[78+] Red Spots On Hydrangea Stems

Heavier infestations call for spraying with ready to use non toxic insecticidal soap. Macrophylla hydrangea plants are the ones that are most commonly afflicted by these red spots and they are the ones where the spots tend to be the most noticeable.

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Spots on hydrangea leaves are usually a leaf spot fungus and this is caused by frequent splashing of water on the foliage. Red streaks may form on stems. In most cases these leaf spots are indicative of cercospora leaf spot a temporary condition caused by the fungus cercospora hydrangea which is perhaps the most common disease seen on hydrangeas during the months of july through october.

Rust spores are spread in water or on the wind so avoid splashing your plants when watering. This fungal disease looks like round orangish spots on the underside of hydrangea leaves. Sooty mold persists as long as your hydrangeas host the waste producing insects.

Gray mold a fungal disease caused by botrytis paeoniae symptoms include brown to black spots on foliage and flower petals. As the disease progresses flower buds may turn gray and fall off and fluffy gray spores will appear on foliage and flowers. Using soaker hoses rather than sprinklers or spray nozzles can help.

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