Full TGIF Record # 83595
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Publication Type:
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Report
Content Type:Abstract or Summary only
Author(s):Beam, J. B.; Askew, S. D.; Jennings, K. M.
Author Affiliation:Beam and Askew: Virginia Tech, Blacksburg, Virginia; and Jennings: BASF Corporation, RTP, North Carolina
Title:Prohexadione calcium for turfgrass and weed management
Section:Weed management in turf, pasture, and rangeland
Other records with the "Weed management in turf, pasture, and rangeland" Section
Meeting Info.:55th Annual Meeting, Atlanta, GA: January 28-30, 2002
Source:Southern Weed Science Society Proceedings. Vol. 55, 2002, p. 62-63.
Publishing Information:Champaign, IL: Southern Weed Science Society.
# of Pages:2
Abstract/Contents:"Gibberellin inhibitors, e.g. paclobutrazol and trinexapac-ethyl, reduce clipping weights and mowing requirements in most turfgrass species. Paclobutrazol also controls annual bluegrass (Poa annua). Prohexadione calcium, a new gibberellin inhibitor for turfgrass, was tested for turfgrass growth management and annual bluegrass control in Virginia. In growth management esperiments, plots were mowed weekly for 10 wk and clippings collected, dried, and weighed beginning on August 15, 2001. Field-tested species included established stands of bermudagrass (Cynodon dactylon (L.) Pers. 'Vamont'), Kentucky bluegrass (Poa pratensis L. 'Midnight'), perennial ryegrass (Lolium perenne L. 'Prosport'), and zoysiagrass (Zoysia japonica Steud. 'Mayer'). Greenhouse-tested species included perennial ryegrass 'Prosport', tall fescue (Festuca arundinacea Schreb 'Chewings') and Kentucky bluegrass 'Viva'. One day after the second weekly mowing, prohexadione calcium was applied with 0.25% v/v Kineticā„¢ nonionic surfactant (NIS) at 0, 0.14, 0.27, 0.41, 0.54, and 0.68 kg ai/ha. Comparison treatments included NIS alone and trinexapac-ethyl at the label rate for each species. A second application was applied 3 wk after the first for prohexadione calcium and 4 wk for trinexapac-ethyl. Data were subjected to analysis of variance and regression analysis was used to describe the effects of prohexadione calcium rate on clipping biomass. Based on regression trends from field experiments, prohexadione calcium reduced 8 wk cumulative clipping biomass of all species and reduced turfgrass growth equivalent to trinexapac-ethyl at rates of 0.2 kg ai/ha in Kentucky bluegrass, 0.7 kg ai/ha in perennial ryegrass, 0.7 kg ai/ha in bermudagrass, and 0.3 kg ai/ha in zoysiagrass. In greenhouse experiments, prohexadione calcium reduced 6 wk cumulative clipping biomass equivalent to trinexapac-ethyl at rates of 0.4 kg ai/ha in tall fescue, 0.2 kg ai/ha in Kentucky bluegrass, and 0.7 kg ai/ha in perennial ryegrass. Significant discoloration of Kentucky bluegrass and perennial ryegrass was noted with trinexapac-ethyl and prohexadione calcium in field experiments following first frost. Discoloration did not occur in greenhouse experiments. In annual bluegrass control experiments, prohexadione calcium was applied at the same rates and timings as in growth management experiments, although additional treatments were added. Field studies were conducted at Virginia Tech Golf Course in Blacksburg, VA and Chantilly Turf Farms in Chantilly, VA. At Blacksburg, prohexadione calcium was applied three times at 3 wk intervals and ethofumesate at 1.5 kg ai/ha (applied twice at 3 wk intervals) was included as a comparison. At Chantilly, prohexadione calcium was applied twice at 3 wk intervals and paclobutrazol at 0.56 kg ai/ha (applied twice at 3 wk intervals) was the comparison treatment. Two additional comparison treatments were included at both locations to evaluate adjuvants [1% v/v crop oil concentrate (COC) and 1% v/v methylated seed oil (MSO)] with prohexadione calcium at 0.41 kg ai/ha. At Blacksburg, tests were conducted on a Kentucky bluegrass fairway with 5 to 90% annual bluegrass coverage. At Chantilly, tests were conducted in a fallow area with 95% or greater annual bluegrass coverage. Ethofumesate controlled annual bluegrass >90% 8 and 12 wk after initial treatment (WAT). Prohexadione calcium + NIS at increasing rates controlled annual bluegrass 40 to 70% 8 WAT and 50 to 80 % 12 WAT. Annual bluegrass control by prohexadione calcium was not affected by adjuvant type. Prohexadione calcium controlled annual bluegrass equivalent to paclobutrazol at rates of 0.41 kg ai/ha or greater."
Language:English
References:0
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Beam, J. B., S. D. Askew, and K. M. Jennings. 2002. Prohexadione calcium for turfgrass and weed management. South. Weed Sci. Soc. Proc. 55:p. 62-63.
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