Full TGIF Record # 13701
Item 1 of 1
Publication Type:
Author(s):Yousten, Joann
Title:Weed Control Evaluations - Spot Spraying: III. Post-emergent Crabgrass Control
Source:Kentucky Turfgrass Research. No. 313, 1987, p. 57-58.
Publishing Information:Lexington, KY: University of Kentucky, College of Agriculture, Cooperative Extension Service
Keywords:TIC Keywords: Poa pratensis; Digitaria sanguinalis; Cyperus; Fenoxaprop-ethyl; MSMA; Selective herbicides; Postemergence herbicides; Spot spraying; Imazaquin; Irrigation; Injuries
Abstract/Contents:Results of irrigated and non-irrigated tests for post-emergent crabgrass control in Kentucky bluegrass turf with spot spray herbicide applications. The herbicides used in the non-irrigated test were Daconate 6 at 2.4 lb ai/A (in a .25% solution), 4.8 lb ai/A (in .5% solution), and 7.2 lb ai/A (in .75% solution) p: Acclaim at 2.5 lb ai/A (in .25% solution), 5 lb ai/A (in .5% solution), and 7.5 lb ai/A (.75% solution). These rates are higher than the available recommended rates, both in lb ai/A and solution percentage. The treatments were applied on July 30 with a hand-trigger spray bottle that delivered 1 ml per squirt and was adjusted to spray a coarse mist to cover about 1 sq.ft. Each spot received 10 ml to supply the desired amount of active ingredient. The test was observed for two months, during which time the weather was hot and dry, contributing to turfgrass infury. All the Daconate spots were completely killed, and by the end of two mohths, other weeds were invading the spots. Eigher the Daconate rates or concentrations were too high for safe spot-spray weed control. All rates of the Acclaim adequately controlled even large crabgrass plants, with the high rate acting more quickly. The Acclaim also injured the bluegrass less; the bluegrass seemed only as injured as the drought stricken controls, until the end of two months when the treated turf looked worse. Regular irrigation in the future may help the grass recover and show differences in the treatments. The Daconate rates were too high and killed entire spots. After two months the low rate spots had vigorous new crabgrass while the medium and high rate spots had less crabgrass regrowth. The Daconate spots had no recovering turf. Acclaim controlled crabgrass but injured turf more at higher rates. After two months few spots had recovering turf. All Scepter rates stopped nutsedge growth without apparent turf injury but after two months the turf died and some nutsedge was recovering. The untreated checks remained more green and healthy than did treated plots. All rates were too high for the water stressed turf.
See Also:See also Part I, "Selective tall fescue control," p. 56, R=13699. R=13699

See also Part II, "Herbicide volume," p. 56-57, R=13700. R=13700

See also Part IV, "Control of yellow nutsedge in bermudagrass," p. 58-59, R=13702. R=13702
Note:Part 3 of 4.
Geographic Terms:Kentucky
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Yousten, J. 1987. Weed Control Evaluations - Spot Spraying: III. Post-emergent Crabgrass Control. KY. Turfgrass Res. 313:p. 57-58.
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MSU catalog number: SB 433 .A1 K4
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