I've had Black-eyed Susan's along the side of my house for years; and about three years ago. This can disfigure the plant significantly if the weather is favorable, wet, hot and humid. These abnormalities growing on the leaf and petiole surfaces is a physiological disorder, intumescence. Do not use sprinkler irrigation. The disease begins on lower leaves … 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. 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. I noticed the leaves turning black. Try to encourage air movement to reduce leaf wetness. The disease shows up as irregular black spots on the leaves. The leaves get black spots, then the entire leaf gets covered, dries up and 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. Intumescence on Black-eyed 2019 Sponsors Susan vine. Black Eyed Susan’s. There are way few flowers now. Q: My black-eyed susans have black spots on the leaf that multiply until the leaf just dies. Stem rot: Lower leaves yellow, wilt, and die. Be sure to check the undersides of leaves; aphids love to hide there. Some plants can cause itchy rashes when touched. Once established, it is difficult to control. 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. Sometimes it is just a certain part of the plant that irritates, like the sap of Euphorbia or the roots of hyacinth. Leaf spot disease on a black-eyed susan. They didn't get as tall and the flowers didn't get as big. Rudbeckia is a perennial plant also known as black-eyed Susan, yellow oxeye daisy, English bulls-eye, Gloriosa daisy, and coneflower. 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. The entire plant may die. ... starting as 1/8-inch-diameter spots but quickly merging to cause large brown areas on otherwise dark green leaves. Last summer the leaves of my black-eyed Susans developed spots and the whole plant eventually dried up. Poison ivy may come to mind, but many common garden plants can also be skin irritants for sensitive people. Several leaf spots diseases can cause the symptoms you described. 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? Will they be alright this year? Loads of yellow leaves with black spots were abandoning my tree fast enough to simulate October in … Spots on Leaves of Black Eyed Susan. Its leaves are green, alternately arranged, lance shaped, and covered with bristly hairs giving the leaf a grey/green colour. 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. Look for misshapen, curling, stunted, or yellowing leaves. 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. That said, Black-eyed Susan (Rudbeckia) tends to contract a disease called Septoria Leafspot. Start with healthy plants and do not purchase ones with spots on the 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. 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