Black-Eyed Susan forgives neglect and has moderate drought tolerance. The nymphs are translucent and can appear to be the same color as the leaves. Five overlapping, solid-colored petals surround a ⦠There are way few flowers now. I noticed the leaves turning black. They are planted in good soil that is well drained and they get full sun. The branches also become distorted. Black Eyed Susan (Rudbekia) > Spots on leaves. I've had Black-eyed Susan's along the side of my house for years; and about three years ago. Plants in the Rudbeckia genus, most often referred to as coneflowers and black-eyed Susans, have warm yellow to red, multiple-petaled flowers surrounding a ⦠The leaves get black spots, then the entire leaf gets covered, dries up and dies. Proper spacing between plants will increase air circulation between the plants to keep leaves dry and help prevent the spread of diseases. Black-eyed Susans are moderate feeders. Q. They bend downward, while the leaves curl ⦠The symptoms of cowpea curly top virus usually begin with stunting and puckering on the leaves. Butterfly bush (Buddleia davidii), Black-eyed Susan (Rudbeckia), yarrow (Achillea), butterfly plant (Asclepias), and sunflowers will bring many others. Members of the aster family, Asteraceae, the âblack eyeâ is named for the dark, brown-purple centers of its daisy-like flower heads. Black Eyed Susanâs. However, colonies of Black-eyed Susans can become quite large. The plants can grow to over 3 feet tall, with leaves of 6 inches, stalks over 8 inches long, and flowers with a diameter of 2 to 3 inches. Powdery Mildew Erysiphe cichoracearum. All ⦠I noticed that some of the plants have a disease that causes the leaves to turn dark brown at the edges and curl. The flowers look daisy-like at a distance. Problems With Rudbeckia. The problem i'm having is that during the day they tend to wilt and the leaves curl, almost as if they don't have enough water, the cone flowers are particularly bad. The black-eyed Susan vine (Thunbergia alata) is a frequent sight in hanging baskets at the garden center.This flowering vine is as easy to care for as it is charming. SYMPTOMS: Stunted or twisted leaves, white spots or black moldy areas on the top of foliage. Black-eyed Susans will average 2â3 feet in height and about 1â2 feet in clump width. WHITEFLIES. I have several patches of Black Eyed Susan along a border on the north side of my house. CAUSE: Whiteflies are small, moth-like insects that cluster on the undersides of leaves. The plants in question are black eyed susan (Rudbeckia hirta i think) and Echinacea purpurea. The name curly top comes from the symptoms the infection causes in the leaves of the plant: twisting, curling, and rolling. Some leaves may have 3 or more lobes. 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