For black spot disease I’ve successfully been using a combination of Liquid Systemic Fungacide II and Mancozeb. Recently I’ve not been able to locate Mancozeb so hoping someone has an additional “formula” that works. Thank you for your thoughts……
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Where do you live? Go to Amazon and get some Manzate Pro-Stick it is on sale, 6 pounds, powder. 1 Tablespoon per gallon dissolve in a different container before mixing in your spray tank. I use it every time I spray.
Perfect……thank you very much
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You might look into rotating with chlorothalonil or a copper-based fungicide if Mancozeb is unavailable in your area. A lot of rose growers have had decent results alternating a systemic product with a contact fungicide to help prevent resistance buildup.
Good sanitation also makes a huge difference with black spot removing infected leaves, improving airflow, and avoiding overhead watering can reduce pressure quite a bit.
I’ve also heard some people are having success with biofungicides like Serenade, though results seem more variable depending on climate and severity.
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Go to Amazon.com or contact your local feed & seed store, look for Manzate T&O, it comes in a 6 pound bag, use 1 tablespoon/gallon. Or also search for SouthernAg’s Dithane which is also Mancozeb. Or Pentathlon DF, but it is more expensive. Unfortunately you cannot buy Mancozeb in all states.