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| Publication Type:
| Report |
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| Author(s): | DiMarco, J. N.;
Majumdar, P. R.;
Tredway, L. P.;
Towers, G. W.;
Weibel, E. N.;
Clarke, B. B. |
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| Author Affiliation: | Department of Plant Pathology, Rutgers University, New Brunswick, New Jersey |
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| Title: | Evaluation of chemical and biological fungicides for the control of summer patch, 1998 |
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| Source: | Fungicide and Nematicide Tests. Vol. 54, 1999, p. 510-511. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| # of Pages: | 2 |
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| Keywords: | TIC Keywords: Poa pratensis; Summer patch; Magnaporthe poae; Disease control; Chemical control; Biological control; Fungicide evaluation; Disease severity; Application rates; Application frequency; Tank mix
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| Cultivar Names: | Baron |
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| Abstract/Contents: | "Fungicides were evaluated for their ability to control summer patch on Kentucky bluegrass at the Rutgers Turf Research Farm in North Brunswick, NJ. Turf was established Sep 1992 on a Norton loam soil with a pH of 6.4. The site was mowed at 1.5 in., two times per week, and clippings were not collected. Turf was irrigated to prevent drought stress. Fertilizer was applied as 15-0-0 on 8 Apr (0.21 lb N/1000 sq ft) and 22 Apr (0.56 lb N/1000 sq ft), and 16-4-8 on 13 Jul (1.0 lb N/1000 sq ft). The following selective herbicides were applied on 13 Apr to control broadleaf weeds: 2,4-D-4 amine (0.59 fl oz/ 1000 sq ft), Banvel 4L (0.18 fl oz/1000 sq ft), and Dimension 1E (1 fl oz/1000 sq ft). Quinchlorac 75DF (0.25 oz/1000 sq ft) was applied on 9 Jul to control crabgrass. Insects were suppressed with Dursban Pro 2EC on 24 Jul (2 fl oz/1000 sq ft) and on 14 Aug (1.5 fl oz/1000 sq ft). Plots were 3 ft x 9 ft and were arranged in a randomized complete block with four replications. Fungicides were applied in water equivalent to 4 gal per 1000 sq ft with a CO₂ powered sprayer at 30 psi using TeeJet 8003E nozzles. Treatments (trt) 38 and 39 were watered into the thatch after each application with 1 gal water per plot. All treatments were initiated on 29 May when the maximum soil temperature at a 2 inch depth reached or exceeded 65°F for 5 consecutive days. Fungicides were reapplied at the appropriate intervals as indicated in the table. Each plot was inoculated in three locations with 25 cc of oats infested with Magnaporthe poae, isolate 73-15, on 28 May 1998. Percent turf area exhibiting foliar symptoms of summer patch was assessed on 14 Aug, 31 Aug, and 11 Sep. Data were subjected to analysis of variance and means separation by Waller-Duncan k-ratio t test (k=100) following arcsine transformation. Summer patch was first observed on 5 Aug. Disease severity increased steadily through 11 Sep. On 14 Aug, all products except the 21.4 oz rate of QST 1713 W (trt 23), provided a significant level of summer patch suppression. As the disease intensified on 31 Aug, most treatments containing CGA 279'202 50W (trt 6, 7, 9), Banner MAXX 1.24MC (trt 10-15), DAS 0025 (trt 18), Lynx 45W (trt 19), Eagle 40W (trt 21), Companion I (trt 24, 29, 30), and Heritage 50 WG (trt 29-37) continued to provide good to excellent disease control. Excellent season-long control was only obtained, however, with the 4 oz rate of Banner MAXX 1.24MC (trt 13), Banner MAXX 1.24MC + Primo L 1E (trt 15), S-7511 G (trt 39), and Heritage 50WG alone (trt 35-37) and in combination with Companion I (trt 29, 30), Companion LS 238 (trt 31, 32), and Companion LS 239 (trt 33, 43). No phytotoxicity was observed." |
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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):
DiMarco, J. N., P. R. Majumdar, L. P. Tredway, G. W. Towers, E. N. Weibel, and B. B. Clarke. 1999. Evaluation of chemical and biological fungicides for the control of summer patch, 1998. Fungicide Nematicide Tests. 54:p. 510-511. |
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