2012 Volume 40 Issue 2 Pages 130-136
Disease index and EC value and the mineral nutrient concentrations of dew on creeping bentgrass (Agrostis palustris Huds.) turf cvs. CY-2 and Penncross were investigated. As a result, the number of patches of the dollar spot disease at non fungicide treated plot were larger and the rate disease area of the brown patch were higher than fungicide treated plot. The patch numbers of the dollar spot disease in cv. Penncross were larger than the number of patches in cv. CY-2. EC value in dew adhering to the leaf surface of the non fungicide treated plot showed the tendency to be higher than EC value in the fungicide treated plot. EC value of cv. CY-2 tended to be lower than EC value of cv. Penncross. K, Ca, and Mg concentration in dew adhering to the turf surface of the non fungicide treated plot were all higher than the fungicide treated plot, and their concentration in dew from cv. Penncross were higher than the values of cv. CY-2. From these analysis results, concentration of K, Ca, and Mg leaching to adhering dew on the turf surface of the creeping bentgrass differ among cultivars. Moreover, it was suggested that the leaching increases in connection with the damage of stem and leaf by diseases occurrence.
