| |
| Publication Type:
| Report |
|---|
| Author(s): | Wetzel, H. C. III;
Fry, J. D. |
|---|
| Author Affiliation: | Departments of Plant Pathology and Horticulture, Forestry and Recreation Resources, Kansas State University, Manhattan, KS |
|---|
| Title: | Evaluation of fungicides in combination with core aerification on the control of summer patch disease in mystic Kentucky bluegrass, 1997 |
|---|
| Source: | Fungicide and Nematicide Tests. Vol. 53, 1998, p. 459. |
|---|
| Publishing Information: | St. Paul, MN: American Phytopathological Society |
|---|
| # of Pages: | 1 |
|---|
| Keywords: | TIC Keywords: Poa pratensis; Magnaporthe poae; Disease control; Fungicides; Coring; Myclobutanil; Fluazinam; Cyproconazole; Azoxystrobin; Triadimefon; Turfgrass quality
|
|---|
| Abstract/Contents: | "Evaluation of fungicides in combination with core aerification on the control of summer patch disease in mystic Kentucky bluegrass, 1997: Fungicides were applied with a CO₂ pressurized (36 psi) sprayer equipped with three flat-fan (8010) nozzles, and calibrated to deliver 2.2 gal water per 1000 ft². Dates of fungicide application were 28 Apr, 24 May, and 21 Jun 97. The fungicides were not watered-in. Turfgrass plots were aerified 18 Oct 96 and 25 Mar 97 with a Ryan Greensaire equipped with 0.37 in. hollow tines. Aerification cores were verticut and remaining thatch was removed. Turf was a four-year-old stand of Mystic Kentucky bluegrass maintained at a 0.75 in. mowing height, and received 3.0 ob N/1000 ft²/yr. Dimension and Trimec Classic were each applied at the rate of 1.5 fl oz per 1000 ft² on 6 May 97 for preemergence crabgrass and postemergence broadleaf weed control, respectively. Merit 0.5G was applied at the rate of 1.4 lb per 1000 ft² on 28 May 97 for the preventative control of subsurface feeding white grubs. All plots were inoculated at 10 random locations each with 0.18 oz of M. poae-infested oat kernels, consisting of a single M. poae isolate from the experimental area the previous year, to a 2 in. depth with a 0.75 in. diam. soil probe. Soil was a Chase silt loam with a pH of 6.8. The experimental design was a completely randomized block design with four replications and a treatment structure of a split plot with the whole plot (120 ft²) receiving a fungicide and the sub plot (60 ft²) receiving an aerification treatment, respectively. Summer patch disease severity was assessed visually as a percent of plot area blighted by M. poae on a 0 to 100% scale where 0=no blighting and 100=entire plot area blighted. Turfgrass blight ratings exceeding 5.0% would be considered unacceptable control of M. poae. Turfgrass quality was assessed on a 0 to 10 scale, with 0 being completely brown or dead turf; 8 being minimal acceptable quality for golf course fairway turf; and 10 being optimum turf density and greeness. Data were analyzed using the SAS PROC MIXED procedure and significantly different treatment means were separated using the least squares means procedure at the P=0.05 level. Summer patch symptoms were first noted on 28 Jul and reached their greatest expression on 15 Aug due mainly to natural infestations of M. poae. Generally, summer patch disease pressure was light, likely due to minimal rainfall and mild temperatures during the spring. Turfgrass quality ratings reflected disease severity in all treatments. Bayleton-, Eagle-, and Heritage-treated plots exhibited acceptable quality for golf course fairway turf regardless of aerification treatment. Turfgrass quality improved in the Fluazinam-treated plots that were not aerified, but were not significantly different then the control plots. Heritage, Bayleton, and Eagle significantly reduced summer patch symptoms in the aerified plots. Sentinel reduced blighting under and aerified regime, but was associated with an increase in blighting in nonaeridied turf. Fuluazinam was associated with increased blighting relative to other fungicides in aerified plots, but had blight levels similar to all other treatments except Sentinel in nonaerified turf. Control plots that were not aerified had significantly less summer patch compared to aerified control plots, suggesting that disease severity was enhanced under an aerified regime in the absence of a fungicide treatment." |
|---|
| Language: | English |
|---|
| References: | 0 |
|---|
| Note: | Tables |
|---|
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Wetzel, H. C. III, and J. D. Fry. 1998. Evaluation of fungicides in combination with core aerification on the control of summer patch disease in mystic Kentucky bluegrass, 1997. Fungicide Nematicide Tests. 53:p. 459. |
| Fastlink to access this record outside TGIF: https://tic.msu.edu/tgif/flink?recno=55677 |
| If there are problems with this record, send us feedback about record 55677. |
| 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) |
