Dollar Spot Severity as Influenced by Fungicide Mode of Activity and Spray Nozzle

Kaminski, John E.; Fidanza, Michael A.

doi:10.21273/hortsci.44.6.1762

Cited by 10 publications

(8 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fungicides and TE were applied using procedures shown to provide optimum dollar spot control on fairway height turf with a CO 2 -pressurized (276 kPa) sprayer equipped with an air-induction flat fan nozzle (AI9504E; TeeJet, Wheaton, IL) and calibrated to deliver water at 407 L · ha -1 (Couch, 1984;Kaminski and Fidanza, 2009;McDonald et al, 2006). All plots were mowed 1 d before dew removal and fungicide application and were mowed again 2 d after treatments.…”

Section: Methodsmentioning

confidence: 99%

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

Huang

Kaminski

Landschoot

2015

horts

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Methodsmentioning

confidence: 99%

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

Huang

Kaminski

Landschoot

2015

horts

Self Cite

View full text Add to dashboard Cite

show abstract

“…In contrast, Fidanza et al (2009) showed that nozzles delivering medium and coarse droplets increased chlorothalonil efficacy against dollar spot compared to fine and extra coarse droplets. Kaminski and Fidanza (2009) also determined that nozzle type influenced fungicide efficacy against dollar spot on fairways in areas with high disease pressure.…”

Section: Core Ideasmentioning

confidence: 99%

“…Proper water carrier volume and nozzle selection are crucial components in optimizing fungicide applications and maintaining acceptable turfgrass quality (Fidanza et al., 2009; Kaminski & Fidanza, 2009; Mattox et al., 2020; McDonald et al., 2006; Shepard et al., 2006). Mattox et al.…”

Section: Introductionmentioning

confidence: 99%

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

Hutchens

Roberson

Shelton

et al. 2021

Intl Turfgrass Soc Res J

View full text Add to dashboard Cite

Dollar spot (Clarireedia spp.) is a damaging turfgrass disease. Ferrous sulfate (FeSO 4 ) suppresses dollar spot with little risk of resistance. Optimizing FeSO 4 applications is crucial for adequate dollar spot suppression. Supplementing FeSO 4 applications with chlorothalonil fungicide could also increase efficacy against dollar spot and longevity of disease suppression. Four experiments were conducted to determine the 1) optimal water carrier volume for FeSO 4 , 2) proper nozzle selection for FeSO 4 applications, 3) most efficacious rate combination of FeSO 4 and chlorothalonil, and 4) longevity of chlorothalonil efficacy when applied in conjunction with FeSO 4 for dollar spot suppression on creeping bentgrass (Agrostis stolonifera L.). These studies were conducted on either putting greens mown at 3.2 to 6.4 mm or fairways mown at 16.5 mm. The following carrier volumes were tested in Experiment 1: 281, 421, 842 and 1684 L ha -1 . For Experiment 2, Turbo FloodJet (TF), Turbo TeeJet Induction (TTI), Air Induction Turbo TwinJet (AITTJ), and Extended Range Flat Fan (XRFF) nozzles were used to determine optimal nozzle type. In Experiment 3, chlorothalonil was applied at 0, 2.28, 4.57, 6.86 and 9.16 kg a.i. ha -1 with or without 48.8 kg ha -1 of FeSO 4 . In Experiment 4, 48.8 kg ha -1 of FeSO 4 was applied biweekly and chlorothalonil was curatively applied at 8.2 kg a.i. ha -1 when infection centers per plot reached 30. Water carrier volume had no effect on dollar spot suppression, the AITTJ and XRFF nozzles provided the greatest disease suppression and turf quality, FeSO 4 reduced effective chlorothalonil rates by up to 68.5% and FeSO 4 increased longevity of chlorothalonil efficacy.

show abstract

“…Two application factors that have been shown to impact the effectiveness of fungicides targeting turf diseases are spray volume and application timing (3,4,8). Nozzle type also can influence fungicide performance (7,8).…”

Section: Introductionmentioning

confidence: 99%

Early Curative Dollar Spot Control in Creeping Bentgrass as Influenced by Fungicide Spray Volume and Application Timing

Pigati

Dernoeden

Grybauskas

2010

Applied Turfgrass Science

View full text Add to dashboard Cite

The importance of spray volume and application timing of a fungicide targeting dollar spot (Sclerotinia homoeocarpa F. T. Bennett) has been investigated, but with conflicting results. The objectives of this field study were to assess the influence of two spray volumes (468 and 935 liters water/ha) and two application timings (AM to a canopy wet with dew versus PM to a dry canopy) for fungicides targeting dollar spot curatively. Chlorothalonil (8.5 kg a.i./ha), propiconazole (0.5 kg a.i./ha), and a tank‐mix of chlorothalonil + propiconazole were compared on fairway height stands of ‘Crenshaw’ (2007 and 2008), ‘Backspin’ (2008), and ‘Providence’ (2009) creeping bentgrass (Agrostis stolonifera L.). There were no spray volume differences in 2007 or 2009. In 2008 in Crenshaw, there was less dollar spot in chlorothalonil‐treated plots using the low versus high spray volume, but the opposite occurred in Backspin. Less dollar spot developed in propiconazole‐treated plots subjected to the low versus high spray volume in Crenshaw in 2008. Higher levels of dollar spot developed in plots treated with propiconazole in the PM compared to the AM in 2009. The tank‐mix of chlorothalonil + propiconazole was unaffected by spray volume or application timing at all sites. The preponderance of data indicated that the curatively applied fungicides generally provided similar levels of dollar spot control at the two spray volumes and application timings evaluated.

show abstract

Dollar Spot Severity as Influenced by Fungicide Mode of Activity and Spray Nozzle

Cited by 10 publications

References 10 publications

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

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

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

Early Curative Dollar Spot Control in Creeping Bentgrass as Influenced by Fungicide Spray Volume and Application Timing

Contact Info

Product

Resources

About