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PODCAST

Turfgrass Epistemology

This podcast explores how we know what we know about turfgrass science. If you are a lawn care operator, sport field manager, sod producer, golf superintendent, or a home owner, this podcast provides evidence-based information to help you better manage your turfgrass.

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All Episodes

84:21

S4 E22 Elevated Lawnscapes, Turf Therapy, and Polo...

Turfgrass Epistemology ·

2026/04/02

In this episode, I sit down with Rob from Turf Therapy and Cam from Elevated Lawnscapes to talk all things lawn care, content creation, and turfgrass management. We discuss their approach to building great lawns, lessons learned on YouTube, and how they balance real-world lawn care with online advice.This is a great conversation for anyone interested in DIY lawn care, turfgrass tips, and the growing lawn care YouTube community. #turfgrass #lawncare #lawnyoutube #turftherapy #elevatedlawnscapes

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58:09

S4 E21 Calcium vs. Limestone on Dollar Spot.

Turfgrass Epistemology ·

2026/03/31

In this video, I break down the study “Influence of Calcium and Nitrogen Fertilizer on Creeping Bentgrass Infected with Dollar Spot.” We examine whether it is calcium or lime that actually suppresses dollar spot, how it compares to nitrogen, and what happens when the two are applied together. The results show that both calcium and nitrogen reduced disease individually, but combining them was less effective due to antagonism, with calcium also improving root growth and stress tolerance rather than

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108:13

S4 E20 Can Milorganite, Sea Kelp, or Manure Reduce...

Turfgrass Epistemology ·

2026/03/26

In this video, I break down the classic study “Microbial Populations and Suppression of Dollar Spot Disease in Creeping Bentgrass with Inorganic and Organic Amendments.” We take a close look at whether organic fertilizers actually suppress dollar spot and how they influence microbial populations in turfgrass systems.The results show that while some organic amendments increased microbial activity, dollar spot suppression was inconsistent and often less effective than fungicides, with nitrogen and

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61:09

S4 E19 Dr. Scott McElroy - Herbicide and Insecticide...

Turfgrass Epistemology ·

2026/03/24

In this episode, I interview Dr. Scott McElroy (Auburn University) about weed control in turfgrass, including best practices for herbicide timing, resistance management, and how herbicides interact with insecticides. We also discuss common mistakes, application strategies, and where to find reliable, evidence-based recommendations. If you manage turf, this conversation will help you improve your weed identification, herbicide programs, and integrated pest management (IPM) decisions. #turfgrass

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96:14

S4 E18 Tinfoil Turfgrass - Floratine 'Master Class'...

Turfgrass Epistemology ·

2026/03/19

In this video, I break down a Floratine Masterclass where Tim Cartwright discusses a common claim about calcium availability in soils. I examine the argument, the science behind calcium in turfgrass soils, and whether the explanation actually aligns with what we know from soil chemistry and turfgrass research.If you manage turfgrass or are interested in soil testing, calcium availability, base saturation, and turfgrass fertility myths, this discussion will help you think critically about the claims

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67:19

S4 E17 Organic Fertilizers and Turfgrass Disease

Turfgrass Epistemology ·

2026/03/17

In this video, I break down the research article “Soil Amendments and Fertilizer Source Effects on Creeping Bentgrass Establishment, Soil Microbial Activity, Thatch, and Disease.” We examine whether organic fertilizers, poultry meal, and humate soil amendments really improve bentgrass establishment, microbial activity, disease suppression, and thatch management on sand-based greens.The results show that readily available nitrogen from synthetic fertilizers produced faster establishment and

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63:01

S4 E16 Organic Fertilizer and Dollar Spot.

Turfgrass Epistemology ·

2026/03/12

In this video, I review the classic turfgrass study “Dollar Spot Severity, Tissue Nitrogen, and Soil Microbial Activity in Bentgrass as Influenced by Nitrogen Source.” We take a close look at whether organic fertilizers really suppress dollar spot and whether soil microbial activity plays the role many people claim.The results may surprise you. The study found that disease suppression was more closely related to nitrogen availability and turf growth than to microbial activity or organic fertilizer

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68:19

S4 E15 Do Spray Nozzles and Volume Influence Dollar...

Turfgrass Epistemology ·

2026/03/11

In this video, I review the research article “Strategies for Increasing Ferrous Sulfate Efficacy Against Dollar Spot of Creeping Bentgrass.” We examine how ferrous sulfate (FeSO₄) can suppress dollar spot, how application techniques affect performance, and whether combining it with chlorothalonil improves disease control. The study found that nozzle selection and application strategy influence performance, and that ferrous sulfate can reduce the amount of chlorothalonil needed and extend its

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75:34

S4 E14 Tinfoil Turfgrass: The BS Behind Amino Acids...

Turfgrass Epistemology ·

2026/03/05

In this episode of Turfgrass Epistemology, I critically examine the article “Exploratory Study on the Foliar Incorporation and Stability of Isotopically Labeled Amino Acids Applied to Turfgrass” (Agronomy, 2020) and use it as a case study in how “science” can be used to persuade without truly informing.On the surface, this paper uses isotopic labeling to show that foliar-applied glutamate can be absorbed and incorporated into creeping bentgrass metabolism. But in this video, I explain why the

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63:09

S4 E13 Does Dew Removal Reduce Dollar Spot?

Turfgrass Epistemology ·

2026/03/03

In this episode of Turfgrass Epistemology, I break down the peer-reviewed Crop Science article “Mowing Strategies and Dew Removal to Minimize Dollar Spot on Creeping Bentgrass” by Ellram, Horgan, and Hulke (2007).This study evaluates how mowing time, dew removal frequency, blade sharpness, and leaf wetness duration (LWD) influence dollar spot severity on creeping bentgrass fairways. I explain why mowing at 4:00 AM consistently reduced dollar spot compared to 10:00 AM, why daily dew removal

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61:49

S4 E12 Common Diseases on Cool-Season Lawns

Turfgrass Epistemology ·

2026/02/26

In this episode of Turfgrass Epistemology, I discuss the Purdue Extension publication “Common Diseases on Cool-Season Lawns” (BP-218-W), a practical guide to identifying and managing diseases on Kentucky bluegrass and tall fescue.This publication outlines major lawn diseases including dollar spot, brown patch, Pythium blight, red thread, rust, summer patch, gray leaf spot, and leaf spot/melting out, while also emphasizing the critical distinction between biotic diseases and abiotic disorders such

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51:19

S4 E11 Does Blending Bentgrass Cultivars Reduce...

Turfgrass Epistemology ·

2026/02/24

In this episode of Turfgrass Epistemology, I discuss the peer-reviewed article “Dollar Spot Resistance among Blends of Creeping Bentgrass Cultivars” by Abernathy et al. (2001), published in Crop Science.This study evaluates whether blending creeping bentgrass cultivars can reduce dollar spot severity compared to monostands on golf course putting greens. I explain how highly susceptible cultivars like Crenshaw increased disease pressure in blends, how resistant cultivars like L-93 suppressed dollar

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53:15

S4 E10 Irrigation Influence on Disease and Weeds.

Turfgrass Epistemology ·

2026/02/19

In this episode of Turfgrass Epistemology, I break down the classic Crop Science paper “Assessing Irrigation Management for Its Effects on Disease and Weed Levels in Perennial Ryegrass” by Jiang, Fry, and Tisserat (1998).This study directly examines how irrigation scheduling (daily vs. ET-based irrigation) influences brown patch, dollar spot, weed pressure, pesticide use, and turf quality on perennial ryegrass fairways. I explain how ET-based irrigation reduced water use by nearly 200%, how daily

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70:47

S4 E9 February 2026 Comments and Emails: Part 2

Turfgrass Epistemology ·

2026/02/17

In this episode of Turfgrass Epistemology – Comments & Emails Part 2, I continue responding to viewer questions and email discussions about turfgrass management, soil testing, fertilizer programs, dollar spot control, and common lawn care myths.This follow-up video addresses new comments from golf course superintendents, lawn care operators, and homeowners who are trying to separate evidence-based turfgrass science from marketing claims and social media advice. I clarify misunderstandings about

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72:41

S4 E8 February 2026 Comments and Emails.

Turfgrass Epistemology ·

2026/02/12

In this episode of Turfgrass Epistemology, I respond to viewer comments and emails covering some of the most common questions and misconceptions I see about turfgrass science, soil fertility, nutrient management, and disease control.I address recurring themes from golf course superintendents, lawn care professionals, and homeowners, explain where confusion often arises, and clarify how peer-reviewed research should be interpreted instead of relying on anecdotes, marketing claims, or social media

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63:29

S4 E7 Light vs Heavy Irrigation on Dollar Spot and...

Turfgrass Epistemology ·

2026/02/10

In this episode of Turfgrass Epistemology, I discuss the peer-reviewed article “Dollar Spot and Gray Leaf Spot Severity as Influenced by Irrigation, Chlorothalonil, Paclobutrazol, and a Wetting Agent” by McDonald, Dernoeden, and Bigelow (2006), published in Crop Science. This landmark study examines how irrigation regime, soil moisture, and common management inputs influence dollar spot and gray leaf spot development on creeping bentgrass and perennial ryegrass fairways. I explain why dollar spot

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57:05

S4 E6 Combining Urea and Iron Sulfate for Dollar Spot...

Turfgrass Epistemology ·

2026/02/09

In this episode of Turfgrass Epistemology, I discuss and interpret the peer-reviewed article “Optimizing Liquid-Applied Iron Sulfate Rate and Application Interval for Dollar Spot Suppression on Golf Course Fairways” by Soldat et al. (2024), published in Crop Science. This paper builds on earlier iron sulfate research and focuses on practical optimization—how rate, application interval, and spray volume influence dollar spot suppression on creeping bentgrass and annual bluegrass fairways. I explain

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59:09

S4 E5 Iron Sulfate vs. Iron Chelate for Dollar Spot?

Turfgrass Epistemology ·

2026/02/03

In this episode of Turfgrass Epistemology, I discuss and interpret the peer-reviewed article “Influence of Ferrous Sulfate and Its Elemental Components on Dollar Spot Suppression” by McCall et al. (2016), published in Crop Science. This paper is foundational to many modern discussions about using iron—specifically ferrous sulfate—as a tool for managing dollar spot on creeping bentgrass putting greens.The study evaluates whether ferrous sulfate itself, or its individual components iron and sulfur,

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50:48

S4 E4 Iron Sulfate and Dollar Spot

Turfgrass Epistemology ·

2026/01/29

In this episode of Turfgrass Epistemology, I discuss and critically interpret the peer-reviewed article “Impact of Ferrous Sulfate Concentration on Clarireedia Isolate Growth and Dollar Spot Development” by Shelton et al. (2021), published in Crop Science. This paper is frequently cited in conversations about using iron—specifically ferrous sulfate—as a non-fungicidal tool for dollar spot suppression on golf course turf.The study combines multi-site field trials with controlled in-vitro experiments

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63:49

S4 E3 Does Nitrogen Suppress Dollar Spot?

Turfgrass Epistemology ·

2026/01/28

In this episode of Turfgrass Epistemology, I break down and discuss the peer-reviewed article “Dollar Spot Suppression on Creeping Bentgrass in Response to Repeated Foliar Nitrogen Applications” by Townsend et al. (2021), published in Plant Disease. This paper directly addresses one of the most common and controversial questions in turfgrass management: can nitrogen fertilization meaningfully suppress dollar spot without relying solely on fungicides? The study evaluated repeated foliar nitrogen

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