ALLIACEAE (onion family)
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Symptoms and diagnostic features Young leaves show water-soaked then yellow longitudinal lesions or stripes that later split and rot. The leaves can become curled and twisted as growth continues (1, 2). On older leaves, the pathogen causes yellow spots around wounds. Flowering stalks are very susceptible and develop deep, water-soaked lesions that ooze a bacterial exudate. Older stalk lesions are sunken, first yellow, then finally brown in color. Leek transplants can develop the disease while growing in greenhouses. Leaves of transplants develop yellow, then brown, elongated lesions (3). Lesions usually involve the tips of the leaves .