I noticed that some of the plants have a disease that causes the leaves to turn dark brown at the edges and curl. I noticed the leaves turning black. 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; 1 of 3. SYMPTOMS: Stunted or twisted leaves, white spots or black moldy areas on the top of foliage. 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. The nymphs are translucent and can appear to be the same color as the leaves. CAUSE: Whiteflies are small, moth-like insects that cluster on the undersides of leaves. Members of the aster family, Asteraceae, the âblack eyeâ is named for the dark, brown-purple centers of its daisy-like flower heads. The branches also become distorted. I have several patches of Black Eyed Susan along a border on the north side of my house. Flowers are composed of a brown, domed center surrounded by bright yellow ray florets (sometimes orange) which first mature in mid-summer and, with deadheading, continue into mid-fall. 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. Black Eyed Susan (Rudbekia) > Spots on leaves. The flowers look daisy-like at a distance. All ⦠Some leaves may have 3 or more lobes. WHITEFLIES. Butterfly bush (Buddleia davidii), Black-eyed Susan (Rudbeckia), yarrow (Achillea), butterfly plant (Asclepias), and sunflowers will bring many others. Black-Eyed Susan forgives neglect and has moderate drought tolerance. 4. They are planted in good soil that is well drained and they get full sun. They didn't get as tall and the flowers didn't get as big. 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. The symptoms of cowpea curly top virus usually begin with stunting and puckering on the leaves. The leaves get black spots, then the entire leaf gets covered, dries up and dies. There are way few flowers now. 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 ⦠Black Eyed Susanâs. Both nymphs and adults suck the fluids from new growth, which causes fresh leaves to be stunted or twisted. They bend downward, while the leaves curl ⦠The plants in question are black eyed susan (Rudbeckia hirta i think) and Echinacea purpurea. 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. 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