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| Web URL(s): | http://www.plantmanagementnetwork.org/pub/trial/pdmr/volume3/abstracts/t36.asp
Last checked: 09/21/2009
Notes: Report Summary
https://www.plantmanagementnetwork.org/pub/trial/pdmr/reports/2009/T036.pdf
Last checked: 02/21/2017
Requires: PDF Reader |
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| Publication Type:
| Report |
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| Author(s): | Soika, M. D.;
Tredway, L. P. |
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| Author Affiliation: | Department of Plant Pathology, North Carolina State University, Raleigh, North Carolina |
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| Title: | Control of summer patch of Kentucky bluegrass with fungicides in Raleigh, NC, 2008 |
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| Source: | PDMR: Plant Disease Management Reports. Vol. 3, 2009, p. T036. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Disease control; Fungicide efficacy; Fungicide evaluation; Magnaporthe poae; Poa pratensis; Summer patch
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| Cultivar Names: | Unique |
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| Abstract/Contents: | "Fungicides were evaluated for preventative control of summer patch caused by Magnaporthe poae. This trial was conducted at the Lake Wheeler Turfgrass Field Laboratory in Raleigh, NC on 'Unique' Kentucky bluegrass under conditions to mimic an intensely managed landscape. Mowing was performed three times weekly through 25 Jul and once weekly after 25 Jul at a height of 3.5 in. with clippings returned. The site was irrigated with 0.13 in. water daily at 8:00 hr and 20:00 hr to provide environmental conditions conducive to disease development. Fertilizer was applied as 30-6-10 on 14 Feb (1.0 lb nitrogen (N)/1,000 sq ft). Barricade 65WG was applied at 0.5 lb ai/A on 12 Feb for control of annual grasses. Subdue MAXX (1.0 fl oz/1,000 sq ft) was applied on 5 Jun, 25 Jun, and 24 Jul for control of Pythium foliar blight. Plots were 3.33 ft x 10 ft and were arranged in a randomized complete block with four replications. Each plot was inoculated in summer 2006 by removing three cup-cutter plugs to 2-in. depth and placing 10 cm3 of rye grain infested with M. Poae in the bottom of each hole before replacing the turf plug. No fungicides were applied to the area and no summer patch symptoms were observed during 2007. Treatments were initiated on 2 May 2008 and reapplied at the appropriate intervals as indicated in the table. Fungicides were applied in water equivalent to 2 gal per 1,000 sq ft with a CO2-powered sprayer at 40 psi using a TeeJet 9508E nozzle. The study was irrigated with 0.26 in. water within 12 hr of each application. The diameter (inches) and severity of each of the three patches in each plot was assessed on 10 Sep. Disease severity assessments for individual patches were based on a 0 to 5 scale where 0=no necrosis, and 5=all plants within patch necrotic. A disease index was calculated for each plot by multiplying the average patch diameter value by the average disease severity value. Data were subjected to analysis of variance and means separation by Waller-Duncan k-ratio t test (k=100). In the second year after inoculation with M. Poae, the average diameter of patches in untreated plots was 5.5 inches. Summer patch severity was moderate during 2008, with untreated plots receiving an average rating of 2.5 on a scale of 0 to 5. Only Armada significantly reduced patch diameter, but Banner MAXX, Heritage, and Bayleton also maintained average patch diameter below 1 in. All treatments except Compass and Headway significantly reduced disease severity as compared to untreated plots. Except for Compass and Headway, all treatments suppressed summer patch severity compared to the untreated control. Patch diameters in plots treated with Bayleton were significantly lower compared to the untreated control. According to the disease index, which takes patch diameter and severity into account, excellent summer patch control was provided by Banner MAXX, Heritage, Armada, and Bayleton. Eagle and Trinity provided an intermediate level of control, whereas GF-1948, Insignia, Compass, and Headway failed to provide significant control." |
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| Language: | English |
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| References: | 0 |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Soika, M. D., and L. P. Tredway. 2009. Control of summer patch of Kentucky bluegrass with fungicides in Raleigh, NC, 2008. PDMR: Plant Dis. Manage. Rep. 3:p. T036. |
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| Web URL(s):
http://www.plantmanagementnetwork.org/pub/trial/pdmr/volume3/abstracts/t36.asp
Last checked: 09/21/2009
Notes: Report Summary
https://www.plantmanagementnetwork.org/pub/trial/pdmr/reports/2009/T036.pdf
Last checked: 02/21/2017
Requires: PDF Reader |
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