Soil bioassay for studying behavioral responses of wireworms (coleoptera: elateridae) to insecticide-treated wheat seed.

Soil bioassay for studying behavioral responses of wireworms (coleoptera: elateridae) to insecticide-treated wheat seed. Research Abstract Details 

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Soil bioassay for studying behavioral responses of wireworms (coleoptera: elateridae) to insecticide-treated wheat seed. Abstract Text:

Willem G van Herk,Robert S Vernon,Willem G van Herk,Robert S Vernon,

A bioassay for observing wireworm behavior in soil is described. The bioassay permits analysis of orientation, feeding, repellency, and postcontact toxicity behaviors of wireworms in response to insecticide-treated wheat seeds. Wireworm positions were recorded every 5 min for 3 h, and the time required to orient to and contact seeds, and the duration of individual feeding events, was calculated. Both avoidance (before contact with seeds) and repellency (after contact) were quantified. A high proportion of Agriotes obscurus (0.95), Limonius canus (1.00), Ctenicera pruinina (0.80), Melanotus communis/dietrichi (0.80), and Hypolithus sp. (0.70) larvae contacted untreated wheat seeds and began feeding within 120 min when seeds were preincubated for 60 min in soil with 20% moisture. A smaller proportion of A. obscurus contacted seeds if seeds were not incubated in the bioassay before wireworm introduction (0.80) or in soil with 10% moisture (0.65). L. canus larvae required a significantly shorter time (25.3 min) to contact seeds if seeds were incubated for 60 min than if seeds were not incubated before wireworm introduction (43.1 min). Wireworms exposed to untreated seeds and seeds treated with the fungicide Dividend XLRTA fed normally (i.e., sustained feeding for at least 60 min), but a significant proportion of wireworms exposed to seeds treated with Tefluthrin 20 CS (containing the synthetic pyrethroid tefluthrin) fed for 15 min or less and were subsequently repelled. Wireworms exposed to Vitavax Dual (containing the organochlorine lindane) were not repelled after feeding and showed symptoms of illness for up to 28 d before making a full recovery (89%) or dying (11%).

Soil bioassay for studying behavioral responses of wireworms (coleoptera: elateridae) to insecticide-treated wheat seed. Publishing Authors By Initials

WG van Herk,RS Vernon,WG van Herk,RS Vernon,

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Soil bioassay for studying behavioral responses of wireworms (coleoptera: elateridae) to insecticide-treated wheat seed. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Environmental entomology

VOLUME: 36

Page Numbers: 1441-9

Journal Abbreviation: Environ. Entomol.

ISSN: 0046-225X

DAY: 20

MONTH: Dec

YEAR: 2007

Soil bioassay for studying behavioral responses of wireworms (coleoptera: elateridae) to insecticide-treated wheat seed. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Soil bioassay for studying behavioral responses of wireworms (coleoptera: elateridae) to insecticide-treated wheat seed.

AFFILIATION: Agriculture and Agri-Food Canada, Pacific Agri-Food Research Center, Box 1000, 6947 No. 7 Highway, Agassiz, British Columbia V0M 1A0, Canada. vanherkw@agr.gc.ca.

Country: United States

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MEDLINETA: Environ Entomol

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