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 … It has affected all of the leaves on one plant though the … The name curly top comes from the symptoms the infection causes in the leaves of the plant: twisting, curling, and rolling. Black-Eyed Susan forgives neglect and has moderate drought tolerance. WHITEFLIES. They are planted in good soil that is well drained and they get full sun. CAUSE: Whiteflies are small, moth-like insects that cluster on the undersides of leaves. Some leaves may have 3 or more lobes. The branches also become distorted. 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. 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; They bend downward, while the leaves curl … Powdery Mildew Erysiphe cichoracearum. I noticed the leaves turning black. The symptoms of cowpea curly top virus usually begin with stunting and puckering on the leaves. 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. There are way few flowers now. Butterfly bush (Buddleia davidii), Black-eyed Susan (Rudbeckia), yarrow (Achillea), butterfly plant (Asclepias), and sunflowers will bring many others. 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. I noticed that some of the plants have a disease that causes the leaves to turn dark brown at the edges and curl. The plants in question are black eyed susan (Rudbeckia hirta i think) and Echinacea purpurea. Members of the aster family, Asteraceae, the “black eye” is named for the dark, brown-purple centers of its daisy-like flower heads. Black-eyed Susans will average 2–3 feet in height and about 1–2 feet in clump width. Both nymphs and adults suck the fluids from new growth, which causes fresh leaves to be stunted or twisted. Black Eyed Susan’s. Proper spacing between plants will increase air circulation between the plants to keep leaves dry and help prevent the spread of diseases. Five overlapping, solid-colored petals surround a … Q. SYMPTOMS: Stunted or twisted leaves, white spots or black moldy areas on the top of foliage. I've had Black-eyed Susan's along the side of my house for years; and about three years ago. Black Eyed Susan (Rudbekia) > Spots on leaves. 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