1 of 3. Some leaves may have 3 or more lobes. The name curly top comes from the symptoms the infection causes in the leaves of the plant: twisting, curling, and rolling. Problems With Rudbeckia. They didn't get as tall and the flowers didn't get as big. The branches also become distorted. WHITEFLIES. It has affected all of the leaves on one plant though the ⦠Powdery Mildew Erysiphe cichoracearum. They bend downward, while the leaves curl ⦠Black Eyed Susanâs. Powdery, fluffy white spots and blothces on leaves, stems, and flower parts; Tiny black round spheres may be visible within white spots late in the season; There are way few flowers now. I have several patches of Black Eyed Susan along a border on the north side of my house. 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. However, colonies of Black-eyed Susans can become quite large. Members of the aster family, Asteraceae, the âblack eyeâ is named for the dark, brown-purple centers of its daisy-like flower heads. 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 ⦠CAUSE: Whiteflies are small, moth-like insects that cluster on the undersides of leaves. The flowers look daisy-like at a distance. Both nymphs and adults suck the fluids from new growth, which causes fresh leaves to be stunted or twisted. I've had Black-eyed Susan's along the side of my house for years; and about three years ago. Black-Eyed Susan forgives neglect and has moderate drought tolerance. The symptoms of cowpea curly top virus usually begin with stunting and puckering on the leaves. SYMPTOMS: Stunted or twisted leaves, white spots or black moldy areas on the top of foliage. 4. Black-eyed Susans will average 2â3 feet in height and about 1â2 feet in clump width. I noticed the leaves turning black. The plants in question are black eyed susan (Rudbeckia hirta i think) and Echinacea purpurea. Proper spacing between plants will increase air circulation between the plants to keep leaves dry and help prevent the spread of diseases. They are planted in good soil that is well drained and they get full sun. Butterfly bush (Buddleia davidii), Black-eyed Susan (Rudbeckia), yarrow (Achillea), butterfly plant (Asclepias), and sunflowers will bring many others. Black Eyed Susan (Rudbekia) > Spots on leaves. 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 leaves get black spots, then the entire leaf gets covered, dries up and dies. Leaf spot is a common fungal disease on black-eyed susans this time of year, but it's too late to do much about it now. 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