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E-GRO Alert: Powdery mildew on calibrachoa

May 14, 2015  By Nora Catlin Cornell University

May 14, 2015 – Powdery mildew can often go unnoticed on calibrachoa. Check your plants for white, powdery, fungal growth – usually on the lower foliage and sometimes accompanied with leaf discoloration and leaf drop.

There are a few reasons powdery mildew often is overlooked in calibrachoa crops: symptoms typically first develop on the lower leaves and can be easily missed if plants are not carefully inspected, the powdery fungal growth can be subtle and difficult to see in some cases, many cultivars are not affected by the disease, and symptoms can go unnoticed in baskets until they are taken down for sale.

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