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Antique Illustration, Copyright has expired on this artwork. From my own archives, digitally restored. Stem rust, cereal rust, black rust, red rust or red dust, is caused by the fungus Puccinia graminis. Covered smut of barley is caused by the fungus (Ustilago hordei, Ustilago carbo). Urocystis occulata, smut fungus which attacks the leaves and stalks of rye. Claviceps purpurea is an ergot fungus that grows on the ears of rye and related cereal and forage plants. Grapevine powdery mildew disease (Oidium tuckeri Berk.). Late blight or potato blight, oomycete or water mold, a fungus-like microorganism that causes the serious potato and tomato disease (Phytophthora infestans). Rhytisma acerinum, plant pathogen that commonly affects sycamores and maples in late summer and autumn, causing tar spot. Fungal plant pathogen of blackthorn (Prunus spinosa) that causes the pocket or bladder plum gall (Taphrina pruni ,Exoascus pruni).