Cronartium ribicola J.C. Fisch., (white pine blister rust)


8 Oct 2009 at OSGR: SU57 in Berks, England

Record SummaryHypophyllous telia on fading Black Currant leaves
Found asTelia (III)
Date8 October 2009
Associated organismRibes nigrum
OS grid refOSGR: SU57
Lat/Lon51° 30’ N, 1° 10’ W
Vice CountyBerks, VC no: 22
CountryEngland
Voucher8 Oct 2009[D]
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Notes:

Causes small polygonal brown necrotic spots with slightly darker borders and limited by veinlets; neighbouring area often yellowish. The spots coalesce and eventually cover much of the leaf.

Underneath the spots bear crowded uredia which commence bright, pale orange but soon darken to match the leaf spot. The uredia develop into pale orange columnar telia which soon fade to dirty white. They cover the underside of the leaf so it looks like Terry Cotton. The telia eventually attract dematiaceous hyphomycetes.

The following literature was used to identify this find:

standard photographs and close-ups
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macro-photographs
macro-photographs:
photomicrographs
photomicrographs:

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