Turfgrass Pest Management Category 3A Practice Test

Powdery mildew presents as a dull white, powdery coating on leaf surfaces, like flour dust on the blades. This fuzzy bloom is a fungal growth that often starts on the upper leaf surface in humid, warm conditions and can rub off with touch. As it progresses, the leaves may look washed out or slightly distorted, and severe infection can reduce photosynthesis and turf vigor. The other described appearances—bright green patches, purple spots, or yellow halos—do not match powdery mildew and are more typical of other diseases or disorders. The white, powdery bloom on the leaf surface is the key identifying feature.