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Bruce B. Clarke
Rutgers University
New Brunswick, NJ USA
Managing Pink Snow Mold Disease on
Golf Courses
SNOW MOLDS AND BLIGHTS
Pink Snow Mold Microdochium nivale
Fusarium Patch Microdochium nivale
Gray Snow Mold Typhula incarnata,
T. ishikariensis
Snow Scald Myriosclerotinia borealis
Cottony Snow Mold Coprinus psychromoribidus
Frost Scorch Sclerotium rhizodes
Pythium Snow Blight Pythium graminicola,
P. vanterpoolii
Pink Snow Mold and
Fusarium (Microdochium) Patch
Pathogen: Microdochium nivale (Fusarium
nivale)
Grasses Poa annua , Agrostis stolonifera,
Affected: Poa pratensis, Poa trivialis, Lolium
perenne, Festuca arundinacea,
Festuca rubra
Fusarium (Microdochium) Patch
Symptoms Visible in spring and fall during
and Signs: cool, moist conditions. Common on
annual bluegrass and bentgrasses
as pale yellow to reddish brown
patches initially 3 - 5 in (7-13 cm)
enlarging up to 12in (30 cm) dia.
Infection centers may coalesce into
large areas. White, fluffy, mycelium
at advancing margin, with slimy,
orange to pink, spore masses.
Severe damage to leaves and crown,
natural recovery slow.
Pink Snow Mold (PSM) and
Fusarium (Microdochium) Patch (FP)
Conditions Favored by wet conditions, high
Favoring humidity and air temp. from 0-
Disease: 12 °C (32-55 F). Prolonged snow
cover on unfrozen ground ideal for
PSM, but necessary for FP. More
severe when soil pH is neutral or
alkaline. Lush, succulent growth
in fall is very susceptible.
Cultural Control of Snow mold
♦ Avoid fall fertilization that would encourage lush growth in
mid- to late-October (use slow release N).
♦ Reduce soil pH below 7.0 whenever possible (acid fertilizer)
♦ Maintain adequate K in late-fall to increase cold tolerance
♦ Reduce compaction/improve drainage (important in spring)
♦ Remove tree leaves and mow until dormancy
♦ Use snow fences to prevent excess snow accumulation
♦ If covers are used on greens, treat turf with fungicides
prior to installation.
♦ Lightly fertilize (25 kg N/ha; 0.5 lb/M) in spring for recovery.
Chemical Control of Pink Snow Mold
I Aromatic Hdrocarbons : PCNB
II Benzimidazoles : Cleary 3336, Fungo
III DMIs : Banner, Tourney, Trinity, Torque
IV Dicarboximides : Chipco 26GT, Fungicide X
V Nitriles : Daconil, Echo, Concorde
VI Strobilurins : Compass, Heritage, Insignia
(two applications may be required in areas with a history of heavy snow mold – October and November; reapply in January if snow melts)
0
10
20
30
40
50
60
70
80
90
100
1 2 3 4 5
# P
atc
h/p
lot
Pink / Gray Snow Mold : CBG Green - Pullman, WA
1. Turfcide 400 7.5 fl oz 4. Banner MAXX 1.3ME 2 fl oz
2. Compass 0.25 fl oz 5. Non-treated check
3. Medallion 50WP 0.5 oz F & N 56: T11 (2000)
a a a a
b
0
10
20
30
40
50
60
70
80
90
100
1 2 3 4 5 6
% D
ise
as
e
Pink Snow Mold : KBG Fwy – Pullman, WA
F & N Tests 55:515 (1999)
a a
ab b
c c
1. Chipco 26GT 2SC 4 fl oz
+ Terraclor 75W 4 oz
2. Chipco 26GT 2SC 4 fl oz
+ Heritage 50WG 0.4 oz
3. Chipco 26GT 2SC 4 fl oz
+ Daconil Ultrex 82.5W 4 oz
4. Chipco 26GT 2SC 4 fl oz
5. Terraclor 75W 4 oz
6. Non-treated check
0
10
20
30
40
50
60
70
80
90
100
1 2 3 4 5 6
% D
isease
Pink / Gray Snow Mold : CBG Fwy - British Columbia
1. Heritage 50WG 0.8 oz
+ Banner 1.1EC 4 fl oz
2. Heritage 50WG 0.4 oz
+ Daconil Ultrex 90WG 5.3 oz
+ Terraclor 75W 2.1 oz
3. Heritage 50WG 0.8 oz
+ Terraclor 75W 5.6 oz
4. Terraclor 75W 8.8 oz
5. Heritage 50WG 0.4 oz
6. Untreated control
a
b
c
d d d
F & N Test 58 : T058 (2001)
Manchester CC VT
North Adams CC, MA
Berkshire Hills CC, MA
Glens Falls CC, NY
2010-11 Umass Snow Mold Sites
Snow Mold Control with Mixtures – Wi & NY
% disease area Mixture of Pink & Gray
Snow mold - G. Jung
Renown (chloro. + azoxy.)
Concert (chloro. + propic.)
Civitas treatments
% disease area Mixture of Pink & Gray
Snow mold - G. Jung, UMASS
16 oz/M Civitas 0.75 oz/M Propiconazole
32 oz/M Civitas 1.5 oz/M Propiconazole
32 oz/M Civitas 1.5 oz/M Propiconazole
5 oz/M Chlorothalonil 0.25 oz/M Medallion 3 oz/M Propiconazole
Recovery from Snow Molds
Berkshire Hills CC
Snow mold rating on March 28, 2011
Recovery rating on April 21, 2011
Civitas 16 oz + Harmonizer 4 oz
Civitas 16 oz + Harmonizer 4 oz + Concert 4 oz
Turfcide (8 oz/M)
Untreated
Chemical control
• Two- or three-way combinations of products due to multiple snow mold species
– DMI, Strobilurin, Iprodione, Chlorothalonil, Fludioxonil, Thiophanate-methyl, Polyoxin-D
