Pansies can suffer from rust or beet yellows, both of which….

Discolor leaves and can stunt plant growth. Soil-borne diseases can be avoided by using sterilized soil, following care guidelines, and avoiding injuries to plants while transplanting or planting. These diseases include root and crown rots, and downy mildew. If your plants show disease signs, remove any affected leaves or flowers, and apply pesticides if needed.