Grey to white powder on leaves and stems. Leaves will turn yellow, then tan or brown. Improve air circulation and reduce shade by pruning trees. Lawns turn light green or yellow and thin out. Yellow to brown spots on leaves in late summer.
Orange powder rubs off.
Fungus - most active during moist, warm weather. Heavy dew favours disease. Maintain vigorous growth with Nitrogen fertilizer and water. Chlorothalonil or Maneb may be applied at 5 day intervals for 3 applications. Read and follow label directions.