Full TGIF Record # 8273
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Publication Type:
Content Type:Abstract or Summary only
Author(s):Goatley, Mike
Author Affiliation:University of Kentucky
Title:Selective tall fescue control
Source:Kentucky Turfgrass Research. 1985, p. 23.
Publishing Information:Lexington, KY: University of Kentucky, College of Agriculture, Cooperative Extension Service
Keywords:TIC Keywords: Festuca arundinacea; Chlorsulfuron; Diclofop; Sulfometuron; Poa pratensis; Application rates; Phytotoxicity; Weed control; Injuries; Selective weed control; Herbicides; Herbicide rates
Abstract/Contents:"Field studies over a two-year period indicated chlorsulfuron, dicofop, and sulfometuron had potential for tall fescue control with varying degrees of Kentucky bluegrass injury. Sulfometuron applied in the fall at rates ranging from 0.035-0.14 kg/ha provided excellent tall fescue control, but initial bluegrass phytotoxicity was severe and recovery required three to four months. Chlorsulfuron treatments appplied in the fall at 0.21 kg/ha gave moderate tall fescue control with minimal Kentucky bluegrass injury. Chlorsulfuron rates of 0.07 and 0.14 kg/ha gave variable tall fescue control with moderate Kentucky bluegrass injury. Spring treatments were made using higher rates for chlorsulfuron and diclofop since tall fescue and Kentucky bluegrass tolerance to these materials apparently increased when the grasses began to grow rapidly. Sulfometuron treatments were again applied at rates of 0.035 to 0.14 kg/ha and while tall fescue control was excellent, Kentucky bluegrass injury was severe. The best tall fescue ratings for chlorsulfuron were obtained with rates of 0.28 to 0.42 kg/ha applied in either single or split applications. The 0.42 kg/ha rate provided almost complete tall fescue control with minimal Kentucky bluegrass damage. Spring treatments of diclofop at 3.36, 4.78, and 6.72 kg/ha gave excellent tall fescue control. In general, as the diclofop rates increased there was more tall fescue control, but also more Kentucky bluegrass injury. All herbicide applications completely suppressed tall fescue seedhead emergence in spring treatments. The highest rate of any material provided the best reduction in Kentucky bluegrass seedhead height and seedhead count, but there was more potential for bluegrass injury. Chlorsulfuron and sulfometuron treatments provided excellent broadleaf weed control and were lacking only in control of plantains (Plantago spp.), speedwell (Veronica filiformis Sm.) and wild violet (Viola spp.). No control of annual grass weeds was found. Diclofop gave very poor weed control for either broadleaf weeds or grasses. It actually appeared to stimulate the growth of white clover (Trifolium repens L.) which could be beneficial for pasture areas. Laboratory studies were conducted to determine the basis for chlorsulfuron selectivity. Slight but significant differences in the foliar absorption and translocation, foliar metabolism, and large differences in root translocation of chlorsulfuron between Kentucky bluegrass and tall fescue appeared to account for the selectivity observed in the field."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Goatley, M. 1985. Selective tall fescue control. KY. Turfgrass Res. p. 23.
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MSU catalog number: SB 433 .A1 K4
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