Basal Rot on onion leaves
Pathogen: Fusarium oxysporum
Symptoms
Yellowing of leaves and stunted growth are its first symptoms. Later on drying of leaves from tip to downwards is noticed.
Disease Development
Pathogen survives in soil and onion bulb as a primary source of inoculum in the form of Chlamydospore, resting spore for many years. In early stage of infection, roots of plants become pink in colour and rotting takes place later. In advanced stage, bulbs starts decaying from lower ends and ultimately whole plants die.
Disease Management
Drenching with carbendazim @ 0.1% is good for checking the growth of fungus. Five-year rotation with other crop is also recommended as its pathogen survives in soil. Dipping of seedling in 0.1% carbendazim also reduces basal rot in bulb crop significantly.
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