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Reproduction of phosphine resistant Rhyzopertha dominica (F.) following sublethal exposure to phosphine.

Ridley, A.W. and Schlipalius, D.I. and Daglish, G.J. (2012) Reproduction of phosphine resistant Rhyzopertha dominica (F.) following sublethal exposure to phosphine. Journal of Stored Products Research, 48 . pp. 106-110.

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Article Link(s): http://dx.doi.org/10.1016/j.jspr.2011.10.005

Publisher URL: http://www.elsevier.com

Abstract

Phosphine fumigation is commonly used to disinfest grain of insect pests. In fumigations which allow insect survival the question of whether sublethal exposure to phosphine affects reproduction is important for predicting population recovery and the spread of resistance. Two laboratory experiments addressed this question using strongly phosphine resistant lesser grain borer, Rhyzopertha dominica (F.). Offspring production was examined in individual females which had been allowed to mate before being fumigated for 48 h at 0.25 mg L -1. Surviving females produced offspring but at a reduced rate during a two-week period post fumigation compared to unfumigated controls. Cumulative fecundity of fumigated females from 4 weeks of oviposition post fumigation was 25% lower than the cumulative fecundity of unfumigated females. Mating potential post fumigation was examined when virgin adults (either or both sexes) were fumigated individually (48 h at 0.25 mg L -1) and the survivors were allowed to mate and reproduce in wheat. All mating combinations produced offspring but production in the first week post fumigation was significantly suppressed compared to the unfumigated controls. Offspring suppression was greatest when both sexes were exposed to phosphine followed by the pairing of fumigated females with unfumigated males and the least suppression was observed when males only were fumigated. Cumulative fecundity from 4 weeks oviposition post fumigation of fumigated females paired with fumigated males was 17% lower than the fecundity of unfumigated adult pairings. Both of these experiments confirmed that sublethal exposure to phosphine can reduce fecundity in R. dominica.

Item Type:Article
Business groups:Agri-Science
Additional Information:© Crown Copyright 2011
Keywords:Chemical control; fecundity; fumigation; insect pests; insecticide resistance; insecticides; oviposition; pest control; phosphine; stored products pests; survival; insects; Rhyzopertha dominica; pest insects; storage pests; stored-product pests; arthropods; invertebrates.
Subjects:Science > Zoology > Invertebrates > Insects
Plant pests and diseases > Economic entomology
Plant culture > Field crops
Deposited On:04 Jun 2012 04:29
Last Modified:04 Jun 2012 04:29

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