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Residual toxicities and persistence of organophosphorus insecticides mixed with carbaryl as structural treatments against three liposcelidid psocid species (Psocoptera: Liposcelididae) infesting stored grain

Nayak, M. K. and Collins, P. J. and Kopittke, R. A. (2003) Residual toxicities and persistence of organophosphorus insecticides mixed with carbaryl as structural treatments against three liposcelidid psocid species (Psocoptera: Liposcelididae) infesting stored grain. Journal of Stored Products Research, 39 (4). pp. 343-353.

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Article Link(s): http://dx.doi.org/10.1016/S0022-474X(02)00029-2

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

Abstract

Four organophosphorus insecticides, azamethiphos, fenitrothion, chlorpyrifos-methyl, and pirimiphos-methyl were each mixed with carbaryl and evaluated as structural treatments on concrete and galvanized steel panels (0.3×0.3 m) against adults of three liposcelidid psocids: Liposcelis bostrychophila Badonnel, L. entomophila (Enderlein), and L. paeta Pearman. Residual toxicities and persistence of these insecticide mixtures were assessed at 30±1°C, 70±2% r.h., and a photoperiod of 12:12(L:D) h from 1 day after treatment (0 week) and at weeks 1, 2, 4, 6, and 8, and then every 4 weeks up to week 40. Mortality was recorded at exposure periods of 6 h and then every 24 h until end-point was achieved. Significant enhancement in residual toxicities was observed in azamethiphos plus carbaryl against L. entomophila, and chlorpyrifos-methyl plus carbaryl and pirimiphos-methyl plus carbaryl against all three species on steel surfaces, compared with the individual effectiveness of these insecticides reported earlier. We conclude that combining carbaryl with either azamethiphos, chlorpyrifos-methyl, or pirimiphos-methyl as a structural treatment will provide long-term protection (up to 40 weeks) against infestation by all three psocid species on steel storage structures, whilst carbaryl with fenitrothion will give shorter protection (up to 8 weeks). On concrete structures, however, only azamethiphos plus carbaryl will provide long-term protection against L. bostrychophila (up to 28 weeks) and L. paeta (up to 16 weeks). None of the four insecticide mixtures studied would provide long-term protection against an L. entomophila infestation on concrete surfaces.

Item Type:Article
Business groups:Agri-Science, Crop and Food Science
Additional Information:© Elsevier Science Ltd.
Keywords:Liposcelis bostrychophila; Liposcelis entomophila; Liposcelis paeta; organophosphorus insecticides; carbaryl; residual toxicity.
Subjects:Science > Zoology > Invertebrates > Insects
Plant pests and diseases > Individual or types of plants or trees
Plant culture > Field crops > Grain. Cereals
Plant culture > Harvesting, curing, storage
Plant pests and diseases > Pest control and treatment of diseases. Plant protection > Pesticides
Deposited On:09 Dec 2003
Last Modified:25 Oct 2011 06:15

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