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Pendimethalin Efficacy and Dissipation in Turfgrass as Influenced by Rainfall Incorporation

Published online by Cambridge University Press:  12 June 2017

John J. Gasper ,
John R. Street ,
S. Kent Harrison  and
William E. Pound
John J. Gasper
Affiliation:
Dep. Agron., The Ohio State Univ., Columbus, OH 43210
John R. Street
Affiliation:
Dep. Agron., The Ohio State Univ., Columbus, OH 43210
S. Kent Harrison
Affiliation:
Dep. Agron., The Ohio State Univ., Columbus, OH 43210
William E. Pound
Affiliation:
Dep. Agron., The Ohio State Univ., Columbus, OH 43210
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Abstract

A 2-yr field study was conducted to determine effects of posttreatment irrigation timing on pendimethalin efficacy and dissipation in turfgrass. Factors investigated included herbicide rate, formulation, and the interval between pendimethalin application and the initial posttreatment irrigation. Plots received an initial posttreatment irrigation of 1.25 cm 0, 7, 14, 21, and 28 d after treatment. Pendimethalin efficacy on smooth crabgrass was evaluated, and turfgrass foliage and the upper 2.5-cm layer of soil were periodically assayed for pendimethalin residues. Pendimethalin 1.71% granular provided better weed control than pendimethalin 60% wettable powder at all rates, irrigation events, and years. Efficacy of granular pendimethalin was not affected by a delay in posttreatment irrigation, whereas efficacy of pendimethalin in the wettable powder formulation was reduced when irrigation was applied later than the day of treatment. Chromatographic analyses indicated that an average of 54% of the applied pendimethalin (wettable powder formulation) was retained on turfgrass foliage immediately after treatment, compared to 9% for the granular formulation. Soil residue analyses confirmed that a greater proportion of applied pendimethalin reached the soil surface immediately after treatment in the granular formulation than in the wettable power formulation.

Keywords

Pendimethalin, N-(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenaminesmooth crabgrass, Digitaria ischaemum (L.) (Schreb. ex Schweig.) Schreb. ex Muhl. # DIGISDinitroanilinesposttreatment irrigationpreemergence herbicidesPoa pratensisDIGIS
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 42 , Issue 4 , December 1994 , pp. 586 - 592
Copyright
Copyright © 1994 by the Weed Science Society of America 

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