Cymadothea trifolii (Pers.) F.A. Wolf, (black blotch or sooty blotch disease of clovers - causative organism)


2 Aug 2007 at OSGR: SU46 in Berks, England

Record SummaryPolythrincium anamorph on underside of leaflets of White Clover
Found asInfection
Date2 August 2007
Associated organismTrifolium repens
OS grid refOSGR: SU46
Lat/Lon51° 20’ N, 1° 20’ W
Vice CountyBerks, VC no: 22
CountryEngland
Voucher2 Aug 2007[B]
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Notes:

Leaf lamina upper surface with small yellow spots with diffuse borders and grey centres. As they age the tissue dies to form a depressed grey spot.

Lamina lower surface with rough, spherical black colonies arranged in clusters on the leaf spots, eventually covering most of leaf. Infection evenly distributed over whole leaflet.

Petiole unaffected, but lamina eventually turning yellow and dying.

Conidia: grey, smooth, thin-walled, 1-septate, amygdaliform, 16.5-20.5/10-13µm.

Conidiophores: grey, sinuous, 5µm diam, arising from swollen 10µm diam base with septum below.

The following literature was used to identify this find:

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