Purple Blotch

Purple blotch appears as purple-colored lesions on leaves and stems of affected plants. This fungal disease favors cool, wet conditions. Remove infected foliage and improve air circulation. Avoid overhead watering. Apply fungicides preventively during favorable infection periods. These leaf-spotting diseases are most active in cool, wet conditions. Remove infected foliage and improve air circulation Early detection and prompt management of symptoms help limit disease spread.

Leaf spot and blotch diseases are primarily cosmetic on established plants, though repeated years of heavy infection can weaken them. Rake up and remove fallen leaves to reduce the spore load going into the next season. Avoid overhead watering that splashes spores from the ground onto lower leaves. If the problem is severe, protective fungicide sprays during spring leaf emergence can help, but sanitation does more than chemistry for most leaf spots.