| |
| Web URL(s): | https://www.plantmanagementnetwork.org/pub/trial/fntests/reports/2000/55-529.pdf
Last checked: 05/04/2017
Requires: PDF Reader |
|---|
| Publication Type:
| Report |
|---|
| Author(s): | Vincelli, P.;
Dixon, E.;
Williams, D. |
|---|
| Author Affiliation: | Vincelli and Dixon: Department of Plant Pathology; and Williams: Department of Agronomy, University of Kentucky, Lexington, KY |
|---|
| Title: | Efficacy of fungicides for control of gray leaf spot of perennial ryegrass, 1999 |
|---|
| Section: | Turf grass reports
Other records with the "Turf grass reports" Section
|
|---|
| Source: | Fungicide and Nematicide Tests. Vol. 55, 2000, p. 529-530. |
|---|
| Publishing Information: | St. Paul, MN: American Phytopathological Society |
|---|
| # of Pages: | 2 |
|---|
| Keywords: | TIC Keywords: Application rates; Disease severity; Lolium perenne; Gray leaf spot; Pyricularia grisea; Fungicides; Fungicide evaluation; Fungicide combinations; Disease control; Dry conditions; Etiology; Symptoms; Golf fairways
|
|---|
| Abstract/Contents: | "The test was conducted on a Maury silt loam located at the University of Kentucky Turf Center near Lexington. The turf was maintained at a 0.75 in. mowing height, irrigated as needed, and fertilized with 1.5 lb N as urea on 26 Oct 98 and 24 Nov 98. The area also received 1.5 lb 2,4D with 0.25 lb Dicamba and Barricade for summer annual grass control. Plots measured 3 ft X 3 ft with 2 ft borders, and were arranged in a randomized complete block design with three replications. Inoculum was prepared by soaking equal parts of oats and barley in water overnight, autoclaving for 1 hr on 2 consecutive days, inoculating prepared by soaking equal parts of oats and barley in water overnight, autoclaving for 1 hr on 2 consecutive days, inoculating with a local isolate of P. grisea and incubating at room temperature for 2 wk; flasks were shaken to mix the inoculum after the first week of growth. The site was inoculated by hand-dispensing 270 g inoculum per plot on 22 Jul. A second inoculation was done on 19 Aug by spraying 2.5 ml of a 4 x 10ā“/ml spore suspension per plot. Fungicide sprays were applied using a COā-pressurized hand-held sprayer fitted with Spray Systems 8003E flat-fan nozzles delivering 2.5 gal/1000 sq ft. All treatments were first applied on 20 Jul; remaining sprays were applied according to the schedules indicated in the table. The exception to the spray schedule, Dimension herbicide, was sprayed only once on 29 Jun. Visual estimates of percent plot surface affected by gray leaf spot were obtained weekly. All data were analyzed using ANOVA and Waller-Duncan's k-ratio t-test, (k=100, P=0.05). Arithmetic means are presented with rankings from arcsine-transformed data. Weather conditions throughout the trial period were dry, and relative humidity failed to reach 95% on most nights. Hot weather followed the 20 Jul inoculations, with the high temperature reaching 104 F on 30 Jul; along with the dry weather, this may have slowed development of gray leaf spot. The trial was irrigated as needed to prevent drought stress. Following inoculation, cursory inspections of the trial area revealed little to no disease activity. On 19-20 Aug, severe leaf blighting was noted in many plots, most or all of which had developed since 17 Aug. Two general symptom types were noted in the trial: a general, diffuse foliar blighting due to infections on leaf blades and sheaths; and patches of dead tillers, possibly due to infections near the soil line. Repeated observations were made to confirm the etiology of both symptom types. This distinction in symptom type is important because, while both occurred in some of the treatments (such as the water control), certain plots exhibited only one or the other symptom type. It is unknown whether such differences among treatments relate to deposition or redistribution properties of the treatments applied. However, it is considered significant that, in certain treatments, relatively small plot areas were affected by gray leaf spot yet much or all of the affected area was comprised of dead tillers. Disease progress was essentially halted following the explosive epidemic that occurred during the period 17-20 Aug; no significant change was observed in the mean disease level in water-treated control plots through 15 Sep. No phytotoxicity or growth-regulator effect was observed in the trial." |
|---|
| Language: | English |
|---|
| References: | 0 |
|---|
| Note: | Tables |
|---|
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Vincelli, P., E. Dixon, and D. Williams. 2000. Efficacy of fungicides for control of gray leaf spot of perennial ryegrass, 1999. Fungicide Nematicide Tests. 55:p. 529-530. |
| Fastlink to access this record outside TGIF: https://tic.msu.edu/tgif/flink?recno=70141 |
| If there are problems with this record, send us feedback about record 70141. |
| Choices for finding the above item: |
|---|
| Web URL(s):
https://www.plantmanagementnetwork.org/pub/trial/fntests/reports/2000/55-529.pdf
Last checked: 05/04/2017
Requires: PDF Reader |
| 
MSU catalog number: SB 951.3 .F82 |
| Find from within TIC:
Digitally in TIC by record number. |
| Request through your local library's inter-library loan service (bring or send a copy of this TGIF record) |
