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role of cuticular waxes and surface roughness in determining the insecticidal efficacy of deltamethrin and dimethoate applied as emulsifiable concentrates to leaf surfaces

Chowdhury, A.B.M.N.U ; Jepson, P.C ; Ford, M.G ; Frampton, G.K

International journal of pest management, 2005-10, Vol.51 (4), p.253-263 [Periódico revisado por pares]

London: Taylor & Francis

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Título:
role of cuticular waxes and surface roughness in determining the insecticidal efficacy of deltamethrin and dimethoate applied as emulsifiable concentrates to leaf surfaces
Autor: Chowdhury, A.B.M.N.U ; Jepson, P.C ; Ford, M.G ; Frampton, G.K
Assuntos: Arthropoda ; bioavailability ; Biological and medical sciences ; Candida ; Collembola ; Control ; crops ; deltamethrin ; dimethoate ; emulsifiable concentrates ; epicuticular wax ; foliar application ; Folsomia candida ; Fundamental and applied biological sciences. Psychology ; Isotomidae ; leaves ; nontarget organisms ; pesticide formulations ; Phytopathology. Animal pests. Plant and forest protection ; Protozoa. Invertebrates ; surface roughness ; toxicity ; wax content
É parte de: International journal of pest management, 2005-10, Vol.51 (4), p.253-263
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: Previous work has shown that insecticide residual toxicity to arthropods on foliage varies strongly with leaf type. Although several aspects of leaf morphology could influence insecticide toxicity, the possible role of leaf waxes, which could influence bioavailability, has not previously been investigated. In this study, the influence of leaf wax cover on the residual toxicity of deltamethrin and dimethoate was investigated using the standard test arthropod Folsomia candida Willem (Collembola: Isotomidae) as a surrogate for soft-bodied leaf-dwelling insects. Sixteen leaf types were studied, representing a wide range of crop species. Deltamethrin efficacy increased with increasing leaf surface wax cover. No such relationship was observed, however, for the more polar insecticide dimethoate. Leaf surface roughness was examined using atomic force microscopy and was also observed to influence the efficacy of deltamethrin. The increased efficacy of deltamethrin may be attributed in part to the acquisition of insecticide-contaminated wax particles by F. candida walking over treated leaf surfaces. We provide a regression equation to describe the relationship between wax content, surface roughness and the response of F. candida to deltamethrin-treated leaf surfaces. We discuss the implications of our findings for the risk assessment of pesticides in IPM, in particular concerning the choice of leaf substrates for use in toxicity screening tests with natural enemies.
Editor: London: Taylor & Francis
Idioma: Inglês

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role of cuticular waxes and surface roughness in determining the insecticidal efficacy of deltamethrin and dimethoate applied as emulsifiable concentrates to leaf surfaces

Chowdhury, A.B.M.N.U ; Jepson, P.C ; Ford, M.G ; Frampton, G.K

London: Taylor & Francis

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