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Necrotic bleached area on onion foliage, a symptom of bacterial bulb rot.

Three long green onion leaves lay on a black table alongside a ruler. About two inches of one leaf is yellow, with the edges of the bleached area appearing dry. Credit: Brenna J. Aegerter, UCCE San Joaquin County — Credit: Brenna J. Aegerter, UCCE San Joaquin County

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