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Long-term persistence and efficacy of spinosad against Rhyzopertha dominica (Coleoptera : Bostrychidae) in wheat

Daglish, G.J. and Nayak, M.K. (2006) Long-term persistence and efficacy of spinosad against Rhyzopertha dominica (Coleoptera : Bostrychidae) in wheat. Pest Management Science, 62 (2). pp. 148-152.

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Article Link(s): http://dx.doi.org/10.1002/ps.1141

Publisher URL: http://www3.interscience.wiley.com/cgi-bin/home

Abstract

A laboratory study was undertaken to determine the persistence and efficacy of spinosad against Rhyzopertha dominica (F.) in wheat stored for 9 months at 30 degrees C and 55 and 70% relative humidity. The aim was to investigate the potential of spinosad for protecting wheat from R. dominica during long-term storage in warm climates. Wheat was treated with spinosad at 0.1, 0.5 and 1 mg kg(-1) grain and sampled after 0, 1.5, 3, 4.5, 6, 7.5 and 9 months of storage for bioassays and residue analyses. Residues were estimated to have declined by 30% during 9 months of storage at 30 degrees C and there was no effect of relative humidity. Spinosad applied at 0.5 or 1 mg kg(-1) was completely effective for 9 months, with 100% adult mortality after 14 days of exposure and no five F, adults produced. Adult mortality was < 100% in some samples of wheat treated with 0.1 mg kg(-1) of spinosad, and live progeny were produced in all samples treated at this level. The results show that spinosad is likely to be an effective grain protectant against R. dominica in wheat stored in warm climates.

Item Type:Article
Business groups:Agri-Science, Crop and Food Science
Additional Information:© Society of Chemical Industry.
Keywords:Spinosad; Rhyzopertha dominica; residue; efficacy; wheat stored-product insects; chlorpyrifos-methyl; grain protectant; biological efficacy; F. coleoptera; Australia; fenitrothion; Bostrichidae; degradation.
Subjects:Plant pests and diseases > Individual or types of plants or trees > Wheat
Plant pests and diseases > Pest control and treatment of diseases. Plant protection > Pesticides
Deposited On:21 Jan 2009 05:13
Last Modified:27 Oct 2011 01:00

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