Proper spacing between plants will increase air circulation between the plants to keep leaves dry and help prevent the spread of diseases. There are way few flowers now. The symptoms of cowpea curly top virus usually begin with stunting and puckering on the leaves. The branches also become distorted. Black-eyed Susans are moderate feeders. SYMPTOMS: Stunted or twisted leaves, white spots or black moldy areas on the top of foliage. It has affected all of the leaves on one plant though the ⦠Butterfly bush (Buddleia davidii), Black-eyed Susan (Rudbeckia), yarrow (Achillea), butterfly plant (Asclepias), and sunflowers will bring many others. Q. They are planted in good soil that is well drained and they get full sun. 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. Powdery Mildew Erysiphe cichoracearum. I noticed that some of the plants have a disease that causes the leaves to turn dark brown at the edges and curl. They didn't get as tall and the flowers didn't get as big. The leaves get black spots, then the entire leaf gets covered, dries up and dies. 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. Some leaves may have 3 or more lobes. 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 nymphs are translucent and can appear to be the same color as 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. 1 of 3. The name curly top comes from the symptoms the infection causes in the leaves of the plant: twisting, curling, and rolling. 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 forgives neglect and has moderate drought tolerance. 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. WHITEFLIES. Problems With Rudbeckia. The flowers look daisy-like at a distance. 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; Both nymphs and adults suck the fluids from new growth, which causes fresh leaves to be stunted or twisted. 4. 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. 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