: Journal of Economic Entomology, Volume 92, Number 5, October 1999 , pp. 1086-1092(7)
Publisher: Entomological Society of America
Abstract:Effects of temperature and host age on the biocontrol potential of entomopathogenic nematodes against the sugarcane rootstalk borer weevil Diaprepes abbreviatus (L.) were tested under laboratory conditions. Virulence and reproductive potential were compared among 3 nematode species: Steinernema riobrave (Cabanillas, Poinar & Raulston), Heterorhabditis bacteriophora Poinar, and H. indica Poinar, Karunakar & David. Assays were conducted in plastic cups filled with moist sand. Three soil temperature regimes (21, 24, and 27°C) and 5 larval ages (20, 30, 40, 50, and 100 d old) were combined in various treatments. The larval ages were estimated to represent 4th–10th instar. Older larvae (i.e., 100 d old) were less susceptible to nematode infection than younger larvae. Nematodes were less virulent at 21°C than at 24 or 27°C. The virulence of H. indica was greater than H. bacteriophora in 50-d-old D. abbreviatus larvae at all temperatures, and greater than the other 2 nematode species in 20-d-old larvae at 24°C. Heterorhabditis bacteriophora was more virulent than S. riobrave in 20-d-old larvae (at 24°C), whereas S. riobrave was more virulent than H. bacteriophora at 21°C (in 50-d-old larvae). Reproductive potential was greatest in H. indica followed by H. bacteriophora. The high level of reproduction in heterorhabditid species indicates a potential for nematode recycling in field applications. We conclude that temperature and host age should be considered critical factors in determining the time of nematode application.
Document Type: Research Article
Publication date: 1999-10-01
- 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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