The entire plant may die. There are way few flowers now. Rudbeckia is a perennial plant also known as black-eyed Susan, yellow oxeye daisy, English bulls-eye, Gloriosa daisy, and coneflower. My research has found 1 post on 1 forum with identical photos with no answers I've seen a lot of different bugs on the plants but nothing consistent or numerous. starting as 1/8-inch-diameter spots but quickly merging to cause large brown areas on otherwise dark green leaves. That said, Black-eyed Susan (Rudbeckia) tends to contract a disease called Septoria Leafspot. Rudbeckia hirta - Black-Eyed Susan is a popular biennial or a short-lived perennial wildflower species that typically grows about 0.5 m in height. Black-eyed Susan (Rudbeckia hirta), which grows in U.S. Department of Agriculture plant hardiness zones 2 through 11, is a cheerful, sunny addition to the backyard wildflower garden. Spots on Leaves of Black Eyed Susan. Sometimes it is just a certain part of the plant that irritates, like the sap of Euphorbia or the roots of hyacinth. Although, for some extremely sensitive people, any part of a plant they are affected by can cause irritation. The leaves get black spots, then the entire leaf gets covered, dries up and dies. Black Eyed Susans. Will they be alright this year? Black-eyed susan (Rudbeckia hirta) is such a popular wildflower it has been added to many cultivated flower gardens. Look for misshapen, curling, stunted, or yellowing leaves. Last summer the leaves of my black-eyed Susans developed spots and the whole plant eventually dried up. Start with healthy plants and do not purchase ones with spots on the leaves. The leaves began to drop and I finally took time from fighting with my clay filled garden and squash beetles (yup, its me) and inspected the damage. These abnormalities growing on the leaf and petiole surfaces is a physiological disorder, intumescence. Leaf spot disease on a black-eyed susan. Q. Poison ivy may come to mind, but many common garden plants can also be skin irritants for sensitive people. The disease begins on lower leaves Some, such as the green peach aphid, feed on a variety of plants, while others, such as the rosy apple aphid, focus on one or just a few plant hosts. White, cottony fungal growth forms at the soil line; Small, white to reddish brown balls or black, long (mouse dropping-sized) structures form on the white growth. I've had Black-eyed Susan's along the side of my house for years; and about three years ago. The disease shows up as irregular black spots on the leaves. Try to encourage air movement to reduce leaf wetness. I've noticed dimples or bumps all over leaves, even down stems, on my rudebeckia that's obviously sucking the life out of the leaf showing purple damage streaking through the veins. Be sure to check the undersides of leaves; aphids love to hide there. Loads of yellow leaves with black spots were abandoning my tree fast enough to simulate October in I noticed the leaves turning black. Most aphids especially like succulent new growth. This post compares the Black-eyed susan with another coneflower commonly called Tall coneflower, Green-headed coneflower, or Cutleaf coneflower (Rudbeckia laciniata).Have you ever looked closely at Black-eyed susans leaves? Some plants can cause itchy rashes when touched. Do not use sprinkler irrigation. Several leaf spots diseases can cause the symptoms you described. Stem rot: Lower leaves yellow, wilt, and die. Clusters of green to white or tan wart-like bumps or lesions were recently observed among veins and petioles of black - eyed Susan vine liners. They didn't get as tall and the flowers didn't get as big. Intumescence on Black-eyed 2019 Sponsors Susan vine. This can disfigure the plant significantly if the weather is favorable, wet, hot and humid. 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