| |
| Publication Type:
| Report |
|---|
| Author(s): | Dernoeden, P. H.;
Krouse, J. M. |
|---|
| Author Affiliation: | Dept. of Agronomy, Univ. of Maryland |
|---|
| Title: | Dollar spot and brown patch control in a bentgrass putting green |
|---|
| Source: | Fungicide and Nematicide Tests. Vol. 45, 1990, p. 268. |
|---|
| Publishing Information: | St. Paul, MN: American Phytopathological Society |
|---|
| Keywords: | TIC Keywords: Agrostis stolonifera; Dollar Spot; Brown patch; Fungicide evaluation; Propiconazole; Flutolanil
|
|---|
| Abstract/Contents: | "Fungicides were applied to creeping bentgrass maintained under putting green conditions. Soil was a loamy sand with a pH of 6.5 and 3.0% OM. Some dollar spot, but no brown patch, was active when the test was initiated on 9 May. Rain began within 4 hrs of treatment on 9 May and rain showers persisted for 72 hrs. No rain occurred within 24 hrs of any other spray date. Fungicides were applied on two spray intervals, at the rates and dates shown in the data table, with a CO2 pressurized (38 psi) sprayer in 2.5 gal. water per 1000 ft2. Plots were 5 by 5 ft and arranged in a randomized complete block with four replications. Percent of plot area diseased was visually determined on a 0 to 100% scale. Dollar spot ratings exceeding 0.5%, and brown patch ratings exceeding 2.0% would be considered unacceptable control for putting greens. Dollar spot pressure was low from May to mid-Jul, becoming moderately severe in late Jul. Brown patch was extremely severe from mid-July to early Jul, but pressure subsided to a moderately severe level in mid to late Jul. From May to 19 Jun (not all data shown) all fungicide treatments were generally providing good to excellent dollar spot control. By 10 Jul, 21 days after last applied, Ro-40-6637 (0.4 oz.) and flutolanil + Rubigan had lost their residual effectiveness and dollar spot levels were unacceptable. By 24 Jul, turf sprayed with the aforementioned treatments, as well as the high rate of Ro-40-6637, were the only fungicides not providing acceptable residual dollar spot control. All fungicides provided acceptable brown patch control when the disease initially appeared on 19 Jun. Brown patch became extremely severe during the 28 Jun to 3 Jul period, at which time acceptable control was provided by Ro-40-6637 (1.2 oz.), SN 84364, SAN 832, SAN 619 (0.25 oz. on 28 Jun) and all treatments containing flutolanil. While Banner, SAN 619 (0.17 oz.) and Ro-40-6637 (0.4 oz.) provided a significant reduction in brown patch on most rating dates, they did not provide an acceptable level of residual control from 28 Jun to 24 Jul. Treatments containing flutolanil and SN 84364 were last applied 19 Jun, but continued to provide outstanding brown patch control on 17 and 24 Jul. Similarly, SAN 832 (both rates) and SAN 619 (0.25 oz.), which were last applied 3 Jul, also continued to provide excellent brown patch control on 17 and 24 Jul." |
|---|
| Language: | English |
|---|
| References: | 0 |
|---|
| Note: | Tables |
|---|
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Dernoeden, P. H., and J. M. Krouse. 1990. Dollar spot and brown patch control in a bentgrass putting green. Fungicide Nematicide Tests. 45:p. 268. |
| Fastlink to access this record outside TGIF: https://tic.msu.edu/tgif/flink?recno=18161 |
| If there are problems with this record, send us feedback about record 18161. |
| Choices for finding the above item: |
|---|
| 
MSU catalog number: SB 951.3 .F82 |
| Request through your local library's inter-library loan service (bring or send a copy of this TGIF record) |
