Initial moss counts were performed on the day of the first treatment or, just prior to treatment. A 0.5 x 0.5 m grid was placed over each plot and % moss was estimated in each of the 25 (10 x 10 cm) quadrats. Percent moss was evaluated roughly every two weeks during the treatment period and once in the spring of 2004. Plots were rated on Oct. 24, 2003, Oct. 31, 2003, Nov. 7, 2003 and April 11, 2004.The initial moss infestation on the research greens at the Guelph Turfgrass Institute in 2004 were slightly higher than the Deer Ridge Golf Club in 2003, ranging from 10-15% on average. The treatments were 4 applications of Kocide 2000, 5 applications of Kocide 2000 and a control. As with the 2003 data, the % moss increased slightly from the first observation date to the second observation date. On the third and fourth observations dates the % moss decreased very slightly. The % moss rating after the 4th application of Kocide 2000 showed a dramatic decrease, down to less than 2% moss (Figure 2). This data reflects the results from Cornell University that found that at least 4 applications of Kocide are necessary to achieve good moss control. One part of the study that is yet to be determined is the effect of the 2004/2005 winter on the moss. Percent moss will be determined in the spring of 2005 to determine if there was an increase or decrease in the moss control treatments over the winter.