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"Orange spots that form on the bottom or the underside of the leaves are hydrangea rust," read Epic Gardening's hydrangea guide. "The top of the leaf will turn yellow and the leaf will eventually die.
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This article is a list of diseases of hydrangeas (Hydrangea macrophylla ... Pseudomonas solanacearum: Bacterial leaf spot Pseudomonas cichorii: Fungal diseases ...
Stegophora ulmea is characterized by chlorotic yellow spots 1 millimeter in diameter with a black center that develop early in the spring. [1] [2] [4] They darken and become raised. The black center can increase to occupy the entire chlorotic area. [4] The black spots can become about 5 millimeters in diameter. [1]
One commercially relevant plant genus that can be affected by Alternaria Leaf Spot is Brassica, as the cosmetic issues caused by symptomatic lesions can lead to rejection of crops by distributors and buyers. [5] When certain crops such as cauliflower and broccoli are infected, the heads deteriorate and there is a complete loss of marketability.
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