Full TGIF Record # 240557
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Publication Type:
Author(s):Herron, J. W.
Author Affiliation:Department of Horticulture, University of Kentucky, Lexington, KY
Title:Control of nimblewill in bluegrass turf
Section:Weed control in turf
Other records with the "Weed control in turf" Section
Meeting Info.:St. Louis, Missouri: December 11-13, 1961
Source:EighteenthAnnual Research Report: North Central Weed ControlConference. 1958, p. 37.
# of Pages:1
Publishing Information:[Lincoln, Nebraska]: [North Central Weed Science Society]
Keywords:TIC Keywords: Application timing; Chemical control; Herbicide evaluation; Muhlenbergia schreberi; Poa pratensis; Weed control
Abstract/Contents:"Nimblewill is a shallow rooted perennial grass that is becoming an increasingly important problem in bluegrass lawns in Kentucky. Its methods of reproduction are by seeds and creeping stolons. The tops die in late fall and winter. In Kentucky vegetative growth from the nodes usually starts in February or early March. Cultural methods for controlling this weed require constant vigilance and much work. Nimblewill can often be prevented from spreading by pulling scattered plants as soon as they are noticed. It is important to remove as many of the stolons as possible since even a small portion may develop into a new plant. Satisfactory control by this method is almost impossible on large infested areas. In the summer of 1953 a study was initiated to determine if there was a selective herbicide that could be used for controlling nimblewill in lawns of Kentucky bluegrass (Poa pratensis). Several herbicides were applied to mixed bluegrass and nimblewill turf at the following rates: potassium cyanate (KOCN), 25, 50, and 100 lb/A; sodium salt of TCA, 25, 50, and 100 lb/A; amine salt of DNBP, 4, 6, and 8 lb/A; MH, 3, 5, and 7 lb/A. Applications on different plots were made on May 31, June 30, July 28, and August 31. Similar treatments were applied in 1954. Although top injury of both grasses occurred from treatments with KOCN and DNBP, they recovered by late summer or the following spring. Treatments with TCA resulted in more than 50 per cent kill of bluegrass as well as nimblewill. Top injury to the bluegrass resulted from treatments with MH the first season, but by the following spring there was over 90 per cent control of nimblewill on plots treated at the 5 and 7 pound rates, with no apparent reduction of bluegrass. From results obtained in 1953 and 1954, it was felt that MH was the only herbicide included in previous experiments that warranted further testing in 1955. Applications were made in 1955, 1956 and 1957 at the same rates as in 1953 and 1954. Ten days after applications were made, one-half of each plot was shallow disked. Disking did not appear to increase the effectiveness of MH on either nimblewill or bluegrass. These experiments showed that MH, applied at 7 lb/A, was the most effective chemical treatment for controlling nimblewill, with very little, if any, permanent injury to Kentucky bluegrass. Applications should be made when nimblewill is making its most rapid growth. During extremely dry periods satisfactory control was not obtained. Spot treatments on smaller areas may be necessary in subsequent years. The rates of MH used seem to be exceptionally high, and one would anticipate severe injury or complete kill of the bluegrass, but this is not the case. At the present time this treatment is not feasible for use on extremely large areas, but until a more effective and less expensive method of controlling nimblewill is found, MH may be a practical method for controlling this weed in the average home lawn."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Herron, J. W. 1958. Control of nimblewill in bluegrass turf. Proc. North Cent. Weed Sci. Soc. p. 37.
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MSU catalog number: SB 610 .N6
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