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The disease begins on lower leaves … I've had Black-eyed Susan's along the side of my house for years; and about three years ago. Black-eyed susan (Rudbeckia hirta) is such a popular wildflower it has been added to many cultivated flower gardens. 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. 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. Do not use sprinkler irrigation. 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 susan’s leaves? Most aphids especially like succulent new growth. Q. 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. Sometimes it is just a certain part of the plant that irritates, like the sap of Euphorbia or the roots of hyacinth. Be sure to check the undersides of leaves; aphids love to hide there. The leaves began to drop and I finally took time from fighting with my clay filled garden and squash beetles (yup, it’s me) and inspected the damage. Rudbeckia is a perennial plant also known as black-eyed Susan, yellow oxeye daisy, English bulls-eye, Gloriosa daisy, and coneflower. Q: My black-eyed susans have black spots on the leaf that multiply until the leaf just dies. 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. Several leaf spots diseases can cause the symptoms you described. Black Eyed Susan’s. That said, Black-eyed Susan (Rudbeckia) tends to contract a disease called Septoria Leafspot. 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. 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. I noticed the leaves turning black. Look for misshapen, curling, stunted, or yellowing leaves. The leaves get black spots, then the entire leaf gets covered, dries up and dies. Spots on Leaves of Black Eyed Susan. Stem rot: Lower leaves yellow, wilt, and die. Last summer the leaves of my black-eyed Susans developed spots and the whole plant eventually dried up. They didn't get as tall and the flowers didn't get as big. There are way few flowers now. Try to encourage air movement to reduce leaf wetness. ... starting as 1/8-inch-diameter spots but quickly merging to cause large brown areas on otherwise dark green leaves. Poison ivy may come to mind, but many common garden plants can also be skin irritants for sensitive people. The disease shows up as irregular black spots on the leaves. Its leaves are green, alternately arranged, lance shaped, and covered with bristly hairs giving the leaf a grey/green colour. Although, for some extremely sensitive people, any part of a plant they are affected by can cause irritation. 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. These abnormalities growing on the leaf and petiole surfaces is a physiological disorder, intumescence. Once established, it is difficult to control. Some plants can cause itchy rashes when touched. 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