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LI Landscape and Turf MainTenance www.landscapeirrigation.com Landscape and Irrigation March 2015 43 Active Ingredient Trade Name† Formulations‡,¶ Labeled Species prodiamine Barricade FL, WG Bermudagrass Seashore Paspalum Tall Fescue Kentucky Bluegrass Perennial Ryegrass dithiopyr Dimension EW, WP Bermudagrass Seashore Paspalum Tall Fescue Kentucky Bluegrass Perennial Ryegrass prodiamine + sulfentrazone Echelon SC Bermudagrass Seashore Paspalum Tall Fescue Kentucky Bluegrass Perennial Ryegrass pendimethalin Pendulum FL, G, EC Bermudagrass Seashore Paspalum Tall Fescue Kentucky Bluegrass Perennial Ryegrass pendimethalin + dimethenamid-P FreeHand G Bermudagrass Seashore Paspalum oxadiazon Ronstar G, FL, WSP Dormant Bermudagrass (FL, WSP only) Bermudagrass (G only) Seashore Paspalum (G only) Tall Fescue (G only) Kentucky Bluegrass (G only) Perennial Ryegrass (G only) indaziflam Specticle WSP, FL, G Bermudagrass † Active ingredients may be available under multiple trade names. Mention of trade names or commercial products in this publication is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the University of Ten- nessee Institute of Agriculture. The omission of a particular trade name is not intended to reflect adversely, or to show bias against, any product or trade name not mentioned. ‡ FL = flowable; WG = water dispersible granular; EW = concentrated emulsion; WP = wettable powder; WSP = water soluble powder; SC = soluble concentrate; G = granular (not on fertilizer). ¶ Many preemergence herbicides are sold on granular fertilizer carriers. Be sure to follow label instructions to ensure that the correct rates of active ingredient and nutrients are supplied to turf when using these materials. Table 1. List of herbicide active ingredients labeled for preemergence (PRE) control of annual grassy weeds in warm- and cool-season turf- grasses. mer, often leading to crabgrass breakthrough by fall. Split applica- tion programs delivering active ingredient two times throughout a season tend to provide a longer period of control. Additionally, split application programs will control species germinating later in the year than crabgrass (e.g., goosegrass, etc.). ConCLusIons Numerous PRE herbicides are available for controlling annual grassy weeds. Always refer to the product label for specific infor- mation on proper use, tank-mixing compatibility and turfgrass tolerance. Mention of trade names or commercial products in this publication is solely for the purpose of providing specific in- formation and does not imply recommendation or endorsement by the University of Tennessee Institute of Agriculture. For more information on turfgrass weed control, visit the University of Tennessee's turfgrass weed science website at www.tennesseeturf grassweeds.org. James T. Brosnan is associate professor and co-director of the Center for Athletic Field Safety; Gregory K. Breeden is extension specialist; John C. Sorochan is associate professor and co-director of the Center for Athletic Field Safety; and Adam W. Thoms is research leader, Center for Athletic Field Safety — all at the University of Tennessee in Knoxville.