Simulated Rainfall and Mowing Impact Fungicide Performance When Targeting Dollar Spot in Creeping Bentgrass

Pigati, Raymond L.; Dernoeden, Peter H.; Grybauskas, A. P.; Momen, Bahram

doi:10.1094/pdis-94-5-0596

Cited by 19 publications

(15 citation statements)

References 13 publications

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“…The reduced control of early blight following application of the fungicides iprodione and boscalid after exposure to simulated rain was also noted by Pigati, Dernoeden, and Grybauskas (2010) while studying the control of Sclerotinia homeocarpa on golf courses. In experiment 2, the greater rainfastness observed for boscalid, when compared to iprodione, may be explained by its greater systemicity in relation to this dicarboximid (HEWIT, 1998;RHEINHEIMER, 2007).…”

Section: Resultsmentioning

confidence: 82%

Effect of simulated rain on the efficiency of fungicides in potato late blight and early blight control

Töfoli

Domingues

Melo³

et al. 2014

Sem. Ci. Agr.

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Rainfastness of fungicides used in the control of late blight (Phytophthora infestans) and early blight (Alternaria solani) of potato was evaluated under green house and laboratory conditions. 'Agata' and 'Monalisa' plants treated with fungicides against both diseases were subjected to 20 mm controlled rain simulation for 6 min at 30 min, 1, 2, and 4 h after application. Once all leaves had dried, foliar discs were transferred to Petri dishes and inoculated with the respective pathogens. The plates were then incubated in a BOD chamber for a 12-h photoperiod at 18°C and 25°C, respectively. Disease severity was evaluated by determining the area (%) of the foliar discs affected by disease on 5 and 7 days postinoculation. The results suggest that systemic or inherent tenacity fungicides were less influenced by the simulated rain as compared to contact fungicides. An increase in drying time promoted higher control levels of both diseases, indicating a better retention and absorption of the tested fungicides. Key words: Phytophthora infestans, Alternaria solani, Solanum tuberosum L., tenacity, rainfastness ResumoA resistência de fungicidas à chuva no controle da requeima (Phytophthora infestans) e pinta preta (Alternaria solani) da batata foi avaliada em condições de casa-se vegetação e laboratório. Plantas de batata das cultivares Agata e Monalisa tratadas com fungicidas indicados para as duas doenças foram submetidas à chuva controlada de 20 mm durante 6 minutos aos 30 minutos, 1, 2 e 4 horas após a pulverização. Após a secagem das plantas, discos foliares foram coletados e transferidos para placas de Petri e inoculados com os patógenos. Em seguida as placas foram incubadas em câmara BOD a 18° C para P. infestans e 25 ° C para A. solani, sob fotoperíodo de 12 horas. A severidade foi avaliada através da porcentagem da área do disco afetada pelas doenças aos 5 e 7 dias após a inoculação, respectivamente. Os resultados obtidos permitiram concluir que os fungicidas sistêmicos, translaminares ou com tenacidade inerente foram menos afetados pela chuva simulada quando comparados aos fungicidas de contato. O aumento do tempo de secagem promoveu maiores níveis de controle da requeima e pinta preta, evidenciando uma maior retenção ou absorção dos produtos testados.

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Section: Resultsmentioning

confidence: 82%

Effect of simulated rain on the efficiency of fungicides in potato late blight and early blight control

Töfoli

Domingues

Melo³

et al. 2014

Sem. Ci. Agr.

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“…Dollar spot was allowed to develop to trace levels [i.e., seven dollar spot infection centers/plot or less (DSIC)] in the study areas to ensure the epidemic had begun, as has been done in previous studies (McDonald et al, 2006;Pigati et al, 2010). Fungicide treatments included Daconil Ultrex 82.5 WDG Ò (chlorothalonil: 2,4,5,6-tetrachloroisophthalonitrile; Syngenta Crop Protection, Greensboro, NC) applied at 8.17 kg a.i./ha, Banner Maxx were treated with two applications of TE on a 14-d interval before fungicide application.…”

Section: Methodsmentioning

confidence: 99%

“…In another study, Delvalle et al (2011) reported that dollar spot control with fungicides can be extended by daily dew removal or increased mowing frequency. Increased mowing frequency likely results in a reduction of dollar spot as a result of dew removal as well as physical disruption and removal of inoculum (Delvalle et al, 2011;Pigati et al, 2010).…”

mentioning

confidence: 99%

“…In a recent study, Pigati et al (2010) concluded that early morning mowing before fungicide applications improved the performance of fungicides compared with plots mowed in the afternoon. Although some information exists for dollar spot control relative to dew removal strategies alone, or after fungicide applications, the impact of dew at the time of fungicide application is still not well understood.…”

mentioning

confidence: 99%

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Regulation with Trinexapac-ethyl and Dew Removal at the Time of Fungicide Application Did Not Influence Dollar Spot Control

Huang

Kaminski

Landschoot

2015

horts

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Dollar spot, caused by Sclerotinia homoeocarpa F.T. Bennett, is an important disease of creeping bentgrass (Agrostis stolonifera L.) on golf courses in the northern United States. Canopy moisture in the form of dew plays an important role in the development of dollar spot and routine displacement has been shown to reduce disease severity. The use of plant growth regulators (PGRs) is a common management practice for maintaining creeping bentgrass fairways, but their influence on dollar spot is unclear. The objective of this field study was to elucidate the influence of dew removal at the time of fungicide application on dollar spot control in creeping bentgrass regulated by trinexapac-ethyl (TE). Main factors in the study included three dew removal strategies (non-treated, dew removed–mowed, and dew removed–not mowed) before the application of four fungicide treatments (non-treated, chlorothalonil, propiconazole, and iprodione). All fungicide treatments were applied once to turfgrass previously treated with TE or not treated. The presence or absence of dew at the time of fungicide application generally had no influence on fungicide performance with respect to dollar spot control. Based on the results of this study, dew removal before the application of fungicides targeting dollar spot is unnecessary. Applications of TE before fungicides reduced dollar spot severity in some cases, but reductions in symptom expression were limited and did not result in markedly improved dollar spot control.

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“…A recent study examining the effects of simulated rain and mowing timing on fungicide performance showed that mowing in the morning versus afternoon mowing significantly reduced dollar spot across all fungicide treatments (10). The authors reported 54 to 65% fewer infection centers (IC) in plots mowed in the morning compared with plots mowed in the afternoon when averaged across chlorothalonil, propiconazole, boscalid, and iprodione treatments.…”

mentioning

confidence: 99%

Effects of Dew Removal and Mowing Frequency on Fungicide Performance for Dollar Spot Control

2011

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Dollar spot (Sclerotinia homoeocarpa) is a severe disease problem on creeping bentgrass (Agrostis stolonifera) fairways. The objective of this study was to evaluate the effects of dew removal and mowing frequency on fungicide performance for dollar spot control. In 2009 and 2010, an experiment involving daily dew removal or no dew removal, mowing frequency (2, 4, and 6 days week–1), and fungicides (chlorothalonil, propiconazole, and iprodione) was conducted on creeping bentgrass maintained as a fairway. Daily dew removal resulted in fewer dollar spot infection centers (IC) compared with not removing dew during late summer 2009 and 2010 for all mowing-frequency and fungicide treatments. As mowing frequency increased from 2 to 6 days week–1, dollar spot IC decreased when averaged across all fungicide treatments. For all fungicides, daily dew removal increased the number of days needed to reach a 15-IC plot–1 point of reference when compared with fungicide treatments in which dew was not removed. The number of days required to reach 15 IC varied with fungicide, mowing frequency, and year the test was conducted. Results demonstrate that dollar spot control with fungicides can be extended when daily dew removal is employed and, in some cases, when mowing frequency is increased on dew-covered turf. Benefits of dew-removal practices on dollar spot and fungicide performance can vary with weather conditions, fungicide, threshold level, and possibly other factors.

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Simulated Rainfall and Mowing Impact Fungicide Performance When Targeting Dollar Spot in Creeping Bentgrass

Cited by 19 publications

References 13 publications

Effect of simulated rain on the efficiency of fungicides in potato late blight and early blight control

Effect of simulated rain on the efficiency of fungicides in potato late blight and early blight control

Regulation with Trinexapac-ethyl and Dew Removal at the Time of Fungicide Application Did Not Influence Dollar Spot Control

Effects of Dew Removal and Mowing Frequency on Fungicide Performance for Dollar Spot Control

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