Cherry Powdery Mildew

Healthy tart cherry terminal (left), infected terminal (right). Notice characteristic upward curling, whitish appearance of infected leaves compared to healthy leaves.


Micrograph of sexual stage of the causal agent. Dark structure is the cleistothecia. Clear round structure is the ascus containing 8 ascospores.

Peach Powdery Mildew

Powdery mildew lesions on nectarine. Notice the circular well defined borders of the lesions.


Powdery mildew infected nectarine fruit and leaf. Infected leaves become puckered and distorted. Infected fruit will also be distorted, the severity of the distortion is reliant on when the fruit became infected.

Rusty Spot

Indeterminant rusty spot powdery mildew lesions on young peach fruits.