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1 July 2011 Aminocyclopyrachlor Enhances Fenoxaprop Efficacy for Smooth Crabgrass Control
Patrick E. McCullough, Stephen E. Hart, James T. Brosnan, Gregory K. Breeden
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Fenoxaprop effectively controls crabgrass in tall fescue turf, but antagonism with growth-regulating herbicides reduces potential to apply fenoxaprop in combination with many herbicides registered for broadleaf weed control. Aminocyclopyrachlor is a new broadleaf weed control herbicide that has not been evaluated in combination with fenoxaprop. Field experiments were conducted in Georgia, New Jersey, and Tennessee to investigate tank mixtures of fenoxaprop with aminocyclopyrachlor for smooth crabgrass and white clover control. Fenoxaprop alone exhibited substantial activity on smooth crabgrass but control was greater with fenoxaprop aminocyclopyrachlor treatments. By 4 and 6 wk after treatment (WAT), approximately 22 and 44% less fenoxaprop was required to achieve 80% smooth crabgrass control when the herbicide was tank-mixed with aminocyclopyrachlor at 52.5 and 79 g ai ha−1, respectively. Fenoxaprop did not reduce white clover control with aminocyclopyrachlor because 97% control was achieved by 4 WAT for all aminocyclopyrachlor fenoxaprop treatments. Tall fescue was not injured by any treatment. Results suggest aminocyclopyrachlor enhances fenoxaprop efficacy for smooth crabgrass control in tall fescue.

Nomenclature: Smooth crabgrass, Digitaria ischaemum [Schreb] Schreb. ex Muhl.; tall fescue, Festuca arundinacea Schreb.; white clover, Trifolium repens L.

Weed Science Society of America
Patrick E. McCullough, Stephen E. Hart, James T. Brosnan, and Gregory K. Breeden "Aminocyclopyrachlor Enhances Fenoxaprop Efficacy for Smooth Crabgrass Control," Weed Technology 25(3), 506-510, (1 July 2011).
Received: 16 November 2010; Accepted: 18 February 2011; Published: 1 July 2011

weed control
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