2007 Evaluation of Fungicides and Fungicide Programs for the Control of Anthracnose on Annual Bluegrass Putting Greens
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1 2007 Evaluation of Fungicides and Fungicide Programs for the Control of Anthracnose on Annual Bluegrass Putting Greens Brian McDonald, Research Assistant Tom Cook, Associate Professor Oregon State University Final Report Introduction The purpose of this trial was to evaluate the effectiveness of various fungicides and fungicide programs in controlling anthracnose (Colletotrichum cereale) on annual bluegrass putting greens. Materials and Methods The trial was initiated on June 26 th on an annual bluegrass putting green located at Emerald Valley Golf Club in Cresswell, Oregon. Subsequent fungicide applications were applied every 3 weeks on July 18 th, August 8 th, August 29 th, and September 19 th. The site is used daily as a chipping green with the first rep located on a sand base and the last two reps on a soil base. The course has a history of anthracnose problems with documented strobilurin and thiophanate methyl resistance (2006 analysis at Turf Pathology Laboratory at University of California at Riverside). Individual plots measured 25 sq ft (5 X 5). Products were applied with a CO2-powered sprayer using TeeJet nozzles at 30 psi producing a total spray volume of two gallons per 1,000 square feet. Treatments are listed in table 1. The green was mowed daily at inches using a triplex greens mower. Before the trial started, the green had been fertilized on a biweekly schedule of 0.25 lbs nitrogen per 1,000 square feet. After initiation of the trial, fertilizer was withheld until the first week of August. Biweekly fertilizer applications were resumed at that time. Irrigation was applied with a RainBird irrigation system with supplemental hand watering. Light sand topdressing was applied on a biweekly basis. Percent disease and plot quality ratings were made on all fungicide application dates plus a final rating on October 1. Data from each rating date were subjected to analysis of variance using a randomized complete block design with 3 replications. Differences between means were determined by LSD at the 5% level.
2 Results Disease symptoms were first observed in mid-july. By August 8 th, the untreated check plots averaged 9.3 percent disease, and by October 1 st, the untreated plots averaged nearly 32% disease coverage. Disease ratings are presented in table 1 and figure 1 shows several treatments with variable amounts of disease. Seven treatments had 0.4% or less disease: # oz # oz # oz # oz # 18 Signature oz oz # oz rotated with Signature and Daconil 4.0 oz oz # oz in June, Signature plus Daconil 4.0 oz oz in July and August, and Lynx 1.5 oz in September. Three of the above treatments had no disease - the two Lynx treatments and the treatment with Lynx rotated with Signature and Daconil. Two treatments had less than 1% disease: # 13 Instrata (propiconazole, chlorothalanil, and 6.0 oz # oz The disease level in the above two treatments would be tolerable to some superintendents but the turf quality was in the low 6 range compared with the first seven treatments that had turf quality generally in the 7.0 to 8.0 range. Instrata at the 6 oz rate produced excellent turf quality in the middle of the trial (8/29) which rated 8.0, but the quality declined to 6.3 by October 1 st. Trinity had turf quality ratings of 6.8 and 7.0 on August 29 th and September 18 th, respectively. Both of these treatments would be effective in a fungicide rotation program. Two treatments had less than 2 % disease: # oz # oz Disease control of these treatments was better than the untreated check plots, but this level of disease would be unacceptable at most golf clubs. Two treatments had 3.3 to 4.3 % disease on Oct 1: # 2 A7402 at the 0.16 oz # 11 Concert (propiconazole and 6.0 oz This level of disease would be generally unacceptable. Concert actually held up well through August (0.9 percent disease on August 29 th ) before faltering in the latter part of the trial.
3 Treatments with more than 6 % disease: # 6 Banner 0.5 oz # 7 Banner 1.0 oz # 8 Banner 1.5 oz # oz # oz # 17 Signature + Daconil 4.0 oz oz All of these treatments produced unacceptable Anthracnose control throughout the trial. Banner Maxx, which has been a key product for Anthracnose control gave surprisingly poor control. We believe this was due to the low rates used in the trial and is not likely an indication of resistance to this fungicide. Minimum rates of Banner Maxx should probably be 2 oz or higher to ensure control. Turf Quality Ratings High turf quality ratings correlated very closely with low percent disease ratings (tables 1 & 2). Top treatments rated 7 or higher by the end of the trial, while the untreated check plots averaged a woeful 2.7. For organization purposes, we have broken turf quality ratings into three tiers: excellent or very good turf quality, acceptable, and unacceptable. Excellent to very good turf quality (7 or higher): # 16 2 oz # oz rotated with Signature & Daconil 4 oz oz # oz # 18 4 oz + 1 oz oz # oz # oz in June, Signature oz oz in July & August, and 1.5 ounces in September Acceptable turf quality (5.8 to 6.7): # # oz # oz # oz # oz Unacceptable turf quality (5.0 or lower). # 1 Untreated check # oz # 6 Banner 0.5 oz # 7 Banner 1.0 oz # 8 Banner 1.5 oz # oz # oz # oz # 17 Signature + Daconil 4.0 oz oz
4 Poor turf quality in these plots reflects poor disease control and may be exaggerated by the low nitrogen fertility levels maintained during the trial. Once fertilizer applications were resumed plot quality did improve in all plots. Table 1: Anthracnose disease ratings % Disease Coverage 7/18 8/8 8/29 9/18 10/1 Trt # Treatment Rates/1,000sq ft Avg Avg Avg Avg Avg 1 Check na FL oz A FL oz A FL oz A FL oz A FL oz Banner Maxx 1.3 ME 0.5 FL oz Banner Maxx 1.3 ME 1.0 FL oz Banner Maxx 1.3 ME 1.5 FL oz A FL oz A FL oz Concert 6.0 FL oz Instrata 4.5 FL oz Instrata 6.0 FL oz Trinity 1.0 FL oz Lynx 1.5 FL oz Lynx 2.0 FL oz Signature + Daconil WT oz Signature + Lynx WT /Liq oz Lynx rotated with Signature + Daconil 1.5/ oz Lynx in June/Sig + Dac in July & Aug/Lynx in Sept 1.5/ oz
5 Table 2: Plot Quality: 1 9; 9 = best Plot Quality 7/18 8/8 8/29 9/18 10/1 Trt # Treatment Rates/1,000 sq ft Avg Avg Avg Avg Avg 1 Check na FL oz A FL oz A FL oz A FL oz A FL oz Banner Maxx 1.3 ME 0.5 FL oz Banner Maxx 1.3 ME 1.0 FL oz Banner Maxx 1.3 ME 1.5 FL oz A FL oz A FL oz Concert 6.0 FL oz Instrata 4.5 FL oz Instrata 6.0 FL oz Trinity 1.0 FL oz Lynx 1.5 FL oz Lynx 2.0 FL oz Signature + Daconil WT oz WT /Liq Signature + Lynx oz Lynx rotated with Signature + Daconil 1.5/ oz Lynx in June/Sig + Dac in July & Aug/Lynx in Sept 1.5/ oz
6 Figure 1: Relative disease activity from selected treatments Untreated plot infected with anthracnose Lynx 2 oz/1,000 sq. ft. 32 % disease 0 % disease Signature (4 oz/m) + Daconil Ultrex (3.2 oz/m) Instrata 6 oz/1,000 sq. ft. 6.7 % disease 0.8 % disease
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