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Species Page

calico disease of potato

Potato black ringspot virus
This information is part of a full datasheet available in the Crop Protection Compendium (CPC);www.cabi.org/cpc. For information on how to access the CPC, click here.
©CAB International. Published under a CC-BY-NC-SA 4.0 licence.

Distribution

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Host plants / species affected

Main hosts

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Solanum tuberosum (potato)

List of symptoms / signs

Leaves - abnormal colours
Leaves - abnormal patterns

Symptoms

Potato plants primarily infected with the type strain develop local and systemic necrotic spots and ringspots and sometimes systemic necrosis (Fribourg, 1983). The Andean calico strain induces calico-like symptoms in certain potato cultivars under Andean highland conditions. Bright yellow areas on the margins of middle and upper leaves gradually increase in size to form large patches. Most of the plant foliage may eventually turn yellow without stunting or leaf deformations. Arracacha shows mosaic and leaf deformation symptoms.

Prevention and control

As with all potato viruses, control depends on the production of high-quality seed potatoes from virus-free nuclear stock (OEPP/EPPO, 1999a).

Impact

PBRSV causes damaging symptoms in some potato cultivars under certain conditions. Fribourg (1977) describes it as widespread in Peru. However, it has not been recorded as causing any particular losses in potato production. It does not appear to be a very important virus in the area where it occurs, any more than Tomato black ring virus is on potato in Europe.