Measuring water use on U.S. golf courses is an essential component of measuring best management practice adoption. To provide timely and meaningful education regarding current water use, continued measurement of golf course water use is necessary. The objective of this study was to assess the current water use and related management practices on U.S. golf courses in 2020. A survey was developed and distributed electronically to 14,145 U.S. golf courses with 11% responding. Since the initial survey conducted in 2005, water applied as irrigation to U.S. golf courses declined by 29% from 2.38 to 1.69 million acre‐ft. Factors contributing to this decline include a 12% reduction in golf facilities and a 25% reduction in water applied per acre since 2005. Reductions in water applied per acre were also measured in most regions except in the Southwest region, where an increase in water applied per acre was reported, which was probably a result of the increased stress the turfgrass may have experienced under the reduced precipitation and increased heat in the Southwest region. The responses indicate that golf course superintendents continue to use management practices associated with efficient water use. The use of technologies such as handheld moisture meters and drought‐tolerant turfgrass has increased since 2013, indicating that golf superintendents are receptive to using both new and traditional technologies to reduce water use.

Potassium azide (PA) (112 kg/ha), oxadiazon + 1,3-dichloropropene (1,3-D) (168 kg/ha + 140 L/ha), dazomet (392 kg/ha), dazomet + chloropicrin (392 + 168 kg/ha), dazomet + 1,3-D (392 kg/ha + 140 L/ha), iodomethane (IM) (336 kg/ha), metam-sodium (MS) (748 L/ha), MS + chloropicrin (748 L/ha + 168 kg/ha), and MS + 1,3-D (748 + 140 L/ha) were evaluated at Jay and Arcadia, FL, in 1998 and 1999 as alternatives to methyl bromide (MeBr) fumigation for the management of common turfgrass weeds. Potassium azide was as effective as MeBr in controlling ‘Coastal’ bermudagrass, yellow and purple nutsedges, alexandergrass, broadleaf signalgrass, tall and sharppod morningglories, and various winter annual broadleaf weeds, but it failed to provide acceptable control of redroot pigweed. 1,3-Dichloropropene + oxadiazon did not control yellow nutsedge, purple nutsedge, or Coastal bermudagrass. Similarly, this combination treatment failed to control carpetweed but did provide 83% control of the winter annual weed species, 71% c...

Purple nutsedge management with herbicides (halosulfuron, imazaquin, MSMA, S-metolachlor, and sulfentrazone) and mowing was investigated in a bare ground homogenous purple nutsedge field site. Mowing at 5 cm increased control of purple nutsedge by 6% compared to not mowing. Sequential applications of halosulfuron, MSMA, and sulfentrazone provided at least 80% control of purple nutsedge shoots, whereas imazaquin controlled purple nutsedge shoots less than 65%. All herbicide treatments reduced purple nutsedge total and viable tuber densities at least 40%. S-metolachlor PRE reduced total and viable tuber densities 65 and 69%, respectively. Sequential applications of sulfentrazone or MSMA reduced total and viable tubers 80%. Early postemergence (EPOST) or EPOST followed by late-postemergence applications of halosulfuron and imazaquin reduced total and viable tuber densities 52 and 59%, respectively. Data indicate that S-metolachlor PRE and sequential applications of MSMA and sulfentrazone may be viable treatments for control of purple nutsedge shoots and tubers.Nomenclature: Halosulfuron; imazaquin; MSMA; S-metolachlor; sulfentrazone; purple nutsedge, Cyperus rotundus L. #3 CYPRO.Additional index words: Purple nutsedge control, purple nutsedge tuber viability.Abbreviations: EPOST, early postemergence; LPOST, late-postemergence; WALP, weeks after late-postemergence; WAT, weeks after treatment.