Full TGIF Record # 19837
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Publication Type:
Author(s):Rosemond, J. M.; Witt, W. W.; Powell, A. J.
Title:Nimblewill control in Kentucky bluegrass turf and pasture
Source:Kentucky Turfgrass Research. 1982, p. 53-54.
Publishing Information:Lexington, KY: University of Kentucky, College of Agriculture, Cooperative Extension Service
Keywords:TIC Keywords: Poa pratensis; Pastures; Muhlenbergia schreberi; Linuron; Chemical weed control; Selective herbicides; Field tests; Injuries; Herbicide rates; Herbicide timing
Abstract/Contents:Describes field test which studied application rate and timing for selective control of nimblewill in Kentucky bluegrass turf and pasture with linuron. When applied to highly managed turf, data indicated that a sequential linuron treatment of 1.0 lb/A two weeks apart in August provided excellent nimblewill control with the least initial injury to Kentucky bluegrass. A single treatment of 1.0 lb/A in August provided reduced nimblewill control. Single treatments of 3.0 or 4.0 lb/A in August resulted in a unacceptable initial injury to bluegrass turf. Sequential treatments above 1.0 lb/A also resulted in unacceptable injury. Although October applications resulted in less initial bluegrass injury, nimblewill control was reduced. It appeared that Kentucky bluegrass could tolerate only 1.0 lb/A linuron treatments at one time or a single treatment of 2.0 lb/A and still get rapid bluegrass recovery. Rates higher than 2.0 lb/A took longer to recover or reduced bluegrass stand was observed. Data indicated that 100% nimblewill control with the least injury to bluegrass could be achieved if linuron was applied at a time when nimblewill was actively growing and Kentucky bluegrass was still semi-dormant. If applied later, nimblewill control would be reduced. When linuron was applied to a pasture system, results were similar to those in turf. A 1.0 lb/A sequential treatment in August again provided 100% nimblewill control with the least initial injury to bluegrass. A single application of 1.0 lb/A at anytime provided reduced nimblewill control. Higher single and sequential rates of linuron could be tolerated by pasture systems mainly because of the taller and more vigorous bluegrass. It appeared that sequential treatments were more effective for nimblewill control because the first treatment reduced the canopy and weakened the plant enough so as to allow the second treatment to completely kill the plant. June or July treatments were less effective than August or September. It was hypothesized that enough time was available to allow for nimblewill recovery before going dormant in the fall. If linuron was applied in early fall, nimblewill control was reduced, possibly because of reduced absorption and translocation of linuron.
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Rosemond, J. M., W. W. Witt, and A. J. Powell. 1982. Nimblewill control in Kentucky bluegrass turf and pasture. KY. Turfgrass Res. p. 53-54.
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MSU catalog number: SB 433 .A1 K4
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