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As density of treated fairways increases due to altered growth habit, ball playability may improve, causing ball to sit higher on turf. This result is most evident on hybrid bermudagrass. Seedhead formation will not be prevented. Seedheads should be mowed off as they grow above turf cutting height to maintain a desirable -looking turf. Excessive irrigation and/or nitrogen fertilization may shorten period of growth regula- tion. Regulator response will vary somewhat according to turf variety. For St. Augustinegrass, Bitter Blue will be the most responsive and Floratam the least responsive. HYBRID BERMUDAGRASS Cultivar Sensitivity/Activity Period of Growth Period of Color Regulation Response Tifway I, II Medium/Good 5 - 6 weeks 6 - 8 weeks Tifgreen High/Excellent 6 - 8 weeks 8 - 10 weeks Ormond High/Excellent 6 - 8 weeks 8 - 10 weeks ST. AUGUSTINEGRASS Cultivar Sensitivity/Activity Period of Growth Period of Color Regulation Response Floratam Low/Moderate 4 - 6 weeks 5 - 8 weeks Floralawn Low/Moderate 4 - 6 weeks 5 - 8 weeks Floratine Medium/Good 6 - 7 weeks 7 - 8 weeks Raleigh, Texas Medium/Good 6 - 7 weeks 7 - 8 weeks Common Bitter Blue, Seville High/Excellent 7 - 8 weeks 8 - 10 weeks Program Scheduling If crabgrass or other annual grassy weeds have been a problem in the past, an applica- tion of the appropriate preemergence weed control product should be made before the use of Clarelle. Space the applications of Clarelle and oxadiazon-based preemergence products at least 4 weeks apart on putting greens. If a weed, disease or insect problem occurs after application of Clarelle, apply an appropriate control product at its recommended rate. Clarelle is compatible with most existing control products. Use of Clarelle in combination with fungicides containing propiconazole, fenarimol, triadimefon, and myclobutanil can result in increased growth inhibition of Poa annua on putting greens.