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