SportsTurf March 2011

SportsTurf provides current, practical and technical content on issues relevant to sports turf managers, including facilities managers. Most readers are athletic field managers from the professional level through parks and recreation, universities.

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FieldScience | ByJ.T. Brosnan and G.K. Breeden New herbicides for 2011 individuals managing cool- and warm-sea- son athletic fields. Some of the new herbi- cides that will be available in 2011 are outlined below. Specticle (active ingredient- indazi- A flam) is a new preemergence herbicide from Bayer Environmental Science labeled for use on warm-season turf at rates of 2.5 to 5 oz/A. Research at the University of Ten- nessee has found that Specticle provides ef- fective preemergence control of crabgrass (Digitaria spp.) and annual bluegrass (Poa annua) at lower use rates than other pre- emergence herbicides. This herbicide is also labeled preemergence control of goosegrass (Eleusine indica). Individuals should use caution when ap- plying Specticle to athletic field turf. This herbicide has a longer residual than other preemergence herbicides; thus, there are label restrictions pertaining to not only overseeding but establishing new warm-sea- son turfgrass from stolons/sprigs or sod. Depending on application rate, turfgrass managers cannot overseed for 8 to 12 months after treatment with Specticle. Fur- thermore, the product label currently states that turfgrass managers must delay sprig- ging or sodding for 2 and 4 months after application, respectively. Imprelis (active ingredient- aminocy- clopyrachlor) is a new postemergence her- bicide from DuPont labeled for broadleaf weed control in cool-season turfgrasses, as well as zoysiagrass (Zoysia japonica) and cen- tipedegrass (Eremochloaophiuroides). Appli- cation rates for cool-season turfgrass range from 3 to 4.5 floz/A. On warm-season turf- grass, application rates cannot exceed 3 floz/A, mowing heights must be greater than ½ inch, and some temporary turfgrass in- jury must be tolerated. Similar to Specticle, this herbicide will provide effective weed control at a lower application rate than has been used with similar chemistries (i.e., mix- 10 SportsTurf | March 2011 S THE CALENDAR TURNS each year, new her- bicides are introduced into the marketplace. Many of these herbicides may benefit tures of 2,4-D + MCPP + dicamba). Im- prelis is labeled for use on golf courses, ath- letic fields, sod farms, as well as residential and commercial turf. In research trials conducted at the Uni- versity of Tennessee, seedling tall fescue and perennial ryegrass have shown tolerance to Imprelis applications for weed control. Ap- plications of Imprelis at labeled rates have not affected perennial ryegrass or tall fescue establishment. Similarly, application of Im- prelis at labeled rates 1 to 2 weeks after seeding has not been injurious either. Many athletic field managers may benefit from these attributes. Other commonly used broadleaf weed control herbicides (e.g., mixtures of 2,4-D + MCPP + dicamba) re- quire individuals to delay seeding for 3 to 4 weeks after application and restrict applica- tions to newly seeded stands until the sec- ond or third mowing. Additionally, research conducted at the University of Tennessee has demonstrated that Imprelis can be tank-mixed with Ac- claim Extra (from Bayer—active ingredient is fenoxaprop) to provide cool-season turf- grass managers with an option for poste- mergence broadleaf weed and smooth crabgrass control. SquareOne (active ingredients- carfen- trazone + quinclorac) is a new postemer- gence herbicide mixture from FMC labeled for control of certain grassy and broadleaf weeds in warm- and cool-season turfgrass as soon as 7 to 14 days after seeding. Square- One is labeled for use on golf courses, ath- letic fields, sod farms, as well as residential and commercial turf. Application rates of SquareOne range from 8 to 18 oz/A. Celsius (active ingredients- thiencar- bazone + iodosulfuron + dicamba) is a new postemergence herbicide mixture from Bayer labeled for use on select warm-season turfgrasses at rates of 2.5 to 4.9 oz/A; how- ever, turfgrass managers cannot exceed 7.4 oz/A in a single year. Celsius is not labeled for use on seashore paspalum (Paspalum vaginatum); thus, turfgrass managers with seashore paspalum athletic fields (or bermudagrass fields heavily infested with seashore paspalum) should select an alterna- tive herbicide for broadleaf weed control. Celsius is labeled for the control of a wide range of broadleaf and grassy weeds. Prelimi- nary research at the University of Tennessee and the University of Georgia has also ob- served postemergence activity on dallisgrass (Paspalum dilatatum) following applications of Celsius in mixtures with Revolver (active ingredient foramsulfuron); however, it is not clear at this time whether these treatments will provide effective, long-term control. Blindside (active ingredients- sulfen- trazone + metsulfuron) is a postemergence herbicide mixture FMC labeled for broadleaf weed control on certain cool- and warm-season turfgrasses at rates of 3.25 to 10 oz/A. Avoid applying Blindside to any cool-season turfgrasses under stress, as tem- porary injury can occur after application. Blindside is labeled for use on golf courses, athletic fields, sod farms, as well as residential and commercial turf. Research at the University of Tennessee has reported that applications of Blindside can increase the speed of ground ivy (Glechoma heder- acea) and Virginia buttonweed (Diodia vir- giniana) control compared to Manor (active ingredient metsulfuron) alone. Many of these herbicides will provide athletic field managers with new options for broadleaf and grassy weed control in 2011. Always refer to the product label for specific information 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 information and does not imply recommendation or en- dorsement by the University of Tennessee Institute of Agriculture. For more informa- tion on turfgrass weed control, visit the University of Tennessee’s turfgrass weed sci- ence web site at www.tennesseeturfgrass- ■ Dr. Jim Brosnan is assistant professor-turf- grass weed science and Greg Breeden is weed science extension assistant at the University of Tennessee.

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