This text provides a comprehensive guide on fungicides for hydrangeas, focusing on their early stages and their effectiveness in preventing common diseases like leaf spot fungus, botrytis blight, and anthracnose. It emphasizes the importance of following application instructions and choosing the right fungicides for hydrangeas. Fungicides containing chlorothalonil, copper, triticonazole, or propiconazole are most effective when applied before symptom development to prevent infection. Reapplying every 10 to 14 days may be necessary to prevent these diseases.
A broad-spectrum and basic fungicide like Carbendazim (Bavistin) is used to control powdery mildew, black spot, and other fungal outbreaks on hydrangeas. A copper-based fungicide like Bonide Copper Fungicide is recommended for treating fungus on hydrangeas, which should be applied to the leaves and stems every two weeks. Fungicides containing chlorothalonil, mancozeb, or thiophanate-methyl are most effective when applied prior to the first sign of leaf spots and to protect newly formed hydrangeas.
Fungicides with active ingredients like copper octanoate or copper soap, sulfur, or neem oil can biologically control fungus on hydrangeas. If further treatment is needed, horticultural oil like neem can be used. Fungicides like Bonide Fung-onil or propiconazole are available for use.
📹 Hydrangea Disease Control
📹 Q&A – Why does my hydrangea have brown dark spots all over?
This is cercospora leaf spot which is fungal. UT Extension Agent Chris Cooper says will not affect the plant, it only looks bad.
Add comment