As a soil-borne fungus, it's present at all times, even deep winter. Although black-eyed Susans are also called coneflowers because of their cone-shaped heads, they should not be confused with purple coneflowers (Echinacea purpurea). I now water our black-eyed Susan sparingly, only on the hottest days and always in the morning. Thanks for the share and the votes. For that vertical accent in borders, try black-eyed susan vine, as it twines up any available support,with handsome leaves and ample flowers. Jill Spencer (author) from United States on June 01, 2013: Hi faythef. Hi Eddy! It's like an epidemic! Black-eyed Susan is a fast growing vine that needs a vertical stand or trellis to support the plant. If your plants are in a wet area, that exacerbates wilt. Jill enjoys cooking, abstract painting, stewardship & learning about gardening through the MD Master Gardener & Master Naturalist programs. Jill. They tend to blanket open fields, often surprising the passerby with their golden-yellow beauty. 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. It's almost too hot here to go outside, but I'm going to anyway. Rebecca Mealey from Northeastern Georgia, USA on June 01, 2013: I just love black-eyed susans. Your remaining plants may develop some rust anyway, but if you're like me, you may not mind a little damage, right? Again, since the spots are mainly cosmetic, this may be a wasted effort if you don’t mind spotty foliage. The clumps in our neighbors' yards and in the parks and public gardens where I volunteer were also suffering from rusty leaf spots and shriveled stalks that looked almost burnt at the bottoms. Becky Mix. You could always plant them elsewhere in your garden. Do not use sprinkler irrigation. They produce black spots on shastas. Answer: It sounds as if some sort of pathogen is at play, perhaps Sclerotinia Sclerotiorum and Sclerotium Rolfsii. Removing spent foliage will help in small plantings, since it removes spore sources, but this is often impractical due to the nature of prairie plants. Answer: A milk/water fungicide has shown some effect on powdery mildew. Black-eyed Susan has a tendency to spread, particularly when it's in the sort of location it likes: full-sun and rich, well-drained soil. The legend says that the name black-eyed Susan originated from an Old English Poem written by John Gay entitled‘Sweet William’s Farewell To Black-Eyed Susan’. I have reported it twice, recently maybe 3-4 days ago because of how quickly it became root-bound in the other container (But it was flourishing). Peggy Woods from Houston, Texas on June 13, 2013: These are some great tips. Dora Weithers from The Caribbean on June 13, 2013: Just the information I need about getting rid of fungus. One thing I noticed this spring is my shasta daisies all have white spots on them. Rudbeckia Fulgida, commonly known as Orange Coneflower is a perennial native to the Eastern United States and Canada. Yellow coneflower, perennial black-eyed Susan related varieties: Goldsturm is the plant usually offered by nurseries. Final Spacing: 8" Water Use: High Water Use Once you do, it takes time and patience to get rid of it without using any sort of fungicide, organic or otherwise. The foliage looks paler this year too. Whether you decide to leave the plants where they are or pot them, be sure to remove the infected parts and destroy (don't compost) them. With its masses of yellow daisies, each with a black central cone, it brightens up our plantations from late July to late September, attracts bees, birds and butterflies, makes an excellent cut flower, and is very hardy (zone 3). Spotted leaves on black eyed Susan appear where fungal spores have been allowed to overwinter and conditions were right for reinfection in the spring. Rudbeckia hirta generally grows in clumps anywhere from one to two feet wide. 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. When the plant is dug up the roots appear blackened, rotten and covered with white fungal threads. Hope you have a wonderful week too. Black spots on Rudbeckia, also known as black eyed Susan, are very common and occur in a large percentage of the population each year. Gardening Challenges In The Texas Panhandle, Adding Unique Texture and Dimension to Flower Beds with Succulents. This look exactly like what is one of my sedums. The.. Deb Hirt from Stillwater, OK on June 02, 2013: I love these flowers. I will be referencing this later today after these wicked storms have passed. Similar Images . This content is accurate and true to the best of the author’s knowledge and is not meant to substitute for formal and individualized advice from a qualified professional. It sounds like your black-eyed Susan's have a mildew or fungus. This pathogen typically causes leaf spots with downy white or gray patches under the leaves. Question: My black-eyed Susans are very small but popping out and already have black spots. These methods for preventing mildew, gray mold and rust on Rudbeckia hirta plants are aimed at keeping moisture around the plant down (mold, fungi and rust love moisture) and lessening the spread of the spores that cause infections. The flowers look daisy-like at a distance, but they are actually tubular. There are many causes, but the most common by far is the fungal disease called Septoria leaf spot, a common disease of tomatoes. Or, periodically remove the small plants that form from rhizomes next to the main clump. What to do, without resorting to chemicals (which I adamantly refuse to use)? With their brown button centers and bright yellow petals, Rudbeckia hirta flowers (commonly called black-eyed Susan) are cheery additions to informal gardens, landscaping islands, mailbox gardens, and borders. Diseases caused by Fungi: Downy mildew, Plasmopora sp. The flowers look lovely. Yes, it does sound like your daisies have fungus. Of course, you could use an old galvanized can and water from the rain barrel if you want to make the whole process as back-breaking as possible. Who doesn't love the cheery faces of Rudbeckia hirta flowers? Question: All my black eyed Susan’s have this and all over. Picked off all affected leaves this year. Snails and slugs; Aphids; Rust; Leaf spot Thank you for the tips..Mine too are suffering from the same problems..voting up and sharing. My roses look awful too. All the best, Jill, voted up across the board - as always thanks for good information and well written. The blooms on this option that does well in zone 5 to 9 can be up to 4.5-inches in diameter. Rudbeckia hirta should grow there. It takes time & patience to get rid of it, that's for sure. Spots may remain round or develop more of an angular look when they run into leaf veins. Avoid using harsh chemicals in your garden with these 7 tips. --Jill, Rebecca, you're going to have to get some black-eyed Susan, girl! Fortunately, none of these leaf spots are serious and can be treated with the same chemicals, making identification more of an intellectual exercise than a necessary step. It’s now affecting other plants like my shasta daisies. I've had this beautiful vine for 2 months now and it's grown great. A leaf severely infested with rudbeckia leaf spot. Will this helps me with rudbekia? In fact, it probably would have. Not only do they hold moisture, but they also attract pests. You want there to be enough room around each plant so that air can circulate. If, despite your best efforts, the Rudbeckia hirta in your garden becomes infected with rust, mold or mildew, remove infected stems and leaves, both from the plant and the ground. Hi Barbara, I hope your black-eyed Susan don't get it, too. My black eyed Susan’s are not in bloom yet but some of the new leaves are shriveled and there is sometime inside that is black kind of grainy about the size of a pea. This concoction is usually only used on vegetable gardens because it has an unpleasant odor. There are also red, salmon and ivory flowered varieties. You don't need those, too! Take care, Jill. May 23, 2015 - Add a pool of sunshine to the garden with a massed planting of black-eyed Susan. Until two years ago, when our lovely clumps of black-eyed Susans were plagued by rust, gray mold, and mildew. After all, Rudbeckia hirta is naturally prone to rust, gray mold and mildew infections. Although thick masses of black-eyed Susan in the shade are pretty at first, the size and location are an invitation to disease. Apart from being susceptible to white powdery mildew, black-eyed Susan’s are resilient plants. removing any and all infected plant parts. First time last year. Jill Spencer (author) from United States on June 03, 2013: Hi azrestoexp! Good luck to you! Remove them all but cutting everything off or digging them up? I love the black-eyed Susan but don't think they grow in Phoenix. Glad the hub is helpful to you & thanks for sharing it. This would take care of the problem if it's a pest. Soil texture and pH preferences, if any, are unknown. Arizona's Restoration Experts, LLC on June 03, 2013: Nice hub. They're adorable! Fortunately, our plants didn't die from their infections, but they looked like they wanted to! The flowers have an almost pop art look to them, with a solid center surrounded by a ring of clear colored petals. 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