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There are few flowers as iconic as the black eyed Susan these noble and tough prairie flowers capture the hearts and minds of the gardeners who grow them, sometimes in droves. There are many causes, but the most common by far is the fungal disease called Septoria leaf spot, a common disease of tomatoes. Apply fungicides according to label directions. Read more articles about Black Eyed Susan. A: That's actually a fairly common disease on black-eyed susans cleverly called "leaf spot," and it usually is at its worst in warm, humid weather (i.e. Learn more about this in (usually every 10-14 days). This would reduce the moisture that encourages fungal disease. Black eyed Susan disease is a fungal spore that infects the plant and causes unsightly black spots and low leave count. To maintain proper spacing for good air circulation, youll have to aggressively pull volunteer seedlings that spring from the many seeds Rudbeckia produce in the fall. This flower should also be kept away from small children, who may chew it or get the sap on their skin.they are poisonous to most Q. black spots on my rudbekia (black eyed susan) leaves. Spray the infected black-eyed Susans with the fungicide every seven days until the disease subsides. Then this year they developed black spots and kind dried up, leaf wise. Chlorothalonil (Daconil) is a common fungicide that's effective for this leaf spot disease. 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. Aphids suck sap from black-eyed Susans, while goldenglow sawflies may defoliate the entire plant. Can You Darken A Tree Thats Been Sun Bleached? 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. Nothing is as breathtaking as their bright flowers, and nothing as devastating as finding spots on them. Community Rules apply to all content you upload or otherwise submit to this site. Several leaf spots diseases can cause the symptoms you described. plants bloom well, but the leaves Q. Top Questions About Black Eyed Susans. To reduce the impact of the disease in the years to come, here are a few simple things you can do: Buy healthy plants and certainly avoid plants with dark leaf spots. Prevention Next Year. 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. These spots are primarily a cosmetic disease, though plants with many infected leaves may die back slightly earlier than non-infected plants. Proper spacing of plants helps avoid mildew from appearing, but Organic gardeners can use copper-based fungicides. Transfer the diluted neem oil to a clean handheld sprayer or pump sprayer. It may also be dangerous to cats, dogs and other household pets. Black-eyed Susan (Rudbeckia spp.) md581877. Black spots on Rudbeckia, also known as black eyed Susan, are very common and occur in a large percentage of the population each year. Water them only once or twice each week during dry spells from the second year on. The plant will continue to grow but unless a fungicide is applied or the leaves are removed, the spores will continue to infect the plants. Management for both Septoria leaf spot and Angular leaf spot are the same. Fungicides can keep a lid on it, but the key is getting these sprays on at the onset of the disease and keeping the leaves treated as long as the weather is ripe for fungal growth. I have a large flower bed with lots of black eyed susans. 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