Bacterial Leaf Spot Cause. Xanthomonas campestris pv. alfalfae (syn. X. alfalfae and Phytomonas alfalfae) survives in infected residue that has been incorporated into soil or is lying on the soil surface, in hay, and in debris associated with seed. During warm, wet weather, bacteria are splashed or blown onto leaves and […]

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Alfalfa Sprout Rot Cause. Erwinia chrysanthemi survives for up to 2 weeks on inoculated dried seeds. Air, the water supply, or greenhouse workers may introduce bacteria into a sprouting house. Spread within a tray is by seed to seed contact. Rot is most severe at high moisture and temperatures of 28°C and […]