Mycosphaerella brassicicola (Duby) Lindau, (Brassica ring spot - causative organism)


7 Apr 2007 at OSGR: SU10 in South Hants, England

Record SummaryLeaf spots on fading and attached dead leaves of Broccoli
Found asAnamorph
Date7 April 2007
Associated organismBrassica oleracea var italica
OS grid refOSGR: SU10
Lat/Lon50° 50’ N, 1° 50’ W
Vice CountySouth Hants, VC no: 11
CountryEngland
Voucher7 Apr 2007[A]
(Please quote this in any queries about this record)

Notes:

Fading leaves with large grey zonate leaf spots up to 20mm diam surrounded by a yellow zone with the central 10mm populated with abundant mainly epiphyllous black pycnidia, often leaving a white spot in the centre of the leaf spot.

Attached dead leaves with similar spots which are more obviously zonate.

Pycnidia: grey under microscope, 0.2-0.3mm diam. immersed, but bulging, with a small black ostiole. Conidia: hyaline, 3-5/1.3µm.

Pseudothecia: similar, containing unripe septate ascospores.

The following literature was used to identify this find:

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

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