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Onion white rot

Posted Jul 26 2009 10:04pm

Onion white rot (Latin name – Sclerotium cepivorum) affects onions, spring onions, leeks, & chives.

Symptoms of onion white rot:

    * plants die
    * onion leaves wilt & collapse
    * bulbs rot at the base and are covered with a fluffy white mould.

Onion-white-rot

Onion-white-rot

Cause of onion white rot

    * a fungus
    * spreads from plant to plant by contact between roots and bulbs
    * can live in the soil for up to 15 years
    * very difficult to eradicate from the soil

Prevention of Onion white rot

    * rotate onion family so only grow every three or four years
    * do not grow onion family in soil contaminated with onion white rot

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