Onion rust

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A.M. Varela, icipe
Is this a Minor Pest?
Minor Pest Title

Onion rust (Puccinia porri)

Minor Pest Description

Affected leaves show small reddish to dusty orange spots (pustules). These later turn black and are covered until maturity by leaf epidermis. Leaves that are heavily infected turn yellow and die prematurely. A new crop of leaves may develop and the bulb size is usually reduced. The fungus attacks also leek, shallot and some wild species of Allium. The disease is favoured by high humidity coupled with moderate to low temperatures. Also excessive nitrogen in the soil favours disease development.


Minor Pest What to do.
  • Disease management involves rotation, and removal of weed hosts.
Minor Pest Position
Minor Pest Firstcontent
Pest Type
Host Plants