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It will work very well as a preventive measure and as baking soda contains salts, you should never use it in higher concentrations. If that fails and you don't want to keep spraying, replace the diseased black-eyed susans with another species, such as daylilies, coreopsis, salvia or gaillardia. The disease shows up as irregular black spots on the leaves. md581877. You might also try dividing and spacing out your plants a little. Chlorothalonil (Daconil) is a common fungicide that's effective for this leaf spot disease. Try new black-eyed susans (fresh ones, don't move your diseased ones) in a different bed, or give the disease about 3 years to die out in the soil and replant with susans then. Spray the infected black-eyed Susans with the fungicide every seven days until the disease subsides. wide through the summer. mschik Arlington Heights, IL Jul 05, 2020. It happened last year when it was first planted and I figured it would go away in subsequent years. Black-eyed susans got spots and turned black Leaf spot is a common fungal disease on black-eyed susans this time of year, but it's too late to do much about it now. This would reduce the moisture that encourages fungal disease. Sign up for our newsletter. Quote. Black spots on Rudbeckia, also known as black eyed Susan, are very common and occur in a large percentage of the population each year.There are many causes, but the most common by far is the fungal disease called Septoria leaf spot, a common disease of tomatoes. Community Rules apply to all content you upload or otherwise submit to this site. Black eyed Susans are surprisingly drought-tolerant after they become established. Q. Tight spacing, overhead watering and high humidity contribute to the spread of these leaf spot diseases – the very nature of these plants makes breaking the disease cycle difficult. I've been treating them with a fungicide, but it just gets worse and worse. Q. black spots on my rudbekia (black eyed susan) leaves. These are two primary diseases that cause black-eyed Susan leaves to get black spots that progress to black blotches and sometimes totally black leaves. The first step is to deadhead your roses. Quote. How To Treat Black Spots On Roses Organically. These can suck up nutrients from the healthy parts of your plant. For Angular Leaf Spot copper fungicides have been effective. Transfer the diluted neem oil to a clean handheld sprayer or pump sprayer. I have a lot of black eyed susans, live in the the northwest and have never seen the black on the leaves so I am intrigued. You like many gardeners are finding the once low maintenance Black-eyed Susan (Rudbeckia) to be a disease ridden plant. Growing Black Eyed Susan Vines: How To Propagate A Black Eyed Susan Vine, Guide To Rudbeckia Deadheading – How To Deadhead Black Eyed Susans, DIY Flower Pot Christmas Tree: Making A Terra Cotta Christmas Tree, Christmas Tree Allergen Info: Am I Allergic To My Christmas Tree, Seniors And Houseplants: Indoor Senior Gardening Ideas, What Are Navel Orangeworms: Controlling Navel Orangeworms On Nuts, Mandarin Orange Tree Care: Planting A Mandarin Orange Tree, Pomelo Tree Care – Pummelo Tree Growing Information. Black Eyed Susan Leaf Black/brown Spots - my plants look lush and green but get dark brown spots on the leaves. If you want to know how to transplant black eyed susans, you’ll be pleased that it only takes three steps. Depending on the variety, perennial black-eyed Susans will thrive in USDA growing zones 3 to 9 (with most cultivars happiest in zones 4 to 7). 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