Full TGIF Record # 12495
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Publication Type:
Author(s):Zuris, Nancy K.; Wilson, Robert G.
Author Affiliation:Zuris: Graduate Research Assistant; Wilson: Weed Specialist, University of Nebraska, Scottsbluff, NE
Title:Effect of plant growth stage and rate of chlorsulfuron on Canada thistle control
Section:Physiology, edaphic factors and control of specific weeds
Other records with the "Physiology, edaphic factors and control of specific weeds" Section
Meeting Info.:Winnipeg, Manitoba, Canada: December 4-6, 1984
Source:Proceedings: North CentralWeed Control Conference. Vol. 39, 1984, p. 79.
# of Pages:1
Publishing Information:[Urbana, Illinois: Department of Agronomy, University of Illinois]
Keywords:TIC Keywords: Growth stages; Growth rate; Chlorsulfuron; Cirsium arvense; Weed control
Abstract/Contents:"Field studies were conducted in 1982, 1983, and 1984 to evaluate the performance of chlorsulfuron applied at 0.009, 0.017, 0.034, 0.067, 0.134, and 0.269 kg ai/ha plus 0.25% (v/v) surfactant to Canada thistle in the spring rosette, bud and fall rosette stages of growth. Stand densities, root lengths and secondary shoot densities measured in the spring following chlorsulfuron applications the previous year indicated that the rate of chlorsulfuron needed to control Canada thistle was dependent upon the growth stage at application. Canada thistle stand densities, root length and secondary shoot densities were lower when chlorsulfuron was applied in the bud and fall rosette stages of growth as compared to applications made during the spring rosette stage of growth. Control of Canada thistle from applications of chlorsulfuron during the bud and fall rosette stages of growth increased with rate, and was greatest at 0.269 kg ai/ha. None of the six chlorsulfuron treatments applied at the fall rosette growth stage provided complete eradication of Canada thistle root tissue at any soil depth. The distribution of Canada thistle root lengths in untreated checks significantly declined the deeper Canada thistle roots penetrated the soil profile. In areas treated with chlorsulfuron at 0.269 kg ai/ha root lengths between different soil depths were not different. Canada thistle root lengths measured in the 0 to 30.5 cm, 30.5 to 61 cm and 61 to 91.4 cm soil depths were reduced in plots treated with chlorsulfuron at 0.269 kg ai/ha in comparison to root lengths in untreated checks."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Zuris, N. K., and R. G. Wilson. 1984. Effect of plant growth stage and rate of chlorsulfuron on Canada thistle control. Res. Rep. North Cent. Weed Control Conf. 39:p. 79.
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