Full TGIF Record # 248143
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Publication Type:
Author(s):Hall, Anthony B.
Author Affiliation:Ph.D. and Dow Chemical USA, Cincinnati, Ohio
Title:Control of perennial roadside weeds by picloram and triclopyr
Section:Forer forests, rights-of-way, industrial weed control
Other records with the "Forer forests, rights-of-way, industrial weed control" Section
Meeting Info.:Winnipeg, Manitoba, Canada: December 4-6, 1984
Source:Proceedings: North CentralWeed Control Conference. Vol. 39, 1984, p. 73.
# of Pages:1
Publishing Information:[Urbana, Illinois: Department of Agronomy, University of Illinois]
Abstract/Contents:"Adequate motorist visibility requires the control of tall-growing broadleaf weed species. Rising fuel and labor costs associated with frequent mowing of highway rights-of-way have encouraged state highway departments to examine chemical weed control methods as economical alternatives to mowing. Chemical weed control programs for highways have relied heavily upon 2,4-D and dicamba herbicides for broadleaf weed control. Continued use of these herbicides controlled many species, but perennial weeds such as Canada thistle and common milkweed and the biennial wild carrot have not been controlled in the Midwest and have flourished. The purpose of this research was to evaluate the performance of triclopyr, picloram and 2,4-D combinations on these difficult to control weed species along Midwest roadsides. Treatments consisting of combinations of the potassium salt of picloram, the triethylamine salt of triclopyr (tea), the butoxyethyl ester of triclopyr (bee) and the alkanolamine salt of 2,4-D were applied in 1982 and 1983 to roadsides in Illinois, Indiana, Michigan and Ohio by a pickup truck roadside sprayer in 25 or 40 gallons per acre of total spray volume. Treatments were evaluated six weeks following treatment for percent control of the target weed species and one year following treatment for general broadleaf weed control. Treatments containing picloram produced the best results six weeks and one year following treatment. Picloram plus triclopyr (bee) at 0.5 + 0.5 lb ai/A provided control exceeding 95% for Canada thistle, common milkweed and wild carrot six weeks after treatment and one year after treatment, general broadleaf weed control was 85%. Picloram plus 2,4-D at 0.5 + 1.42 lb ai/A provided similar results, with slightly less control of wild carrot six weeks after treatment and 90% general broadleaf weed control one year after treatment. Triclopyr (bee) plus 2,4-D at 0.5 + 1.9 lb ai/A provided 75% to 88% control of target weed species six weeks after treatment and 80% control of broadleaf weeds one year after treatment. Triclopyr (tea) plus 2,4-D at 1 + 0.95 lb ai/A provided similar control six weeks after treatment but control of general broadleaf weeds was only 60% one year after treatment. Applications of picloram plus 2,4-D at 0.5 + 1.9 lb ai/A made in May through August provided excellent control of Canada thistle, common milkweed and wild carrot due to the residual activity of picloram. Best results were obtained with triclopyr and 2,4-D combinations when applications were made to actively growing weeds from mid-June through August. No treatment injured desirable turf grass species during these investigations."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Hall, A. B. 1984. Control of perennial roadside weeds by picloram and triclopyr. Res. Rep. North Cent. Weed Control Conf. 39:p. 73.
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