Full TGIF Record # 74461
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Web URL(s):http://web.archive.org/web/20061205204057/http://www.uoguelph.ca/GTI/itsweb/proceedings.pdf#page=34
    Last checked: 05/23/2017
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Publication Type:
Content Type:Abstract or Summary only
Author(s):Wetzel, H. C. III
Author Affiliation:North Carolina State University
Title:The impact of fertilizers and fungicides on the incidence and severity of bentgrass dead spot
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Meeting Info.:Toronto, Ontario, Canada: 15-21 July, 2001
Source:IXth International Turfgrass Research Conference. Vol. 9, 2001, p. 71.
Publishing Information:[Toronto, Canada]: International Turfgrass Society
# of Pages:1
Keywords:TIC Keywords: Fertilizers; Fungicides; Disease severity; Fall spot of bentgrass; Ophiosphaerella agrostis; Agrostis stolonifera; Golf greens; Golf courses; Nitrogen fertilizers; Chlorothalonil; Nitrogen; Potassium; Avena sativa; Fungicide combinations; Sand-based golf greens
Cultivar Names:Cato
Abstract/Contents:"Bentgrass dead spot (BDS), incited by Ophiosphaerella agrostis Dernoeden, Câmara, O'Neill, van Berkum, & Palm, was documented in 1999 in North Carolina, South Carolina, and Georgia on newly established creeping bentgrass (Agrostis stolonifera L.) putting greens. A study was designed to evaluate the effects of nitrogen source, K2 SO4 , and the curative properties of a 50% chlorothalonil plus 16.7% thiophanatemethyl (16.4 kg ai ha-1 applied on a 7-d interval) fungicide on the incidence and severity of BDS. Turf was a newly established, methyl bromide fumigated, 'Cato' creeping bentgrass sand-based research green. Nitrogen and potassium were applied in a 1:1 ratio to deliver a total of 390 kg ha-1 yr-1 of each element. Point inoculations were made on 16 October 1999 with O. agrostis-colonized oat (Avena sativa L.) grains. Symptoms of BDS were first noted on 24 June 2000. Curative fungicide applications were initiated on 28 June and continued for 5-wk. The K2SO4 had no influence on BDS incidence or severity. Symptoms of BDS failed to develop in (NH4)2SO4 and Country Clubä 16-4-8 (N source consisting of (NH42SO4 & NH4H2PO4) treated, but were pronounced in NaNO3, NH4NO3, and urea (CO(NH2)2)-treated plots. Ratings from 5 July to 1 December demonstrated that BDS incidence and severity (avg. no. & diam. of infection centers per 1.5 m2, respectively) was significantly less in NaNO3 (2 & 17 mm) when compared to NH4NO3 (5 & 36 mm) and urea (4 and 31 mm)-treated plots. Consequently, BDS infection centers in the fungicide treated NaNO3 plots healed 28 days after the initial fungicide treatment (DAIFT) as compared to 35 DAIFT for NH4NO3 and urea-treated plots."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Wetzel, H. C. III. 2001. The impact of fertilizers and fungicides on the incidence and severity of bentgrass dead spot. Int. Turfgrass Res. Conf. 9:p. 71.
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    Last checked: 05/23/2017
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    Notes: Document is within a single large file
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