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Cotton

Potential Interaction of Pendimethalin and Systemic Insecticides for Thrips Control in Cotton

^a Univ. of Georgia, College of Agric. and Environ. Sci., P.O. Box 748, Tifton, GA 31794
^b Univ. of Georgia, College of Agric. and Envrion. Sci., 1109 Experiment St., Griffin, GA 30223

^* Corresponding author (tgrey{at}uga.edu)

Received for publication May 16, 2005. 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.

Abbreviations: DAP, days after planting • 2 DAP, 2 days after planting preemergence • NAWF, nodes above white flower • PRE, preemergence