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

Results suggest that sand topdressing was more consistent at reducing dollar spot (Clarireedia jacksonii) in fairway turfgrass more so than rolling. This practice could be an effective cost-saving alternative to reduce frequent fungicide applications. Research was conducted from 2011 to 2014 on a simulated golf fairway and examined dollar spot severity responses in a mixed-stand of creeping bentgrass (Agrostis stolonifera) and annual bluegrass (Poa annua ssp. reptans) to sand topdressing and rolling. Treatments consisted of biweekly sand topdressing, rolling at three frequencies (one, three, or five times weekly), a control, and three replications. Infection was visually estimated. Sand topdressing significantly (P < 0.05) reduced disease up to 50% at the peak of the dollar spot activity in 2011, 2013, and 2014. Results on the effects of rolling on dollar spot were inconsistent.

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Effects of rolling and N-fertilization on dollar spot and Microdochium patch on golf greens in Scandinavia

BIO Web of Conferences ◽

10.1051/bioconf/20201800008 ◽

2020 ◽

Vol 18 ◽

pp. 00008

Author(s):

Tatsiana Espevig ◽

Marina Usoltseva ◽

Karin Norman

Keyword(s):

Creeping Bentgrass ◽

N Fertilization ◽

Dollar Spot ◽

Golf Greens ◽

Annual Bluegrass ◽

Red Fescue

Dollar spot was officially documented in Scandinavia in 2013 and the spread and damage from this disease has increased during last years. In summer 2017, on the golf greens with red fescue (Vallda GC, Sweden) and with the mixture of red fescue, colonial bentgrass and annual bluegrass (Roskilde GC, Denmark) rolling 2 times per week reduced dollar spot 61% and 37% and rolling 4 times per week reduced dollar spot 95% and 54%, respectively. Thus, rolling 3-4 times per week can be recommended on golf greens with dollar spot pressure. In the experiment 2018 dollar spot was reduced 24% with increase in nitrogen from 150 to 240 kg ha-1 yr-1 on creeping bentgrass/annual bluegrass golf green (Kävlinge GK, Sweden). However, the increased N-rate lead to a higher degree Microdochium patch from 14% to 30%.

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Use of the growth regulator paclobutrazol in the management of dollar spot of creeping bentgrass in Minnesota

Phytoprotection ◽

10.7202/706181ar ◽

2005 ◽

Vol 80 (2) ◽

pp. 65-70 ◽

Cited By ~ 3

Author(s):

J. Mercier

Keyword(s):

Disease Control ◽

Growth Regulator ◽

Creeping Bentgrass ◽

Poa Annua ◽

Base Line ◽

Agrostis Palustris ◽

Dollar Spot ◽

Annual Bluegrass ◽

Growing Seasons

The control of dollar spot by paclobutrazol applied as a growth regulator on a creeping bentgrass (Agrostis palustris) and annual bluegrass (Poa annua) fairway turf was compared with two standard fungicide treatments in Minnesota during two growing seasons. Paclobutrazol was applied every 3 weeks, staggered by about 10 days with fungicide treatments (chlorothalonil or propiconazole), also applied every 3 weeks. Paclobutrazol alone significantly reduced the number of dollar spot infection centers during both summers, often by as much as 80%. Chlorothalonil or propiconazole were usually more effective in controlling dollar spot than paclobutrazol. Paclobutrazol improved disease control by fungicides when tested in combination with various rates of chlorothalonil or propiconazole. Paclobutrazol applied as a growth regulator could thus be used to reduce the base line severity of dollar spot of turf.

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Trinexapac-Ethyl Influences Bispyribac-Sodium Absorption and Efficacy for Annual Bluegrass (Poa annua) Control in Creeping Bentgrass (Agrostis stolonifera)

Weed Technology ◽

10.1614/wt-08-015.1 ◽

2010 ◽

Vol 24 (3) ◽

pp. 326-331 ◽

Cited By ~ 2

Author(s):

Patrick E. McCullough ◽

Stephen E. Hart

Keyword(s):

Laboratory Experiments ◽

Management Practices ◽

Field Experiments ◽

Creeping Bentgrass ◽

Agrostis Stolonifera ◽

Sodium Absorption ◽

Dollar Spot ◽

Cool Season ◽

Annual Bluegrass ◽

Wettable Powder

Bispyribac-sodium selectively controls annual bluegrass in cool-season turf but efficacy may be influenced by management practices, such as plant growth regulator use. Experiments were conducted in New Jersey to investigate efficacy and absorption of bispyribac-sodium applied with trinexapac-ethyl for annual bluegrass control and turfgrass tolerance. In laboratory experiments with annual bluegrass, creeping bentgrass, and perennial ryegrass, tank-mixing trinexapac-ethyl with14C-bispyribac-sodium increased presumed foliar absorption of14C-bispyribac-sodium compared with nontrinexapac-ethyl treated; absorption increased with trinexapac-ethyl rate. Differences in14C-bispyribac-sodium absorption were not detected among emulsifiable concentration, microencapsulated concentration, and wettable powder trinexapac-ethyl formulations. In field experiments, sequential bispyribac-sodium applications controlled annual bluegrass 93%, but trinexapac-ethyl did not affect efficacy. Tank-mixing all trinexapac-ethyl formulations with bispyribac-sodium provided similar annual bluegrass control and creeping bentgrass quality compared with bispyribac-sodium alone. Applications of bispyribac-sodium reduced dollar spot cover in both years, whereas trinexapac-ethyl reduced dollar spot cover only in 2005.

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Ferrous Sulfate Suppressed Dollar Spot on Creeping Bentgrass

CSA News ◽

10.1002/csan.20455 ◽

2021 ◽

Keyword(s):

Ferrous Sulfate ◽

Creeping Bentgrass ◽

Dollar Spot

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Genetic Variation Among Colletotrichum graminicola Isolates from Four Hosts Using Isozyme Analysis

Plant Disease ◽

10.1094/pdis.2004.88.4.402 ◽

2004 ◽

Vol 88 (4) ◽

pp. 402-406 ◽

Cited By ~ 6

Author(s):

B. J. Horvath ◽

J. M. Vargas

Keyword(s):

Genetic Variation ◽

Genetic Distance ◽

Geographic Origin ◽

Creeping Bentgrass ◽

Genetic Distances ◽

Colletotrichum Graminicola ◽

Annual Bluegrass ◽

Close Relationship ◽

Host Origin ◽

Serious Disease

Anthracnose basal rot (ABR) is a serious disease of turfgrasses that is caused by the pathogen Colletotrichum graminicola. The relationships of isolates causing ABR on turfgrasses to those causing disease on important crop hosts (maize, sorghum) remain unresolved. Genetic variation among isolates from annual bluegrass, creeping bentgrass, maize, and sorghum was evaluated based on host origin and geographic origin. Isozymes were used to estimate the genetic variation of the isolates. Five enzyme systems comprising 16 alleles from 5 loci were used. Allele frequencies, genetic distance, and linkage disequilibrium values were calculated for isolates based on both host and geographic origin. Isolates from creeping bentgrass and annual bluegrass were the most closely related based on Nei's genetic distance, while isolates from maize and sorghum were the most distantly related, consistent with their known species-level relationship. Isolates from annual bluegrass and creeping bentgrass had different genetic distances to isolates from both maize and sorghum. Annual bluegrass isolates from different geographic regions had the smallest genetic distance values observed in this study, indicating a very close relationship regardless of geographic origin. Based on these data, it appears that host origin, not geographic origin, plays a more important role in the genetic diversity of these fungi.

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