Full TGIF Record # 227133
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Web URL(s):http://www.swss.ws/wp-content/uploads/docs/2012 Proceedings-SWSS.pdf#page=290
    Last checked: 08/07/2013
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Publication Type:
i
Report
Author(s):Bristow, C. L.; McElroy, J.; Guertal, E. A.
Author Affiliation:Auburn University, Auburn, AL
Title:Integrating zinc into annual bluegrass control programs in bermudagrass putting greens
Section:Graduate student contest
Other records with the "Graduate student contest" Section
Meeting Info.:Charleston, South Carolina: January 23-25, 2012
Source:2012 Proceedings, Southern Weed Science Society. Vol. 65, 2012, p. 218.
Publishing Information:Champaign, Illinois: Southern Weed Science Society
# of Pages:1
Keywords:TIC Keywords: Herbicide efficacy; Herbicide evaluation; Herbicide program; Herbicide resistance; Poa annua control; Soil pH; Zinc
Abstract/Contents:"Annual bluegrass (Poa annua L.) is one of the most problematic weeds in turfgrass. Due to prolific seedhead production and an increase in herbicide resistance, herbicide efficacy varies and is sometimes less than desirable. However, integration of cultural control practices could lead to improved weed control. Initial research shows that zinc, which is commonly applied as a micronutrient, has a negative effect on annual bluegrass when applied at non-agronomic rates. Additionally, literature indicates that acidifying the zone of germination reduces annual bluegrass emergence. The objectives of this research were: 1) determine the tolerance of various turfgrass seedlings to zinc at three soil pH levels, and, 2) evaluate annual bluegrass control following zinc applications in bermudagrass. Greenhouse and field studies were conducted during 2009-2011 in Auburn, AL. Zinc sulfate heptahydrate (ZnSO4 · 7H2O) was used as the zinc source, and all Zn rates were applied as a granular treatment. Greenhouse studies were conducted at the Auburn University Plant Science Research Center. Daytime and nighttime temperatures were approximately 20 and 24°C, respectively. Annual bluegrass, roughstalk bluegrass, creeping bentgrass, and perennial ryegrass were grown in separate experiments from seed (50 per pot) in pots containing Marvyn loamy sand. Each experiment was a three by five factorial of pH (5.5, 6.0, 6.5) and Zn rate (0, 34, 67, 101, 134 kg ha-1), arranged in a completely randomized design, replicated four times. Total number of seedlings in each pot was determined every 7 days for 28 days. Field studies were conducted at the Auburn University Turfgrass Research Unit. The study was a randomized complete block design with three replicates, conducted on a non-overseeded bermudagrass putting green. Treatments included four zinc rates (22, 45, 90, 179 kg ha-1), single and multiple applications of fenarimol (2.2 kg ai ha-1), fenarimol + Zn (22 and 90 kg Zn ha-1), and prodiamine (1.1 kg ai ha-1). Fenarimol and prodiamine treatments were applied at 285 L ha-1. Initial treatments were applied in mid-September. Annual bluegrass control was evaluated throughout the fall and winter, and final data included individual plant counts in each plot. Data for both studies was analyzed using Proc GLM in SAS, and means were separated using Fisher's Protected LSD (P=0.05). In the greenhouse study, all applications of Zn reduced germination, regardless of grass species or pH. Only germination of bentgrass was affected by soil pH, with germination of annual bluegrass, roughstalk bluegrass, and perennial ryegrass unaffected by soil pH. At the lowest rate of Zn application (0 kg ha-1) approximately 85% of seed planted germinated for all grass species. At the highest rate of Zn application (134 kg ha-1) less than 55% of the perennial ryegrass, roughstalk bluegrass, and bentgrass seed germinated (28 DAT). Sixty percent of the annual bluegrass seed germinated at the highest Zn rate (134 kg ha-1) (28 DAT). Injury symptoms at all pH levels included stunting and chlorosis, which first appeared in the leaf tips and moved towards the base of the plant. In the field study, zinc applied at 179 kg ha-1 controlled annual bluegrass 80% throughout the season. Prodiamine, which is currently not labeled for putting greens, controlled annual bluegrass 90%, while applications of fenarimol controlled annual bluegrass only 40%. These data indicate that by applying 90-179 kg Zn ha-1, it is possible to greatly reduce annual bluegrass populations."
Language:English
References:0
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Bristow, C. L., J. McElroy, and E. A. Guertal. 2012. Integrating zinc into annual bluegrass control programs in bermudagrass putting greens. South. Weed Sci. Soc. Proc. 65:p. 218.
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http://www.swss.ws/wp-content/uploads/docs/2012 Proceedings-SWSS.pdf#page=290
    Last checked: 08/07/2013
    Requires: PDF Reader
    Notes: Item is within a single large file
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