Golf Course Management

AUG 2018

Golf Course Management magazine is dedicated to advancing the golf course superintendent profession and helping GCSAA members achieve career success.

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08.18 GOLF COURSE MANAGEMENT 69 reduced compared to the check (Figure 5.) Currently, field symptoms of ink spot have been observed only on bermudagrass and zoy - siagrass, with the latter appearing more sus- ceptible in the southern United States. Golf course superintendents have had success managing ink spot with fungicides labeled for Curvularia species. However, ef - ficacy trials that include the new generation of succinate dehydrogenase inhibitor (SDHI) fungicides as well as fertility studies such as nitrogen source and rates may benefit superin - tendents who are trying to reduce outbreaks of ink spot caused by C. malina. Funding is research is a contribution of the Mis- sissippi Agricultural and Forestry Experiment Station and the National Institute of Food and Agriculture, U.S. Department of Agricul - ture, Hatch project under accession number 213130. Acknowledgments We are grateful to all the golf course super- intendents in Houston who provided turfgrass samples for the diagnosis and characterization of ink spot and Curvularia malina. Literature cited 1. Tani, T., and J.B. Beard. 1997. Color Atlas of Turfgrass Diseases. 1st edition. Ann Arbor Press, Chelsea, Mich. 2. Tomaso-Peterson, M., J. Young-Ki, P.L. Vines and F.G. Hoffman. 2016. Curvularia malina sp. nov. incites a new disease of warm-season turfgrasses in the south - eastern United States. Mycologia 108(5):915-924. 3. Woods. M. 2016. Dog's footprint and turfgrass susceptibility to this disease. Viridescent: The Asian Turfgrass Center Blog. Sept. 19, 2016. http://www. blog.asianturfgrass.com/2016/09/dogs-footprint- and-grass-susceptibility-to-this-disease.html. Maria Tomaso-Peterson (mariat@pss.msstate.edu) is a research professor in plant pathology at Mississippi State University in Mississippi State, Miss. RESEARCH SAYS • A disease of warm-season grasses was discovered in the Houston area in the late 2000s. • Because the primary disease symptom was dark brown-to-black patches in the turf and black foliar lesions, the disease was called "ink spot." • Phylogenetic analysis was used to identify the fungal pathogen for ink spot, which was considered a novel pathogen and named Curvularia malina. • Ink spot has been found only in the 30th parallel north. • Further research is needed to determine which management practices or products will reduce or control disease occurrence. Figure 5. Pathogenicity of Curvularia malina to warm-season turfgrass species. Top, Zoysiagrass; Center, centipedegrass; and Bottom, seashore paspalum. All three photos show seedlings in C. malina-infested (left) and non-infested (right) potting mix at 5 weeks after planting. In all three cases, seedling density was reduced in the C. malina-infested potting soil.

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