Rust
 Fungus
Puccinia
Symptoms
Thin, weakened turf that appears covered with an orange-red or yellow powdery dust.
Powder will discolor shoes and clothing.
Grasses susceptible
All cool season turfgrasses, especially perennial ryegrass.
Conditions favoring disease
Warm nights (68-86 degrees F/ 20-30 degrees C), wet leaves, and low light areas (shady sites or cloudy weather).
Most severe mid to late summer into fall when turf is not actively growing or under stress.
Cultural Options:
Maintain adequate fertility.
Minimize leaf wetness.
Avoid drought stress (proper watering).
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