John C. Inguagiato, James A. Murphy, and Bruce B. Clarke. Rutgers University, Dept. of Plant Biology & Pathology, New Brunswick, NJ 08901
Annual bluegrass (Poa annua) putting green turf can be extensively damaged by anthracnose disease. The objective of this field study was to evaluate anthracnose severity and ball roll distance in response to putting green mowing and rolling practices during 2004 and 2005. Treatments were arranged in a factorial combination using a split-split plot design with four replications. Mowing height (2.8-, 3.2-, and 3.6-mm) was the main plot, mowing frequency (7 times wk-1 or 14 times wk-1) was the subplot, and lightweight vibratory rolling (rolling vs. no rolling) was the sub-subplot. Symptoms from a naturally occurring outbreak of anthracnose were apparent by 29 July 2004. Disease severity was greatest at the 2.8-mm mowing height, while plots mowed at 3.6-mm incurred the lowest levels of disease in both 2004 and 2005. A significant interaction between mowing height and frequency on three rating dates in 2004 indicated no difference in anthracnose observed between mowing at 2.8- and 3.2-mm height at 7 times wk-1 while 2.8-mm mowing had more disease than 3.2-mm at 14 times wk-1 mowing frequency. Increased mowing frequency at 3.2- or 3.6-mm either reduced or had no effect on disease severity in 2004; whereas under 2.8-mm mowing, 14 times wk-1 increased disease compared to 7 times wk-1. Mowing frequency did not effect disease development in 2005. Ball roll distance was affected by the main effects in both years; interactions were not significant. All combinations of mowing frequency and rolling at the low and moderate mowing heights (2.8 and 3.2 mm) achieved the minimum acceptable distance established for this study (i.e., 2.9 to 3.2 m). Therefore, the cultural practices of double cutting and rolling at a 3.6 mm (highest) height of cut produced acceptable ball roll distances and reduced anthracnose severity.
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