![]() ![]() You can also apply the fungicides chlorothalonil or thiophanate-methyl. If your hydrangeas do get infected, you have several options, including compost tea, hydrogen peroxide, garlic oil, or liquid kelp. Watering without getting the leaves wet will help to prevent these diseases. As the lesions get larger, the leaves can turn yellow and fall off the plant. Leaf Spots ( Cercospora species and Phyllosticta hydrangea)Ĭercospora manifests as circular purple or brown spots on the bottom of the plant. Options include iprodione, or thiophanate-methyl. If you have a persistent problem, you may need to use fungicides. Clean up debris around the plant, so that Botrytis can’t live on the dead tissue. Treat your pruning shears with bleach as you prune, so you don’t accidentally spread any disease.Īlso remove dead or damaged flowers and leaves to prevent the fungus from gaining egress into the plant. Space them properly, and prune branches that are closely spaced. If you can, keep good airflow around your plants. Don’t water late in the day, and only water at the roots, so you don’t get the flowers and leaves wet. You can take steps to try and prevent this infection. The reddish lesions on the leaves are a sure sign of Botrytis Blight.īotrytis is more likely to be a problem under cool and damp conditions, such as several days of cloudy, humid, and rainy weather. However, these grow into reddish brown lesions. The first symptoms are water-soaked spots on the flowers. In addition, infected flower parts can fall on the leaves and infect them. This fungus can severely affect the flower buds and even kill them before they open. Bacterial Leaf Spot (Xanthomonas campestris)įungal Diseases Botrytis Blight ( Botrytis cinerea).Bacterial Wilt (Ralstonia solanacearum).Anthracnose (Colletotrichum gloeosporioides).Leaf Spots (Cercospora species and Phyllosticta hydrangea).
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