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POWDERY MILDEW White to gray powdery cast on leaves, stems and/or buds and flowers. Photo by Plant Disease Clinic |
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BOTRYTIS Water-soaked lesions may appear on leaves or flowers. As disease progresses, any upper plant part may become blighted and coverd with a grey, fuzzy mold. Photo by Janna Beckerman |
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FUNGAL LEAF SPOT Brown spots appear on foliage. Spots could be in a target pattern (concentric rings), be bordered by red rings, or have small black dots within the dead tissue. Photo by Plant Disease Clinic |
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BACTERIAL LEAF SPOT Brown spots appear on foliage. Spots could be small or large and are frequently water-soaked (translucent) with a yellow halo. Leaf margins may turn brown. Photo by Plant Disease Clinic |
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FLUORIDE TOXICITY Margins and tips of leaves turn yellow and/or brown. In some plants, elliptical, brown lesions form between the leaf veins. Photo by Janna Beckerman |
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SOOTY MOLD A black film develops on leaves or stems, and can easily be wiped off with a moist towel. Photo by Plant Disease Clinic |
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VIRUSES Viruses may cause many different types of symptoms on plants, such as theses brown ring spots. Other symptoms may include dwarfed plants, and cupped, crinkled, or mottled leaves Photo by Plant Disease Clinic |
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OEDEMA Pale green or water-soaked blisters or bumps erupt and turn brown or black, and may have a corky appearance. Photo by Plant Disease Clinic |
