Moss is an issue on golf greens all over the world. In the past 30 years, mowing heights get lower and pesticides continue to evolve to safer chemistries. The denser the turf stand, moss is less likely an issue. We greens were mowed at 1/4", moss was not an issue. Old fungicides that contained heavy metals like mercury or zinc, controlled moss. Today, those fungicides are not available.
We see moss primarily on mounds. This is because the height of cut on these areas tends to be slightly lower than other areas of the green. Thinner turf means more opportunity for moss invasion. Ballmarks that are not fixed also provide a good spot for moss.
There are several methods to control moss:
1. An herbicide called Quicksilver. Quicksilver is labeled to control broadleaf weeds. However, even though this chemical is labeled for moss control on greens as well, I do not take spraying any herbicide on greens lightly.
2. An organic product called Moss Buster. Moss Buster works well but can only be spot sprayed because it will severely yellow the turf. The photo above shows moss that was spot treated with Moss Buster.
3. A three way fungicide mix of Daconil, Thiram and Mancozeb. Although somewhat costly, this combination is very effective and safe.
None of the above give 100% control but if the conditions are right! we can get close. The best option is to keep up with moss as it shows up and to not allow it to become a widespread problem. In a Climate with 100 inches of rain annually, moss will continue to be a challenge.