8/24/2023 0 Comments Seashore paspalum in hawaiiAtrazine is not labeled for use on turfgrass in Hawaii and causes unacceptable injury to seashore paspalum ( Purdue University, 2018 Yu et al., 2015). augustinegrass ( Stenotaphrum secundatum) with sequential applications of ethofumesate plus atrazine ( McCarty, 1996). However, selective bermudagrass suppression has been achieved in st. Ethofumesate, fluazifop, and clethodim alone or in combinations have been ineffective at bermudagrass suppression, and damage to the seashore paspalum was considered unacceptable ( McCullough, 2017).īermudagrass control on golf courses has relied on spot treatments of glyphosate ( Johnson, 1988). However, seashore paspalum injury was considered unacceptable for practical use ( Johnson and Duncan, 2000). Bermudagrass suppression in seashore paspalum turf was achieved by sequential applications of ethofumesate plus flurprimidol. Selective suppression of bermudagrass is attributed to higher foliar and root absorption of ethofumesate relative to seashore paspalum ( McCullough et al., 2016). The only selective herbicide labeled for bermudagrass suppression in seashore paspalum is ethofumesate ( Bayer CropScience, 2017a). Bermudagrass irrigated with saline nonpotable water results in unacceptable turf quality ( Wiecko, 2003).Īs more seashore paspalum golf courses are established, bermudagrass contamination is a common unsolved problem among Hawaii’s turfgrass managers. This increase in soil salinity has contributed to the use of seashore paspalum due to its high tolerance to saline soils and nonpotable irrigation water ( Lee et al., 2004). Emphasis on potable water conservation and increased use of recycled water on turfgrass are major contributors to increased soil salinity ( Duncan and Carrow, 1998). In recent years, some golf courses in Hawaii have replaced or are replacing bermudagrass with seashore paspalum on greens or as their primary fairway turfgrass. Keywords: Cynodon dactylon, ethofumesate golf course fairway Paspalum vaginatum, mesotrione metribuzin safening topramezone weed control and suppression Tank mixes of mesotrione, topramezone, metribuzin, and ethofumesate have the potential for bermudagrass suppression and control of other grassy weeds in seashore paspalum turf. The addition of metribuzin and/or ethofumesate to the tank mix safened (reduced turf discoloration) seashore paspalum to topramezone or mesotrione foliar bleaching. At the Magoon Research Station, maximum selective bermudagrass suppression was achieved with tank mixes of topramezone (0.01 lb/acre) + ethofumesate (1.00 lb/acre) and topramezone (0.01 lb/acre) + metribuzin (0.09 lb/acre) + ethofumesate (1.00 lb/acre). Unacceptable seashore paspalum turf injury was obtained in all treatments that did not include metribuzin. At the Hoakalei Country Club, maximum bermudagrass injury with minimal seashore paspalum discoloration was obtained with tank mixes of mesotrione (0.06 lb/acre) + metribuzin (0.19 lb/acre) + ethofumesate (1.00 lb/acre) and topramezone (0.02 lb/acre) + metribuzin (0.19 lb/acre) + ethofumesate (1.00 lb/acre). Spray applications of the herbicides mesotrione, topramezone, metribuzin, and ethofumesate were evaluated alone and in tank mixtures for bermudagrass suppression and seashore paspalum injury. Herbicide efficacy studies were conducted at the Hoakalei Country Club and the Magoon Research Station on the island of Oahu in Hawaii. An ongoing challenge many seashore paspalum turf managers struggle with is bermudagrass ( Cynodon dactylon) infestations. The use of nonpotable water for irrigation on various sport venues has led to an increased use of seashore paspalum ( Paspalum vaginatum) turf in Hawaii.
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