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This article is a list of diseases of hydrangeas (Hydrangea macrophylla ... Pseudomonas solanacearum: Bacterial leaf spot Pseudomonas cichorii: Fungal diseases ...
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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.
The Southern states fall nicely within the winter hardiness zones of hydrangeas, which range from USDA zones 3 to 9 for panicle and smooth hydrangeas, and zones 5 to 9 for bigleaf and oakleaf ...
Alternaria black spot of canola or grey leaf spot is an ascomycete fungal disease caused by a group of pathogens including: Alternaria brassicae, A. alternata and A. raphani. This pathogen is characterized by dark, sunken lesions of various size on all parts of the plant, including the leaves, stem, and pods.
Hydrangea flower color changes based on the pH in soil. As the graph depicts, soil with a pH of 5.5 or lower will produce blue flowers, a pH of 6.5 or higher will produce pink hydrangeas, and soil in between 5.5 and 6.5 will have purple hydrangeas. Hydrangea flower color can change based on the pH in soil.
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Sporotrichosis by the fungus Sporothrix schenckii. Cutaneous or skin sporotrichosis; This is the most common form of this disease. Symptoms of this form include nodular lesions or bumps in the skin, at the point of entry and also along lymph nodes and vessels.