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| Publication Type:
| Report |
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| Author(s): | Clarke, Bruce B. |
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| Author Affiliation: | Department of Plant Pathology, Cook College, Rutgers University |
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| Title: | Preventative Control of Stripe Rust in Kentucky Bluegrass, 1987 |
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| Source: | Fungicide and Nematicide Tests. Vol. 43, 1988, p. 269. |
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| Publishing Information: | St. Paul: American Phytopathological Society |
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| Keywords: | TIC Keywords: Poa pratensis; Ustilago striiformis; Puccinia striiformis; Phytotoxicity
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| Abstract/Contents: | "Fungicides were evaluated at the Rutgers Turf Research Farm in Adelphia, NJ for their ability to control stripe rust (Puccinia striiformis) on 'Merion' Kentucky bluegrass. Seed was sown in a sandy loam soil on 13 Sep 80. Turf received 1.6 lb actual N (10-6-4)/1000 sq ft in 1986 and 0.8 lb actual N (10-6-4)/1000 sq ft on 15 May 87. Cutting height was maintained at 2.5 in. until 28 Aug, 1987 at which time plots were left unmowed to encourage disease development. Soil pH ranged from 6.0 - 6.2 over the test area. Plots were 3 ft x 9 ft and treatments were replicated four times on a randomized block design. Turf was irrigated as needed to avoid water stress. Dacthal 75W (14 lb/A) and 2,4-D amine (2.5 pt/A) were applied in Oct 1986 to prevent weeds. Fungicides were applied on 28 Aug, 9 Sep and 8 Oct 87 with a carbon dioxide compressed air sprayer, T-jet nozzle 8003 E, adjusted to 30 psi, in water equivalent to 1.9 gal/1000 sq ft. Plots were visually evaluated for percent turf area infected on 17, 25 Sep, 3, 11, 21, 30 Oct, 7 and 19 Nov 87 using a modified Forsefall-Barrett log scale. Data was subjected to an arc-sin transformation prior to statistical analysis. A table relating the percent area infected to the treaments and rates used is included. Stripe Rust, first observed and confirmed on 7 Sep, was not evenly distributed throughout the test area until 17 Sep. All fungicide treatments provided good to excellent control of stripe rust during the preventative application period (28 Aug - 8 Oct) except RH-7592 0.5E (both rates) and Rizolex 75WDG (4.3 oz). As disease severity increased, RH-3486 (2.0 oz) and the remaining Rizolex 75 WDG treatments also lost effectiveness. Residual activity was excellent (+ 41 days) for SAN 619 40WG (all rates), Systhane 40W (8.8 g) affording comlete control throughout the study. Nustar 20DF (0.75 oz), Apache 50W (allrates), Systhane 40W (0.12 oz) and Nustar 20DF + DPX-965 50DF also provided long-lasting residual control (29-41 days). Phytotoxicity, apparent as a slight foliar tip necrosis, was noticeable on all plots treated with SAN 619 40WG (8.8 g). Damage however, was only detected on 21 Oct and turf completely recovered within 5-7 days." |
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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):
Clarke, B. B. 1988. Preventative Control of Stripe Rust in Kentucky Bluegrass, 1987. Fungicide Nematicide Tests. 43:p. 269. |
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MSU catalog number: SB 951.3 .F82 |
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