Ferrous Sulfate Suppressed Dollar Spot on Creeping Bentgrass

CSA News ◽  
2021 ◽  
Keyword(s):  
Ferrous Sulfate ◽  
Creeping Bentgrass ◽  
Dollar Spot

scholarly journals Strategies for increasing ferrous sulfate efficacy against dollar spot of creeping bentgrass

itsrj ◽  
2021 ◽  
Author(s):  
Wendell J. Hutchens ◽  
Travis L. Roberson ◽  
Camden D. Shelton ◽  
Shawn D. Askew ◽  
David S. McCall
Keyword(s):  
Ferrous Sulfate ◽  
Creeping Bentgrass ◽  
Dollar Spot

Control of Silvery-Thread Moss (Bryum argenteum Hedw.) in Creeping Bentgrass (Agrostis palustris Huds.) Putting Greens

2004 ◽  
Vol 18 (3) ◽  
pp. 560-565 ◽  
Author(s):  
Keith D. Burnell ◽  
Fred H. Yelverton ◽  
Joseph C. Neal ◽  
Travis W. Gannon ◽  
J. Scott McElroy
Keyword(s):  
Ferrous Sulfate ◽  
Field Experiments ◽  
Creeping Bentgrass ◽  
Nitrogen Fertilizers ◽  
Agrostis Palustris ◽  
Putting Greens ◽  
Rainfall Events ◽  
Population Reduction ◽  
Elk River ◽  
Turfgrass Quality

Field experiments were conducted to evaluate chemicals for silvery-thread moss control and bentgrass turfgrass quality. Treatments included iron (Fe)-containing products, nitrogen fertilizers, Ultra Dawn dishwashing detergent (UD) at 3% (v/v), and oxadiazon. In general, greater silvery-thread moss control was achieved with Fe-containing products. Ferrous sulfate at 40 kg Fe/ha plus ammonium sulfate at 30 kg N/ha, a combined product of ferrous oxide, ferrous sulfate, and iron humates (FEOSH) at 125 kg Fe/ha, and a combined product of iron disulfide and ferrous sulfate (FEDS) at 112 kg Fe/ha reduced silvery-thread moss populations 87, 81, and 69%, respectively, 6 wk after initial treatment (WAIT). UD reduced silvery-thread moss populations 57% 6 WAIT. The addition of oxadiazon to Fe-containing treatments did not improve silvery-thread moss population reduction. Other experiments evaluated two formulations of chlorothalonil, each applied at two rates, chlorothalonil with zinc at 9.5 and 17.4 kg ai/ha and chlorothalonil without zinc at 9.1 and 18.2 kg/ ha, and two spray volumes (2,038 and 4,076 L/ha). Greater silvery-thread moss population reduction was observed at Jefferson Landing in 1999 compared with Elk River in 1999 and 2000. Rainfall events at Elk River in 1999 and 2000 within 24 h after application and no rain at Jefferson Landing may account for variation in performance of products between sites. However, no difference in chlorothalonil formulation, rate, or spray volume was observed in any location or year. These data indicate that Fe-containing fertilizers or chlorothalonil can be used to reduce silvery-thread moss populations in creeping bentgrass putting greens.

Influence of Ferrous Sulfate and Its Elemental Components on Dollar Spot Suppression

Crop Science ◽  
2016 ◽  
Vol 57 (2) ◽  
pp. 581-586 ◽  
Author(s):  
David S. McCall ◽  
Erik H. Ervin ◽  
Camden D. Shelton ◽  
Nathaniel Reams ◽  
Shawn D. Askew
Keyword(s):  
Ferrous Sulfate ◽  
Dollar Spot

scholarly journals Residual Efficacy of Fungicides for Control of Dollar Spot on Creeping Bentgrass

Plant Disease ◽  
2006 ◽  
Vol 90 (5) ◽  
pp. 571-575 ◽  
Author(s):  
Richard Latin
Keyword(s):  
Creeping Bentgrass ◽  
Effective Concentration ◽  
Disease Suppression ◽  
Golf Course ◽  
Sclerotinia Homoeocarpa ◽  
Dollar Spot ◽  
Residual Efficacy ◽  
Bioassay Technique ◽  
Precipitous Decline ◽  
Field Plots

The duration of effective concentrations of fungicides for control of dollar spot on creeping bentgrass fairways was investigated using a bioassay technique. In each of three runs of the experiment, fungicide treatments were applied once to turf in replicated field plots; then, the plots were sampled periodically over 3 weeks by removing turf plugs from the field. The sampled plugs were placed in incubation containers and inoculated with sections from a 4-day-old colony of Sclerotinia homoeocarpa growing on potato dextrose agar. After a 96-h incubation period, the extent of pathogen growth on the turf plugs was measured. Results described a precipitous decline in effective concentration for all fungicide treatments beginning 7 to 10 days after application. The fungicides were only marginally effective at 14 days after application, and none provided any disease suppression at 21 days after application. The efficacy half-life (EHL) associated with four of the fungicides (chlorothalonil, iprodione, propiconazole, and thiophanate methyl) was estimated with two models. EHL estimates ranged from 6.1 to 15.2 days depending on the fungicide and the model. This research contributes to our knowledge of the duration of effective fungicide concentrations on creeping bentgrass and can provide insight for scheduling fungicide sprays for golf course fairways.

Geostatistical Analysis of Dollar Spot Epidemics Occurring on a Mixed Sward of Creeping Bentgrass and Annual Bluegrass

Crop Science ◽  
2007 ◽  
Vol 47 (3) ◽  
pp. 1206-1216 ◽  
Author(s):  
B. J. Horvath ◽  
A. N. Kravchenko ◽  
G. P. Robertson ◽  
J. M. Vargas
Keyword(s):  
Creeping Bentgrass ◽  
Geostatistical Analysis ◽  
Dollar Spot ◽  
Annual Bluegrass

scholarly journals Genetic Diversity of Sclerotinia homoeocarpa Isolates from Turfgrasses from Various Regions in North America

Plant Disease ◽  
2004 ◽  
Vol 88 (11) ◽  
pp. 1269-1276 ◽  
Author(s):  
G. Viji ◽  
W. Uddin ◽  
N. R. O'Neill ◽  
S. Mischke ◽  
J. A. Saunders
Keyword(s):  
United States ◽  
Genetic Diversity ◽  
Creeping Bentgrass ◽  
The United States ◽  
Vegetative Compatibility ◽  
Major Group ◽  
Golf Courses ◽  
Sclerotinia Homoeocarpa ◽  
Dollar Spot ◽  
Geographical Regions

Sixty-seven isolates of Sclerotinia homoeocarpa, causing dollar spot disease in creeping bentgrass, annual bluegrass, Bermudagrass, and perennial ryegrass turf, collected from 23 golf courses in various geographical regions of the United States and Canada between 1972 and 2001, were characterized by vegetative compatibility, genetic diversity, and pathogenicity. Eleven vegetative compatibility groups (VCGs A to K) were identified among the isolates tested in this study, and five of them (VCGs G to K) were new. VCG B was the most predominant group, typifying 33 isolates (51%) tested. S. homoeocarpa isolates collected from golf courses in Pennsylvania belonged to seven VCGs (A, B, E, F, G, I, and K), whereas three groups were observed in those collected from New York (B, E, and G) and New Jersey (E, H, and I). Two isolates, one each from Pennsylvania and Canada, were incompatible when paired with the tester isolates in all possible combinations, and did not fall into any known VCG. An isolate collected from Canada was compatible with tester isolates from two VCGs (C and D). Genetic analyses using amplified fragment length polymorphism (AFLP) showed the presence of two genetically distinct groups, designated as major group and the minor group. The major group included 36 isolates collected from various golf courses in the United States and Canada. Two isolates collected from bermudagrass in Florida formed a separate cluster, the minor group. Isolates that belonged to the major group were further divided into two subgroups (1 and 2). Subgroup 1 consisted of all the isolates that belonged to VCGs A, E, G, H, and I. Three of the four isolates that belonged to VCG K also were clustered with isolates of subgroup 1. Subgroup 2 consisted of all the isolates from VCG B, and one each from VCGs F and K. Pathogenicity assays on Penncross creeping bentgrass showed significant differences (P = 0.05) in virulence among the isolates. Overall, a relationship between virulence and VCGs was observed, in which certain virulence groups corresponded to specific VCGs; however, such a relationship was not observed between virulence and AFLPs. Close similarity among isolates of S. homoeocarpa collected from different locations in the United States and Canada suggests that isolates of the same genotype could be involved in outbreaks of dollar spot epidemics at multiple locations.

scholarly journals Mowing Frequency and Plant Growth Regulator Effects on Dollar Spot Severity and on Duration of Dollar Spot Control by Fungicides

Plant Disease ◽  
2011 ◽  
Vol 95 (11) ◽  
pp. 1433-1442 ◽  
Author(s):  
Alexander I. Putman ◽  
John E. Kaminski
Keyword(s):  
Plant Growth ◽  
Creeping Bentgrass ◽  
Agrostis Stolonifera ◽  
Golf Course ◽  
Sclerotinia Homoeocarpa ◽  
Dollar Spot ◽  
Confounding Effect ◽  
Residual Efficacy ◽  
The University ◽  
University Of Connecticut

Management of dollar spot (incited by Sclerotinia homoeocarpa) on golf course fairways is increasingly challenging. The objectives of this study were to determine the influence of mowing frequency and plant growth regulators (PGRs) on dollar spot severity and on the residual efficacy of fungicides for control of dollar spot. Two 4-month-long studies were conducted on ‘Putter’ creeping bentgrass (Agrostis stolonifera) maintained as a fairway at the University of Connecticut. Treatments were arranged in a three-by-three-by-five factorial that assessed the influence of mowing frequency (2, 4, or 6 days week–1) and PGRs (paclobutrazol, trinexapac-ethyl, or none) on dollar spot control by five fungicide treatments (boscalid, chlorothalonil, iprodione, propiconazole, or none). Turf was mowed in the afternoon hours to minimize the confounding effect of mowing frequency on leaf wetness duration. Treatments were initiated in the late spring of 2007 and 2008, and each fungicide treatment was reapplied only when dollar spot exceeded a threshold of five infection centers plot–1. In the absence of fungicides, dollar spot severity was reduced by 63 to 90% in plots treated with paclobutrazol and by 13 to 55% in plots treated with trinexapac-ethyl. Dollar spot severity was 23 to 50% lower in plots mown 2 days week–1 compared with those mown 6 days week–1. In cases where a significant interaction was observed between mowing frequency and PGRs, dollar spot was reduced on most rating dates in plots treated with trinexapacethyl that were mown 2 days week–1 compared with those mown 6 days week–1. Survival analysis of days until threshold was met revealed that duration of control of fungicides in plots receiving paclobutrazol were 28 to 84% longer compared with plots not receiving PGR. Duration of control by fungicides was generally similar between plots treated with trinexapac-ethyl and no PGR. In general, mowing frequency did not influence duration of control. Results from this study indicate that paclobutrazol could be used to increase the treatment interval of fungicides and that mowing frequency in the absence of dew is likely to have little influence on fungicide residual efficacy. When used without fungicides, PGRs and less frequent mowing may reduce dollar spot in situations where fungicide use is limited.

Suppression of Dollar Spot on Creeping Bentgrass and Annual Bluegrass Turf with Compost-Amended Topdressings

Plant Disease ◽  
1992 ◽  
Vol 76 (9) ◽  
pp. 954 ◽  
Author(s):  
Eric B. Nelson
Keyword(s):  
Creeping Bentgrass ◽  
Dollar Spot ◽  
Annual Bluegrass

Influence of Summer Spoonfeeding Six Nitrogen Sources On Dollar Spot Severity and Chlorothalonil Efficacy in Creeping Bentgrass

2011 ◽  
Vol 8 (1) ◽  
pp. 1-9 ◽  
Author(s):  
C. P. Ryan ◽  
P. H. Dernoeden ◽  
A. P. Grybauskas ◽  
B. Momen
Keyword(s):  
Nitrogen Sources ◽  
Creeping Bentgrass ◽  
Dollar Spot
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