What visible condition do downy mildew infected leaves often exhibit?

Downy mildew is a plant disease caused by specific water molds that affect a variety of plants. Infected leaves typically exhibit a characteristic striped appearance, which is a result of the pattern in which the disease develops on the surface of the leaves. This appearance is due to the uneven growth and chlorosis (the loss of green color) that occurs in infected areas, often leading to a distinct mottled or streaky appearance.

Additionally, the infection can lead to sterility in some plants, impacting their reproductive capabilities and overall health. The symptoms can progress to include additional signs like fuzziness on the underside of the leaves where the spores develop, contributing further to the visual cues for diagnosis.

The other options do not accurately represent the common symptoms associated with downy mildew. For example, bright green tips or foul odors are not characteristic of this disease and are more indicative of different issues. Thickened leaf edges may be associated with other types of plant stress or disease but are not typical for downy mildew. Understanding these distinct symptoms is crucial for effective identification and management of plant diseases.