QuickSilver herbicide works by effectively inhibiting a key enzyme in moss chlorophyll production. Effective in reducing up to 90% of silvery thread moss Controls moss in just two applications when applied at a rate of 6.7 fluid ounces of product per acre (0.154 fluid ounces of product per 1,000 square feet) two weeks apart Extremely gentle on turf, including most creeping bentgrass and Bermudagrass varieties Works in both cool and warm temperatures for year-round control as needed.