Basal Rot disease of Onion
Basal rot is caused by fungus called Fusarium oxysporum
In basal rot, the affected plant shows drying of leaf tip downwards and entire plant shows complete drying of the foliage.
The bulb of the affected plant shows soft rotting and the roots get rotted.
There will be a whitish mouldy growth on the scale.
This disease can begin in the field and continue on in storage.
The fungus of Basal rot produces spores named chlamydospores
The fungus of basal rot rests and persists in the soil through the thick walled spores called Chlamydospores
Fusarium oxysporum fungus is soil borne
The primary site of infection of basal rot is through the root either directly or through wounds.
Control measure for basal rot of onion is Soil drenching with Copper oxychloride 0.25 %.