Symptoms of aerial stem rot (ASR) caused by Pectobacterium carotovorum. (IMAGE)
Caption
Symptoms of aerial stem rot (ASR) caused by Pectobacterium carotovorum. A, Initial infections occur through wounds such as petiole scars or insect damage and expand outward, creating a distinct black lesion. B, The lesion spreads down the stem, infecting petioles and eventually killing the stem. C, Severe ASR infection showing disease in four out of five stems on the plant. Note that the lesions have spread down the stem as healthy, green tissue can be seen around the base of the plant in the infected stems.
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Courtesy Phillip S. Wharton—© 2025 The American Phytopathological Society
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