Thursday, June 13, 2024

Alfalfa Sprout Rot

Alfalfa Sprout Rot


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 above. Little disease occurs below 21°C.


Radicles are a translucent yellow as they emerge from the seed. In 24 to 48 hours, seeds stop growing and turn into a yellowish, odiferous mass that contains numerous bacteria. Disease initially occurs in a few trays, but it may spread throughout all trays in a few days.


1. Control temperature in the sprouting house.

2. Practice sanitation. Bacteria likely survive in water remaining in tanks used for soaking seeds.

3. Soak seeds for 2 hours in 0.5% sodium hypochlorite or calcium hypochlorite. However, hypochlorite is not currently registered for alfalfa seed treatment in the United States.

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