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Bacterial Soft Rot


Bacterial Soft Rot

Usually appear in

Usually Spring and Autumn

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Caused By:-     Various Bacteria


The bacteria Streptomyces ipomoeae on sweet potatoes.
Bacterial Soft Rot is also called Soft Rot Tubers, root and fruit are usually affected although on some plants stems are also attacked. The affected areas can show signs of sinking inwards and stems typically have inky black symptoms on the outside. Some infections can spread rapidly and can kill or seriously weaken the attacked plant.
One of the most common bacteria is Erwinia carotovora subsp. carotovora which usually enters the plant via a wound or by various insects and also by using pruning utensils that are infected.
In storage good ventilation helps to keep tubers cool and prevent the accumulation of CO2, which makes the oxygen levels fall, and eliminate moisture films all of which aids the germination of the bacteria spores.
There may well be other fungi and yeasts that are secondary invaders after the initial infection by the bacteria.
Picture by Clemson University - USDA Cooperative Extension Slide Series,


Prune out affected areas as early as possible. Sterilize equipment before use. Spraying with a disinfectant like Jayes fluid or use a copper fungicide may help.

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