Golf Course Management

JUL 2013

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research bermudagrass vigor and subsequent recovery from spring dead spot symptoms. Pre-emergence herbicide selection may be important when the site has a history of spring dead spot disease pressure. Ronstar can be safely used as a pre-emergence option when bermudagrass is recovering from spring dead spot, while the use of Surfan, Barricade, Dimension, Tower, Pendulum and Specticle may limit recovery and further weaken the turfgrass system. Acknowledgments The authors wish to extend appreciation to Paul Dominguez, GCSAA Class A superintendent at Hillcrest Country Club and a 20-year member of the association, for the use of his facility. This research was previously published in the online journal Applied Turfgrass Science as "Effect of pre-emergence herbicides on the recovery of bermudagrass from spring dead spot" by L.L. Beck, T. Cooper, A.J. Hephner, C.M. Straw and G.M. Henry. 2013. doi:10.1094/ATS-2013-0328-01-RS. Literature cited 1. Baird, J.H., D.L. Martin, C.M. Taliaferro et al. 1998. Bermudagrass resistance to spring dead spot caused by Ophiosphaerella herpotricha. Plant Disease 82:771-774. 2. Brosnan, J.T., G.K. Breeden, A.W. Thoms and J.C. Sorochan 2011. Preemergence herbicide effcacy under athletic feld traffc. Online. Applied Turfgrass Science doi:10.1094/ATS2011-1128-01-BR. 3. Brosnan, J.T., G.K. Breeden, P.E. McCullough and G.M. Henry. 2012. PRE and POST control of annual bluegrass (Poa annua) with indazifam. Weed Technology 26:48-53. 4. Capo-chichi, L.J.A., J.M. Goatley Jr., W. Philley et al. 2005. Dinitroaniline-induced genetic changes in bermudagrass. Crop Science 45:1504-1510. 5. Cooper, T., and G.M. Henry.2010. Bermudagrass divot recovery in response to dinitroaniline preemergence herbicides. Proceedings Southern Weed Science Society 63:57. (Abstract) Online. www.swss.ws/NewWebDesign/Proceedings/Archives/ 2010%20Proceedings-SWSS.pdf (verifed June 10, 2013). 6. Dawson, B. 2011. A drought for the centuries: It hasn't been this dry in Texas since 1789. Texas Climate News, Dec. 19, 2011. 7. Dernoeden, P.H., J.N. Crahay and D.B. Davis. 1991. Spring dead spot and bermudagrass quality as infuenced by nitrogen source and potassium. Crop Science 31:1674-1680. 8. Fagerness, M.J., F.H. Yelverton and R.J. Cooper. 2002. Bermudagrass [Cynodon dactylon (L.) Pers.] and zoysiagrass (Zoysia japonica) establishment after preemergence herbicide applications. Weed Technology 16:597-602. 9. Fishel, F.M., and G.E. Coats. 1993. Effect of commonly used turfgrass herbicides on bermudagrass (Cynodon dactylon) root growth. Weed Science 41:641-647. 10. Fishel, F.M., and G.E. Coats. 1994. Bermudagrass (Cynodon dactylon) sod rooting as infuenced by preemergence herbicides. Weed Technology 8:46-49. 11. Henry, G.M., J.T. Brosnan, G.K. Breeden et al. 2012. Indazifam programs for weed control in overseeded bermudagrass turf. HortTechnology 22:774-777. 12. Jones, P.A., J.T. Brosnan, D.A. Kopsell and G.K. Breeden. 2012. Soil type and rooting depth affect hybrid bermudagrass injury with preemergence herbicides. Crop Science 53:660-665. 13. Mitra, S., and P.C. Bhowmik. 2005. Root pruning preemergence herbicides affect root development of Kentucky bluegrass (Poa pratensis L.). International Turfgrass Society Research Journal 10:1227-1232. 14. Nus, J.L., and K.Shashikumar. 1993. Fungi associated with spring dead spot reduce freezing resistance in bermudagrass. HortScience 28:306-307. 15. Parka, S.J., and O.F. Soper. 1967. The physiology and mode of action of the dinitroaniline herbicides. Weed Science 25:79-87. 16. Perry, D.H., M. Tomaso-Peterson and R. Baird. 2010. Seasonal variation in frequency of isolation of Ophiosphaerella korrae from bermudagrass roots in Mississippi and pathogenicity and optimal growth of selected isolates. Mycopathologia 169:395-402. 17. Post, A.R., and S.D. Askew. 2011. Effects of indazifam on bermudagrass [Cynodon dactylon (L.) Pers.] quality and root strength. Proceedings Southern Weed Science Society 64:97 (Abstract). Online. www.swss.ws/NewWebDesign/ Proceedings/Archives/2011%20Proceedings-SWSS.pdf (verifed June 10, 2013). 18. Tredway, L.P., M. Tomaso-Peterson, H. Perry and N.R. Walker. 2008. Spring dead spot of bermudagrass: A challenge for researchers and turfgrass managers. Online. APSnet Features. doi:10.1094/APSnetFeature-2008-0108. 19. Turgeon, A.J. 2011. Turfgrass Management. 9th ed. Prentice Hall, Upper Saddle River, N.J. 20. Wadsworth, D.F., and H.C. Young. 1960. Spring dead spot of bermudagrass. Plant Disease 44:516-518. 21. Walker, N.R. 2009. Infuence of fungicide application timings on the management of bermudagrass spring dead spot caused by Ophiosphaerella herpotricha. Plant Disease 93:1341-1345. 22. Yelverton, F. 1995. Strategies for turfgrass weed control with preemergence herbicides. North Carolina State University, Raleigh, N.C. Online. www.turffles.ncsu.edu/articles/ tf0071.aspx (verifed June 10, 2013). GCM L.L. Beck is an instructor in the department of plant and soil science, Texas Tech University, Lubbock, Texas; T. Cooper is a sales representative for Dow AgroSciences, Houston; A.J. Hephner is a turf and ornamental market specialist for FMC, Knightdale, N.C.; C.M. Straw is a graduate research assistant and G.M. Henry (gmhenry@uga.edu) is an associate professor in the department of crop and soil sciences, University of Georgia, Athens, Ga. V v v The research says ➔ Field experiments examined the recovery of a bermudagrass fairway from SDS following pre-emergence herbicide applications. ➔ Recovery from spring dead spot in the non-treated check plots on a bermudagrass fairway in Texas in 2011 (46%) and 2012 (59%) was similar to bermudagrass recovery in response to Ronstar at 3.03 pounds/ acre (2011, 55%; 2012, 57%) at 14 weeks after treatment. ➔ Bermudagrass exhibited the least amount of recovery (13% to 14%) in response to Specticle at 0.031 pound/acre, regardless of year. ➔ Ronstar can be safely used as a pre-emergence option when bermudagrass is recovering from spring dead spot. ➔ Using Surflan, Barricade, Dimension, Tower, Pendulum and Specticle may limit recovery and further weaken the turfgrass system. July 2013 GCM 85

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