BioImages: The Virtual Field-Guide (UK)

Phytophthora infestans (Mont.) de Bary, 1876 (Potato Blight, Potato Late Blight & Tomato Blight (Causative Agent))

Date: 20 August 2009
OS grid ref: SU56
Lat/Lon: 51° 20' N, 1° 10' W
Location: Vice County: Berks, VC22, England
Voucher: 20/08/2009[A]
(Please quote this in any queries about this record)
Record Summary: infection on Tomato plant
Associated organism: on live fruit, leaf, stem of Lycopersicon esculentum
Identification Notes: Dark wrinkly patches on upper face of fruit, brown lesions on leaves, blackish-brown lesions on stems.

White mycelium developed a few days after collection.

Sporangia hyaline, pyriform, with apical papilla and residual basal stalk, 33-60/18-24µm; only weakly staining in Cotton Blue, and then mostly the immature sporangia.

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