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