Dimethoate, fenvalerate and their mixture affects Hylyphantes graminicola (Araneae: Linyphiidae) adults and their unexposed offspring | Macquarie University ResearchOnline

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Dimethoate, fenvalerate and their mixture affects Hylyphantes graminicola (Araneae: Linyphiidae) adults and their unexposed offspring

Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.14/119247

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Title: Dimethoate, fenvalerate and their mixture affects Hylyphantes graminicola (Araneae: Linyphiidae) adults and their unexposed offspring
Related: Agricultural and forest entomology, Vol. 12, No. 4 (2010), p.343-351
DOI: 10.1111/j.1461-9563.2010.00481.x
Publisher: Wiley-Blackwell
Date: 2010
FoR/RFCD Code(s): 070000 Agricultural And Veterinary Sciences 050204 Environmental Impact Assessment 060808 Invertebrate Biology
Author/Creator: Peng, Yu
Author/Creator: Shao, Xiao-li
Author/Creator: Hose, Grant C
Author/Creator: Liu, Feng-xiang
Author/Creator: Chen, Jian
Description: 1. Mixtures of organophosphorus and pyrethroid insecticides are widely used to combat resistance in agricultural pests, although few studies have been conducted on the effects of pesticide mixtures on beneficial nontarget organisms. 2. In the present study, we exposed adult females (F₀) of Hylyphantes graminicola (Araneae: Linyphiidae) to fenvalerate, dimethoate and their commercially available 1 : 1 mixture (by mass). We investigated the acute toxicity of these pesticides to the exposed adults, as well as sublethal effects on reproduction and acetylcholinesterase and carboxylesterase activity. We also studied the effects of parental exposure on the size, development and enzyme activity of unexposed offspring. 3. All three formulations were acutely toxic to H. graminicola, with synergism between dimethoate and fenvalerate leading to greater toxicity in the 1 : 1 mixture than for the two insecticides alone. The sublethal effects of direct pesticide exposure were a reduction in acetylcholinesterase and carboxylesterase activity and a reduction in the number of egg sacs produced by exposed spiders relative to the control spiders. The unexposed offspring of the fenvalerate and mixture exposed spiders were smaller and took longer to mature than the control spiders. Offspring of all exposed spiders also had significantly reduced carboxylesterase activity relative to control spiders. 4. We concluded that the effects of parental exposure on the offspring were likely to increase their susceptibility to future pesticide exposures, and reduce the capacity of this spider to serve as a pest control agent.
Description: 9 page(s)
Subject Keyword: 070000 Agricultural And Veterinary Sciences
Subject Keyword: 050204 Environmental Impact Assessment
Subject Keyword: 060808 Invertebrate Biology
Subject Keyword: acetylcholinesterase
Subject Keyword: carboxylesterase
Subject Keyword: dimethoate
Subject Keyword: fenvalerate
Subject Keyword: Hylyphantes graminicola
Subject Keyword: insecticides mixture
Subject Keyword: sublethal effects
Resource Type: journal article
Organisation: Macquarie University. Dept. of Environment and Geography
Organisation: Macquarie University. Dept. of Biological Sciences

Identifier: http://hdl.handle.net/1959.14/119247
Identifier: ISSN:1461-9555
Identifier: mq-rm-2010003595
Language: eng
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