Turfgrass Pest Management Category 3A Practice Test

Blight (Typhula) occurs under snow cover for 3 or more months. What is the typical symptom?

Irregular yellow patches White fuzzy growth at base Circular gray spots Purple stripes

Correct Answer:

Circular gray spots

Explanation:

Under long snow cover, Typhula blight forms a very recognizable pattern: circular patches of dead turf that look gray once the snow starts to melt. The fungus grows as a dense white-to-gray mycelial mat under the snow and, when conditions warm a bit, these patches become visible as circular gray spots on the turf. This circular, gray symptomatic mold is the classic sign of gray snow mold caused by Typhula, distinguishing it from other stress symptoms like irregular yellow patches from drought or nutrient issues, white fuzzy growth at the base from different molds, or unrelated patterns such as purple stripes.

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