Versions of this presentation given at:

the Northeastern APS Meeting in Bromont, Quebec, 4 October 2002.

New York State Turfgrass Association meeting at Lake Placid, New York, 4 March 2003

Biology & Management of Snow Molds

Dr. Tom Hsiang

University of Guelph

Guelph, Ontario, Canada

Winter injury

Winter injury

Winter injury or snow mold damage?

Snow molds

Snow molds

Snow mold capital

One of the seven wonders

Photo of the seventh wonder

Snow molds

Snow molds

Pink and gray snow molds

Gray snow mold

Gray snow mold on perennial ryegrass

Gray snow mold on Kentucky blue

Gray snow mold on Kentucky blue

Gray snow mold on creeping bentgrass

Gray snow mold on creeping bentgrass

Gray snow mold on creeping bentgrass

Gray snow mold on creeping bentgrass

Gray snow mold on creeping bentgrass

Gray snow mold (Tish sclerotia on CB)

Gray snow mold (Tish sclerotia on CB)

Gray snow mold (Tish sclerotia on CB)

Gray snow mold (Tish sclerotia on CB)

Gray snow mold (Tish sclerotia on CB)

Gray snow mold (Tish sclerotia)

Gray snow mold (Tish sclerotia on CB)

Gray snow mold (Tinc sclerotia on PR)

Gray snow mold (Tinc sclerotia on PR)

Gray snow mold (Tinc sclerotia on CB)

Gray snow mold (Tinc sclerotia on KB)

Gray snow mold (Tinc sclerotia)

Gray snow mold (Tinc sclerotia)

Gray Snow Mold

Disease Triangle

Gray Snow Mold: Diagnosis

Mycelium, hyphae, hair

Microscopic views

Gray snow mold life cycle

Pink or gray snow mold?

Pink snow mold

Pink snow mold on creeping bentgrass

Pink snow mold on Kentucky blue

Pink snow mold on creeping bentgrass

Pink snow mold on creeping bentgrass

Pink snow mold on perennial ryegrass

Pink snow mold

Pink snow mold on creeping bentgrass

Pink snow mold on creeping bentgrass

Pink snow mold - pink foliage of KB

Pink snow mold - sporodochia on KB

Pink snow mold - sporodochia

Pink snow mold - spores

Pink snow mold - disease triangle

Pink snow mold - diagnosis

Pink snow mold on which host?

Pink Snow Mold

Question

Pink or gray snow molds

Pink or gray snow molds

Question

Snow mold differences

Snow molds or winter injury?

Snow mold control

Snow mold control (general)

Snow molds - chemical control

Snow molds & missing fungicide

Snow molds - chemical control

Snow molds - chemical control

Snow molds - chemical control

Snow molds - cultural controls

Snow molds - cultural controls

Snow molds - cultural controls

Snow molds - cultural controls

Greens Cover

Greens Cover

Greens Cover - 2 weeks later

Greens Cover

Snow molds - greens covers

Snow molds - cultural control

Snow molds - cultural controls

Snow molds - recovery

Snow molds - recovery

> 70% OK

< 50% oh-oh

Snow molds - disease resistance

Snow molds - biological control

Snow molds - biological control

Corn stubble after winter

Typhula phacorrhiza sclerotia

TP objectives (1994-1998)

Sample sites in Ontario

Applying inoculum

At snowmelt

Results

gray snow mold TP treated

Objectives (1998-2004)

Registration Package

Registration Package

Rocky Mountains Site II (May, 2000)

Rocky Mountains Site II, TP trial, May 2000

May 2000. Green plots treated with TP

Summary of Results

Summary of Results

Summary of Results

Future Research

We hope to have a product for the turf industry within two years