Library

Aeration Timing for Cool-Season UK/IE Greens

Aeration is the controlled mechanical disruption of the rootzone — hollow tining (extracting cores), solid tining (puncturing without extraction), slitting, and deep-tine variants — used to relieve compaction, gas-exchange limits, and exces

Anthracnose — Foliar Blight and Basal Rot (STRI ITM)

Anthracnose is a debilitating disease of putting-green turf caused by *Colletotrichum graminicola* (also referenced in modern taxonomy as *C. cereale*). On UK / IE cool-season greens it is almost exclusively a disease of annual meadow-grass

Championship Greens Prep — The Belfry

This entry documents the **daily championship-prep doctrine** Jamie Wade runs on The Belfry's Brabazon course — a venue that has hosted four Ryder Cups and operates with 200+ golfers per day on Open-speed greens year-round. The framing is *

Climate Adaptation — UK Multi-Manager Doctrine

A **multi-manager doctrine entry** documenting how three named UK course managers have *operationally* adapted to climate shifts. Frames adaptation as a cross-cutting practice rather than a single-axis threshold change: the same supes who m

Cool-Season Cutting Heights (UK Examples)

Cool-season turf — bentgrass, fescue, poa annua, perennial ryegrass — tolerates close mowing on UK and Ireland courses. There is **no single BIGGA-published "recommended" cutting height table**: BIGGA's editorial framing is that heights are

Course Closure Tier Policies — UK Examples

Concrete published examples of **tiered course-closure policies** from three named UK clubs — the operational ladder that sits between "fully open" and "course closed" and the threshold conditions that move a course between rungs. This is t

Dew Formation Physics on Putting Surfaces

Dew is liquid water that condenses out of the air onto the turf canopy. The underlying mechanism is standard atmospheric science (no whitelisted turfgrass primary): on a clear, calm night the canopy radiates longwave heat to the sky faster

Dollar Spot — ITRI Koch Program (2026–2028)

The **International Turfgrass Research Initiative (ITRI)** is a co-funded research program established by **The R&A**, the **USGA**, and the **Scandinavian Turfgrass and Environment Research Foundation (STERF)** to direct shared investment

Dollar Spot Management (IPM)

Dollar spot is a foliar disease caused by the fungus **Clarireedia jacksonii** [psu-turf:landschoot-2023]. Symptoms on closely mown putting greens appear as spots "about the size of a silver dollar" in white or tan; on individual leaf blade

Earthworm Cast Management on UK Courses (Cultural-Only, post-Chemistry)

Earthworm casts are the surface-deposited soil that earthworms eject as part of their burrowing activity. On golf turf, the agronomic problem is not the worms themselves — most are beneficial — but the casts: under foot traffic and mowing,

Fairy Ring Management

Fairy rings are a turf phenomenon caused by various soil-inhabiting basidiomycete fungi. On golf greens they appear as "circular rings that may kill grass or damage it, stimulate grass growth or have fruiting bodies (mushrooms)" [bigga:2024

Flood Recovery — Royal Mid-Surrey Case

A case-study entry documenting Royal Mid-Surrey's ongoing recovery from a major Thames-corridor flood event — and, more usefully for Eagle AI, the **decision-sequence framing** Graham Down (Course Manager) uses to plan multi-hole flood reco

FRAC Codes Reference — UK Turf Fungicide Quick-Lookup

A **quick-lookup reference card** for the FRAC fungicide codes that matter on UK / Ireland greens-area programmes. One row per code: number, MoA group, target site, named active ingredients, FRAC-published resistance risk, and UK approval s

Frost Risk Thresholds and Frost-Delay Policy

Frost on a putting surface — visible white crystals on the canopy and ice within the leaf — is a hard go/no-go boundary for play. The damage mechanism is mechanical, not just cosmetic. BIGGA: "When grass freezes, water within its cells expa

Fungicide Resistance Management — UK Doctrine

The UK-applicable doctrine for **fungicide resistance management** — how to rotate chemistry to preserve the actives that remain after the withdrawals documented in [`withdrawn-actives-uk-reference`](withdrawn-actives-uk-reference.md). The

Golf Green Quality Standards — STRI Programme Target Ranges (R&A GC2030)

<!-- VERIFIER NOTE (2026-05-19, PR #1 / scout-sweep-v2): All 10 quantitative claims independently verified against PDF text via pypdf 6.11.0 extraction (Golf Green Quality Standards.pdf, 11pp). STRI Programme target ranges table on PDF P4 m

Golfer-Facing Voice — Course-Conditions Communication (Play Lens)

Golfer-facing voice doctrine is the **Play-lens register** for any course-conditions surface a member, visitor, or resort guest will read. It is the linguistic counterpart of the supe-facing Ops register documented in Eagle's Audit Rubric v

Green Firmness (TruFirm / Clegg)

Putting green firmness is the resistance of the surface to a golf ball's impact. Firm greens support the pitch-and-run "ground game" that defines links-style golf; thatchy or wet greens are soft and spongy, which both hurts playability and

Green Rolling — Frequency, Roller Type, and When to Skip

Rolling a putting green means passing a powered or towed cylinder (a "turf iron" — usually a smooth or lightly vibratory drum) over the surface to flatten micro-relief without removing leaf tissue. Unlike mowing, rolling does not stress the

Green Speed (Stimpmeter)

The Stimpmeter, developed by Edward S. Stimpson in 1935 and modified by the USGA's technical department in the 1970s, measures the distance a ball rolls on a putting green — "ball roll distance" (BRD). The mean roll-out distance, in feet, i

Handheld Sprayer Calibration (BIGGA NSTS Procedure)

The **BIGGA NSTS Hand Held Sprayer Calibration Sheet** (version 2.17) is the operational procedure for calibrating handheld and spot-treatment sprayers on UK golf courses — converting label-stated application rates (litres / hectare) into t

Integrated Turf Management of Parkland Greens (R&A Best Practice Handbook)

<!-- VERIFIER NOTE (2026-05-19, PR #1 / scout-sweep-v2): All 11 quantitative/textual claims independently verified against PDF via pypdf 6.11.0 (ITM of Parkland Greens.pdf, 29pp): - 55–110 kg/ha annual N mixed sward: P22 text "In a mixed sw

Leaf Wetness, Dew, and Disease Pressure

On cool-season UK and Ireland turf, leaf wetness duration — primarily from overnight dew — is among the dominant drivers of foliar disease pressure. BIGGA's 2024 common-diseases reference lists "leaf wetness" and "heavy dews" as turf condit

Leatherjacket Control on UK Greens (Cultural + Biological, post-Acelepryn)

Leatherjackets — the larvae of the crane fly (Tipulidae) — are the main insect pest affecting UK and Ireland golf greens. They feed beneath the surface on turf roots, compromising the plant's ability to recover and producing patchy spring w

Lightning Safety — Rule 5.7 Suspension of Play Protocol

Lightning safety on a golf course is, under the R&A Rules of Golf, both a **Committee responsibility** (Committee may suspend play) and a **player right** (player may unilaterally stop play if they "reasonably believe there is danger from l

Microdochium Patch — Model Thresholds and Predictive Indices

This entry is a **model-reference supplement** to the main [`microdochium-snow-mould`](microdochium-snow-mould.md) entry, which covers the qualitative disease profile, cultural management, and communication doctrine. This entry focuses spec

Microdochium Patch (Fusarium / Pink Snow Mould)

Microdochium patch (caused by *Microdochium nivale*, historically called Fusarium patch, and called pink snow mould when it develops under or after snow cover) is the most frequent and damaging disease of UK fine turf. BIGGA frames it as "a

Moisture Deviation Thresholds — UK Drought Spring 2025

Concrete numeric anchors for **moisture deviation thresholds** — volumetric water content (VWC) targets, evapotranspiration (ET) rates, and rainfall deficit context — surfaced by named UK course managers during a documented drought event. T

Nematode Resistance Management on Golf Course Turf — GCSAA / Crow Program (2024–2027)

Plant-parasitic nematodes are microscopic soil-dwelling roundworms that attack turfgrass roots. Most nematodes in golf soil are *beneficial* — they decompose organic matter or predate pest insects — but a few species cause progressive root

On-Course Met Station vs Grid Forecast — When Local Sensors Win

This entry documents when on-course weather station data should be preferred over a regional grid forecast, and when the grid forecast is the more reliable source. The distinction matters directly for Eagle's disease-pressure and irrigation

R&A Sustainable Agronomy Service — LET Official Agronomist Partnership (2026)

A reference / industry-context entry. On 4 February 2026, the R&A's **Sustainable Agronomy Service (SAS)** was appointed Official Agronomist of the **Ladies European Tour (LET)** for the 2026 season — covering **20 venues across three event

Spray Application Best Practices — UK Regulatory Compliance and Pre-Application Checklist

UK spray application on golf courses operates within a **legal compliance frame** established by the Official Controls (Plant Protection Products) Regulations 2020 ("OCR"). This entry is the regulatory-compliance + pre-application-checklist

Spray-Weather Decisions — Rainfast Intervals and Wet-Weather IDM Disruption

Spray-weather decisions cover the question "should I spray right now, delay, or have I already missed the window?" — the operational inflection between *applied pesticide* and *pesticide that actually controls the target*. The weather varia

Topdressing Rates — UK Greens

Concrete seed values for **annual topdressing tonnage, sand-blend specification, and organic-matter targets** on UK greens, surfaced as named-club examples by four UK course managers in BIGGA's multi-supe piece (originally published Spring

Withdrawn Actives — UK Greenkeeping Reference

A **reference inventory** of the four major active ingredients withdrawn from UK greenkeeping use in the late-2010s — what each controlled, why it was withdrawn, and the cultural / non-chemical alternatives that replaced each. The entry exi