Agronomy Journal (2006) 98, 141-147

Timothy L. Grey, G. David Buntin, Phillip M. Roberts and David C. Bridges (2006)
Potential interaction of pendimethalin and systemic insecticides for thrips control in cotton
Agronomy Journal 98 (1), 141-147
Abstract: Pendimethalin (N-(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenamine) can be preemergence (PRE) applied to cotton (Gossypium hirsutum L.) up to 2 d after planting (DAP). Delayed application in combination with excessive moisture (rainfall or irrigation) can result in seedling injury. The systemic insecticides aldicarb [(2-methyl-2-(methylthio)propanal O-[(methylamino)carbonyl]oxime] and imidacloprid [(EZ)-1-(6-chloro-3-pyridylmethyl)-N-nitroimidazolidin-2-ylideneamine] are used at planting for thrips (Frankliniella fusca Hinds) control. Experiments were conducted in Georgia to determine if pendimethalin injury to cotton would reduce insecticide efficacy and thus lead to increased thrips injury and subsequent reduced cotton growth or delayed maturity. Treatments included three insecticide treatments; none, imidacloprid at 0.044 kg ha^-1 a.i., and aldicarb 15G at 0.8 kg ha^-1 a.i., in combination with five herbicide applications; none and pendimethalin at 1.1 and 2.2 kg ha^-1 a.i. applied either PRE or 2 DAP. Variables measured included thrips infestation, stand count, leaf area, root length, stem length, dry weights, nodes above white flower, first position boll retention, and seed cotton yield. Results indicate significant differences in early season cotton growth relative to herbicidal injury and lack of insecticidal thrips control. However, there was no significant insecticide x herbicide interactions, indicating no apparent loss of insecticide efficacy after pendimethalin injury.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Timothy L. Grey

Research topic(s) for pests/diseases/weeds:
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Frankliniella fusca	Cotton (Gossypium)	U.S.A. (SE)