Full TGIF Record # 25347
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Web URL(s):http://www.wsweedscience.org//wp-content/uploads/proceedings-archive/1992.pdf#page=106
    Last checked: 05/04/2017
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Publication Type:
i
Report
Content Type:Abstract or Summary only
Author(s):Ferrell, M. A.; Koch, D. W.; Ogg, P. J.; Hruby, F.
Author Affiliation:Extension Pesticide Ckoordinator, Extension Agronomist, Senior Agronomist, and Research and Extension Center Superintendent, Department of Plant, Soil and Insect Sciences, University of Wyoming
Title:Grass tolerance to imazethapyr
Meeting Info.:March 10-12, 1992; Salt Lake City, Utah
Source:Proceedings of the Western Society of Weed Science. Vol. 45, 1992, p. 95-97.
# of Pages:3
Publishing Information:Logan, UT: Plant Science Dept., Utah State University.
Keywords:TIC Keywords: Imazethapyr; Resistance; Nitrogen; Injuries; Weed control; Surfactants
Abstract/Contents:"A field study was initiated at the Research and Extension Center, Archer, Wyoming in the spring of 1991 to evaluate the effects of postemergent imazethapyr plus surfactant, with or without liquid nitrogen, treatments on seedling grasses and weed control. Seeded grasses were wheatgrass, crested (Hycrest); wheatgrass, intermediate (Oahe); fescue, tall (Fawn); bluegrass, big (Sherman); wildrye, Russian (Bozoisky); and bromegrass, smooth (Manchar). Visual grass stand ratings and visual grass injury ratings show imazethapyr, with or without liquid nitrogen, did not reduce grass stands and there were no visible signs of injury when applied to 2.5-to 5-leaf grasses. Grass stands were better in treated versus untreated plots. Oahe (72%) had very good establishment, followed by Manchar (65%). Fawn (50%) and Hycrest (47%) had equal stands with moderate establishment and Sherman (18%) and Bozoisky (8%) had poor establishment. Prostrate knotweed control was excellent for both rates of imazethapyr, with or without liquid nitrogen. Kochia control was between 75 and 79% for all treatments; however, imazethapyr with liquid nitrogen provided 3% better kochia control than imazethapyr without liquid nitrogen (Table 1). Greenhouse experiments were initiated in 1991 to evaluate the effects of postemergence imazethapyr plus surfactant, with or without liquid nitrogen, treatments on seedling perennial grasses at the Plant, Soil, and Insect Science greenhouse, Laramie, Wyoming. Grasses were the same as in the field study. One-leaf grass was injured by 1 and 2 oz/A rates of imazethapyr 1 month after treatment and continued to show injury 4 months after treatment. Grass injury was reflected in less plants/pot and reduced grass height when evaluated 1, 3 and 4 months after treatment. Grasses showing the greatest injury to 1 oz of imazethapyr 1 month after treatment were crested wheatgrass (74%), Russian wildrye (72%) and smooth brome (66%). Most tolerant to the 1 oz rate was big bluegrass (44%). Grasses least tolerant to the 2 oz rate 1 month after treatment were big bluegrass (81%), crested wheatgrass (79%) and smooth brome (77%). Intermediate wheatgrass (59%) and tall fescue (60%) were the most tolerant to the 2 oz rate. The 2 oz rate of imazethapyr caused an average of 8% more injury to grasses than the 1 oz rate 1 month after treatment (Table 2). Grass injury ranged between 10 and 56% 3 months after treatment for the 1 oz rate and between 38 and 98% for the 2 oz/A rate, depending on variety (Table 3). Four months after treatment grasses were still showing considerable injury with ranges between 5 and 41% for the 1 oz/A rate and 32 to 90% for the 2 oz rate, again dependent upon variety (Table 4). The greenhouse experiment was repeated with grasses in the 2.5-to 4.5-leaf stage. Grass injury, number of plants/pot, and grass height rating taken 1 month after treatment show imazethapyr did not reduce grass stands or grass height and there were no visible signs of injury (data not shown). (Published with the approval of the Wyoming Agricultural Experiment Station.)"
Language:English
References:0
Note:Tables
This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Ferrell, M. A., D. W. Kock, P. J. Ogg, and F. Hruby. 1992. Grass tolerance to imazethapyr. Proc. West. Soc. Weed Sci. 45:p. 95-97.
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Web URL(s):
http://www.wsweedscience.org//wp-content/uploads/proceedings-archive/1992.pdf#page=106
    Last checked: 05/04/2017
    Requires: PDF Reader
    Notes: Item is within a single large file
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MSU catalog number: SB 610 .W43 v.45
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