Comparative Toxicity of Pesticides to Edovum puttieri (Hymenoptera: Eulophidae), an Egg Parasitoid of the Colorado Potato Beetle (Coleoptera: Chrysomelidae)
Authors: OBRYCKI, JOHN J.; TAUBER, MAURICE J.; TINGEY, WARD M.
Source: Journal of Economic Entomology, Volume 79, Number 4, August 1986 , pp. 948-951(4)
Publisher: Entomological Society of America
Abstract:Four of six pesticides used in potato pest management were highly toxic to adults of both the Mexican and Colombian biotypes of Edovum puttlert Grissell when exposed to cages dipped in pesticide solutions. In general, older parasitoid immatures within Colorado potato beetle (CPB), Lepttnotarsa decemlineata (Say), eggs were less susceptible than adults and younger immatures. Susceptibility between the Mexican and Colombian biotypes also differed. The insecticides methamidophos, fen valerate + piperonyl butoxide (PBO), and rotenone + PBO caused between 97 and 100% adult mortality within 24 h. Exposure of adults to the insect growth regulator triflumuron caused no reduced survival at 1 and 7 days posttreatment compared with H2O and undipped controls. Following exposure to the fungicide Du-ter (triphenyltin hydroxide), mortality was lower for the Colombian E. puttleri. than for the Mexican at both 1 and 7 days postexposure. The reverse was true for sodium fluoaluminate. Young (1–2 days old), immature E. puttleri (within CPB eggs) of both biotypes were highly susceptible to fenvalerate + PBO and triflumuron. However, neither methamidophos nor triphenyltin hydroxide significantly reduced the survival of either biotype. Rotenone + PBO and sodium fluoaluminate reduced the survival of young immature E. puttleri to ca. 10 and 20%, respectively. The percentage emergence for older (7–8 days) immature E. puttleri (within darkened CPB eggs) was significantly reduced after exposure to fen valerate + PBO.
Document Type: Research Article
Publication date: August 1, 1986
- 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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