The dead areas have distinct black margins. The petals of infected flowers are abnormal or spotted. Severely infected plants may be killed. Several leaf spots may be seen and are controlled by picking off infected leaves.
Powdery mildew cause a white powdery growth on the leaves.
The disease called scab is also called spot anthracnose or pansy scab. Symptoms are circular to elongated lesions, one fourth inch in diameter, on all parts of the plant. The spots may be yellowish brown, rose colored, or whitish. Darker green zones may surround the spot. The diseased areas fall out giving a shothole appearance.