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| Publication Type:
| Report |
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| Author(s): | Fresenburg, B. S.;
Corwin, B. S.;
Ervin, E. H. |
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| Author Affiliation: | Plant Sciences Unit, University of Missouri, Columbia, MO |
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| Title: | Evaluation of fungicides for management of dollar spot on bentgrass greens, 1998 |
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| Source: | Fungicide and Nematicide Tests. Vol. 54, 1999, p. 490. |
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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: Agrostis stolonifera; Disease control; Dollar spot; Sclerotinia homoeocarpa; Fungicide evaluation; Application rates; Disease severity; Quality; Algae; Azoxystrobin; Chlorothalonil; Iprodione; Triadimefon; Penconazole; Propiconazole; Myclobutanil; Tank mix
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| Cultivar Names: | Penncross |
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| Abstract/Contents: | "The study was conducted on a 'Penncross' bentgrass green at the Turf Research Center, University of Missouri at Columbia, Missouri. The green profile is a 12-inch base of 90% sand and 10% peat over drains and pea gravel. The 'Penncross' was established in the fall of 1992. The green was mowed on Monday, Wednesday, and Friday of every of week at 0.156 inches. Fertility levels were maintained at a high level with 0.38 lbs of nitrogen per 1000 square feet applied every three weeks. Moisture levels were maintained at optimum levels with thorough, but infrequent, watering plus daily syringes as needed to keep surface temperature down. Weather conditions favored an extended dollar spot season starting in May and continuing into Jul. Night time temperatures remained cool with heavy dew to prolong the infection period. Dollar spot pressure was moderate to high. Fungicide treatments were initiated 12 May and sequentially applied on 26 May, 9 Jun and 23 Jun based on the recommended application interval for each treatment. Plots were 5 ft x 5 ft replicated 4 times in a randomized complete block. Treatments were applied with a CO₂ backpack sprayer, walking speed of 3 mph, using TeeJet XR8008 tips delivering 56 gpa at 20 psi. Dollar spot was already present on 12 May with the first application of fungicides. Evaluations for quality and % infection were taken on 26 May, 9 Jun and 7 Jul. Quality was taken on a scale of 1 to 9 with 9 equal to the best. Percent infection was taken on a scale of 0 to 100 equal to complete coverage of the host plot by the disease. The presence of algae was evaluated on 7 Jul with 0 equal to none and 1 equal to algae present. All treatments gave significantly better quality and control of dollar spot than the control plot on 26 May with the exception of Lynx. By the Jun and Jul evaluations, all treatments were excellent for quality and control of dollar spot. All treatments with Daconil Weatherstik or Ultrex used as a sole treatment or in a tank mix had no algae present. Where Daconil Ultrex was alternated with Eagle as the primary fingicide, algae was present. |
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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):
Fresenburg, B. S., B. S. Corwin, and E. H. Ervin. 1999. Evaluation of fungicides for management of dollar spot on bentgrass greens, 1998. Fungicide Nematicide Tests. 54:p. 490. |
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MSU catalog number: SB 951.3 .F82 |
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