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Effect of early season insecticide use on predators and outbreaks of spider mites (Acari: Tetranychidae) in cotton

Published online by Cambridge University Press:  10 July 2009

L.J. Wilson ,
L.R. Bauer  and
D.A. Lally
L.J. Wilson*
Affiliation:
CSIRO Division of Plant Industry, Cotton Research Unit, Locked Bag 59, Narrabri, New South Wales, Australia, 2390
L.R. Bauer
Affiliation:
CSIRO Division of Plant Industry, Cotton Research Unit, Locked Bag 59, Narrabri, New South Wales, Australia, 2390
D.A. Lally
Affiliation:
CSIRO Division of Plant Industry, Cotton Research Unit, Locked Bag 59, Narrabri, New South Wales, Australia, 2390
*
* Fax: (067) 991503 E-mail: [email protected]
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Abstract

The Australian cotton industry relies almost exclusively on synthetic insecticides for control of early season pests. These insecticides often disrupt predatory insect activity in the field. Potential predators of the twospotted spider mite, Tetranychus urticae Koch, in cotton, identified in field and confirmed in laboratory experiments, included a theridiid spider, a phytoseiid mite, a lacewing larva, predatory thrips, several Coccinellidae and several Hemiptera. These predators were mostly generalists, having previously been reported as predators of aphids or caterpillars of Helicoverpa spp. The effect of insecticides on T. urticae and its predators was evaluated in three field experiments. Cotton was artificially infested with T. urticae then sprayed five times at seven to ten day intervals with either dimethoate (140 g ai/ha), thiodicarb (750 g ai/ha and 187.5 g ai/ha), endosulfan (735 g ai/ha and 367.5 g ai/ha), methomyl (169 g ai/ha) or amitraz (400 g ai/ha). Tetranychus urticae populations reached higher densities in dimethoate, thiodicarb and methomyl treated cotton than in untreated cotton. Population densities of T. urticae in cotton treated with low rates of endosulfan or thiodicarb were similar to controls, while those in cotton treated with amitraz were lower. All insecticides caused significant reductions in at least one predator group. Significant negative relationships were found between early season abundance of predators and the mid-season abundance of T. urticae and positive relationships between predators and the lag-period for T. urticae outbreaks to develop. Predation is implicated as a key factor influencing the early season survival of T. urticae. The implications for developing integrated pest management strategies in cotton are discussed.

Type
Research Article
Information
Bulletin of Entomological Research , Volume 88 , Issue 4 , August 1998 , pp. 477 - 488
Copyright
Copyright © Cambridge University Press 1998

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