Gray Snow Mold

Question 1

Gray Snow Mold

**Cause: **

Answer 1

– Typhula incarnata
– Typhula ishikariensis

Question 2

Gray Snow Mold

Host:

Answer 2

– Agrostis spp.
– Festuca spp.
– Lolium spp.
– Poa spp.

Question 3

Gray Snow Mold

Symptoms:

Answer 3

• Large patches of silver/gray, matted down turf grass that coalesce

Question 4

Gray Snow Mold

Disease Cycle:

Answer 4

Sclerotia survive in thatch….when conditions are favorable, they germinate into mycelium and form basidia and basidiospores. The basidiospores spread rapidly and form more sclerotia.

Question 5

Gray Snow Mold

Signs:

Answer 5

• White to gray Mycelium is often present
• Has clamps on mycelium
• Red, spherical sclerotia are on blighted leaves.

Question 6

Gray Snow Mold

Predisposing Conditions / epidemiology:

Answer 6

• Cold 35°-Warm 50°F Optimum temperature= 35°F
• Extended leaf wetness
• Thatch buildup
• Historical trouble spots
• Excess levels of N going into dormancy
• **SNOW **

Question 7

Gray Snow Mold

Management Tactics:

Answer 7

• Keep snow off
• Keep turf dry
• Maintain a balanced fertility program
  – soil test and adjust levels of nutrients as necessary
• Maintain adequate N inputs in season
  – 3 to- 5 lb. per 1000
  – avoid excess N going into dormancy

Question 8

Gray Snow Mold:

Chemical Control:

Answer 8

• Best Chemical option is quintozene (PCNB)

Question 9

Gray Snow Mold

Cause:

Answer 9

• Typhula incarnata
• Typhula ishikariensis