Golf Course Management

MAY 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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05.18 GOLF COURSE MANAGEMENT 67 tions is obvious (Figure 2). e hyphae them- selves are hyaline and are binucleate. In our experience, the fungus sometimes readily grows out of leaf tissue after 24 hours, but at other times, it is slow to produce the diagnos - tic hyphal aggregates. Conditions favoring disease e fungus is able to grow at a wide range of temperatures. Growth of the fungus has been observed from 40 F to 90 F (4 C-32 C), but optimal growth in culture is between 68 F and 77 F (8 C-20 C) (3). at being said, it seems that the biotype observed on ultradwarf bermudagrass grows best at the lower tem - perature range. In particular, cream leaf blight is most severe on bermudagrass that has been covered during the winter months. is fits with the description of the fungus, as it typi - cally is most severe when turf is slow-growing, because it is a slow-growing fungus. Although the disease is most prevalent during winter, we have observed it in summer during extended periods of rain and cloud cover. Management Management of cream leaf blight has been relatively simple. Fungicides work well, and a few have been exceptional in our experience. Cream leaf blight did not develop in any of our fungicide trials until 2016, so before then we relied on feedback from superintendents on what was working. A number of people reported that iprodione worked well cura - tively. Curative applications are made after significant stand symptoms are present. Many superintendents said that Prostar (flutalonil, Bayer) was also excellent. One superintendent Hyphal aggregates Figure 2. The fungus Limonomyces roseipellis produces hyphal aggregates after incubation of bermudagrass samples. The hyphal aggregates are visible only with a dissecting microscope.

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