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| Web URL(s): | https://www.plantmanagementnetwork.org/pub/trial/pdmr/reports/2013/T017.pdf
Last checked: 11/14/2016
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| Publication Type:
| Report |
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| Author(s): | Popko, J.;
Jung, G. |
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| Author Affiliation: | Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA |
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| Title: | Preventative control of dollar spot caused by a population of Sclerotinia homoeocarpa isolates exhibiting dual fungicide resistance, 2012 |
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| Section: | Turfgrass
Other records with the "Turfgrass" Section
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| Source: | PDMR: Plant Disease Management Reports. Vol. 7, 2013, p. T017. |
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| Publishing Information: | St. Paul, Minnesota: American Phytopathological Society |
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| # of Pages: | 2 |
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| Related Web URL: | http://www.plantmanagementnetwork.org/pub/trial/PDMR/volume7/abstracts/T017.asp
Last checked: 04/01/2013
Access conditions: Document is within a limited-access website
Notes: Summary only |
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| Keywords: | TIC Keywords: Agrostis stolonifera; Agrostis tenuis; Chemical sensitivity; Cultivar evaluation; Cultural methods; Dollar spot; Fungicide efficacy; Penthiopyrad; Poa annua; Thiophanate-methyl; Vinclozolin
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| Trade Names: | Velista; Curalan |
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| Abstract/Contents: | "This field trial was conducted at Hickory Ridge Golf Club, in Amherst MA to evaluate fungicide treatments for control of dollar spot under natural disease conditions. The plot consisted of creeping bentgrass (cultivar: Seaside and unknown cultivars), colonial bentgrass and annual bluegrass fairway on a native soil (Boxford silt loam) that was established in 1965. Mowing was performed 2-3 times per week (0.50-inch cutting height). Irrigation was applied as needed to prevent drought stress. 19-0-19 fertilizer was applied at a rate of 0.5 lb nitrogen (N)/1,000 ft2) on 12 Jun. The plant growth regulator GoldwingTM was applied at a rate of 0.25 fl oz/1,000 ft2 on 15 Jun. The herbicide Drive XLR8 1.5ME was applied at a rate of 0.5 fl oz/1,000 ft2 on 15 Jun. Individual plots measured 3 ft x 6 ft with a 1-ft buffer strip and were arranged in a randomized complete block design with four replications. All treatments were applied preventatively and were initiated on 16 May and continued through 8 Aug. All individual treatments were applied at a nozzle pressure of 40 psi using a CO2-pressurized boom sprayer equipped with two XR TeeJet 8004VS nozzles in the equivalent of 2 gallons of water per 1,000 ft2. Weekly ratings for dollar spot were made by counting individual infection centers. All dollar spot assessments were subject to an analysis of variance and means were separated using Fisher's LSD test (P < 0.05). Individual leaf blades from dollar spot infection centers were sampled (five per replication) within the untreated on 25 May. In total, S. Homoeocarpa was isolated from 11 of the 20 leaf blades. Discriminatory concentrations that determine fungicide sensitivity to both propiconazole (1 ppm) and thiophanate-methyl (1,000 ppm) qualitatively were chosen to assess insensitivity/resistance. Of the 11 isolates assayed, 9 out of the 11 were confirmed to be DMI insensitive and 9 out of the 11 were benzimidazole resistant. Moreover, prior DMI field efficacy testing (Popko et al., 2012, Plant Dis. 96:552-561) confirmed reduced efficacy in comparison to a local baseline site. Moderate to high dollar pressure was observed from mid-May through June and also in August. Rainfall was below average in July and dry conditions led to reduced dollar spot pressure in the middle of the trial. All treatments yielded statistically better control than the untreated on all rating dates. Most treatments provided acceptable control throughout the trial with a few exceptions. Quali-Pro TM was the least effective fungicide, however, the presence of thiophanate-methyl resistant isolates explains this result. The lower rate of Velista was statistically similar to Quali-Pro TM and did not adequately control dollar spot. However, the higher rate of Velista tank-mixed with Curalan (1.0 oz/1,000 ft2) performed very well. Secure + A9898A was the top performer numerically based on AUDPC. All treatments that included QP Enclave controlled dollar spot very well. Overall, Secure (applied alone) and tank mix treatments with either A9898A or Banner MAXX controlled dollar spot very well throughout the trial. Phytotoxicity was not observed during the course of the study." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is as abstract and tables only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Popko, J., and G. Jung. 2013. Preventative control of dollar spot caused by a population of Sclerotinia homoeocarpa isolates exhibiting dual fungicide resistance, 2012. PDMR: Plant Dis. Manage. Rep. 7:p. T017. |
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| Web URL(s):
https://www.plantmanagementnetwork.org/pub/trial/pdmr/reports/2013/T017.pdf
Last checked: 11/14/2016
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
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