I bought a Rudbeckia a decade ago, and its self-seeded progeny now dot my property nicely. Powdery mildew on coneflowers appears during periods of high humidity as splotchy areas with the growth of a white substance resembling powder, as the name suggests. One of my three black-eyed susans (Rudbeckia fulgida "Little Suzy") is turning brown and dying. This white fungus often changes to gray or tan and can cause rudbeckia plant leaves to curl, stunt and drop from the plant prematurely. With flowers that reach over three inches in size on this two-foot-tall plant, its flowers dominate the landscape throughout the summer. Some … Septoria lepachydis: Water in a manner that keeps moisture off the leaves and stems. Deadheading old flowers encourages the plants to produce more blossoms. There isn't a specific disease that produces leaf curl in Rudbeckia. The leaves on my blackeyed susans constantly wilt. The petals remain green and the flowers small. Entyloma compositarum: Several plants in the aster family are susceptible and should be examined for symptoms. One thing I'm seeing on many of the trees is that the leaves are curling … As a bonus, the foliage has a sweet vanilla-like scent, making it a great addition to bouquets. Flowers may not produce seeds. Another plant that also attracts butterflies, Rudbeckia ‘Goldsturm’ bloom from mid-summer to early fall, providing over three months of bright yellow blooms during their blooming period. It has caused the holes in the leaves, the brown spots on the leaves and the distortion. This looks like a fungal problem on your Rudbeckia. Downy mildew sporulation develops on the underside of leaves and is usually gray, brown or purple and has a downy texture. Black spots on Rudbeckia don't interfere with blooming. Have you noticed the leaves on your oak tree curling? Lower leaves die and become covered with white to gray, fluffy fungal growth that soon becomes a mass of gray spores. Chlorosis, yellowing of the leaves while the veins remain green, is a major symptom of aster yellows. Leaves: Shiny, oblong to lanceolate, hairy, dark green foliage: basal leaves 3-6 inches long and half as wide, with prominent veins, dentate margins, and rounded or cordate leaf bases; stem leaves smaller, almost bract-like, progressively smaller up the stems, with bases narrowing to a winged petiole. Leaves wilting and curling as a result of tomato spotted wilt virus Miyuiki Satake /Getty Images How to Identify Tomato Spotted Wilt Virus . Black-eyed Susans also start blooming in June, but continue to produce flowers through October. Purplish-brown spots develop on the leaves, often completely covering older leaves. Downward curling of leaves on young seedlings and young leaves … Echinacea blooms about mid-summer and lasts about a month, after which there is a temporary dormancy. The leaves are rough to the touch. 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