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Species Page

white rust of chrysanthemum

Puccinia horiana
This information is part of a full datasheet available in the Crop Protection Compendium (CPC). Find out more information on how to access the CPC.
©CAB International. Published under a CC-BY-NC-SA 4.0 licence.

Distribution

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Extent
Invasive
Origin
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Host plants / species affected

Main hosts

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Chrysanthemum (daisy)
Chrysanthemum morifolium (chrysanthemum (florists'))

List of symptoms / signs

Inflorescence - lesions; flecking; streaks (not Poaceae)
Leaves - fungal growth
Leaves - necrotic areas
Leaves - wilting
Stems - mould growth on lesion

Symptoms

On Leaves

Following infection, pale-green to yellow spots, up to 5 mm diameter, develop on the upper surface. The centres of these spots become brown and necrotic with ageing. On the corresponding lower surface, raised, buff or pinkish, waxy pustules (telia) are found. As the spots on the upper surface become sunken, so these pustules become quite prominent and turn whitish when basidiospores are produced. Telia are occasionally found on the upper leaf surface. Severely attacked leaves wilt, hang down the stem and gradually dry up completely.

On Bracts and Stems

Sori sometimes develop when crops are excessively affected.

On Flowers

Infection has been recorded as necrotic flecking with occasional pustules (Dickens, 1970).

Prevention and control

Chemical Control

Due to the variable regulations around (de-)registration of pesticides, we are for the moment not including any specific chemical control recommendations. For further information, we recommend you visit the following resources:

Impact

P. horiana is now a feared and serious disease in nurseries, frequently causing complete loss of glasshouse chrysanthemum crops.