Dept of Agriculture Development 
SFAC KeralaInfection and decay commonly occur at one or both ends of the root, although infection occasionally begins elsewhere.
Rotting may be inhibited under dry conditions, but under humid conditions the affected tubers become soft and watery and the entire root rots within a few days.
If the humidity is high, the sweet potatoes become heavily whiskered with agrayish black fungal growth.
The feature distinguishes rhizopus soft rot from other storage rots.
The color of the root is not significantly altered but an odor is produced that attracts fruit flies to the affected area.
Carefully handle sweet potatoes during harvest and storage to prevent wounding.
Properly cure roots immediately after harvest.
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