Boeremia exigua

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Boeremia exigua var. pseudolilacis - A–C) fourteen-day-old colonies on OA (A), MEA (B) and CHA (C), D) pycnidia, E) section of young pycnidium, F) conidia, scale bars: D = 100 µm, E = 20 µm, F = 5 µm (click on image to enlarge it)
Author(s): M.M. Aveskamp, J. de Gruyter, J.H.C. Woudenberg, G.J.M. Verkley and P.W. Crous
Source: Studies in Mycology, 2010, 65, p. 39
Phoma exigua var. exigua infection on common bean (Phaseolus vulgaris) in a field in Colombia (click on image to enlarge it)
Author(s): Howard F. Schwartz, Colorado State University
Source: IPM Images

Boeremia exigua (Desm.) Aveskamp, Gruyter & Verkley, 2010

This fungus is widely distributed in temperate and subtropical regions, infecting leaves, stems, roots and tubers of a large variety of crops and other plants. The diseases caused include necroses, blights and rots. The asexual pycnidia are dark and sphaerical with a nonpapillated ostiole. The conidia are elongated, hyaline and unicellular, with a size of about 5-7 x 3 µm.

Various subspecies have been described, based on morphological, molecular and cultural characteristics as well as host plants. These include (see Aveskamp et al. 2010):
Boeremia exigua var. coffeae (Henn.) Aveskamp, Gruyter & Verkley 2010 - on coffee
Boeremia exigua var. diversispora - see Boeremia diversispora
Boeremia exigua var. exigua (Sacc.) Aveskamp, Gruyter & Verkley 2010 - on potatoes, apples, beans and other crops
Boeremia exigua var. forsythiae (Sacc.) Aveskamp, Gruyter & Verkley 2010 - on potatoes and other crops
Boeremia exigua var. foveata - see Boeremia foveata
Boeremia exigua var. gilvescens Aveskamp, Gruyter & Verkley 2010 - on potatoes and other plants
Boeremia exigua var. heteromorpha (Schulzer & Sacc.) Aveskamp, Gruyter & Verkley 2010 - on Nerium
Boeremia exigua var. lilacis (Sacc.) Aveskamp, Gruyter & Verkley 2010 - on Syringa
Boeremia exigua var. linicola (Naumov & Vassiljevsky) Aveskamp, Gruyter & Verkley 2010 - on Linum
Boeremia exigua var. populi (Gruyter & P. Scheer) Aveskamp, Gruyter & Verkley 2010 - on poplar
Boeremia exigua var. pseudolilacis Aveskamp, Gruyter & Verkley 2010 - on Syringa
Boeremia exigua var. viburni (Roum. ex. Sacc.) Aveskamp, Gruyter & Verkley 2010 - on Viburnum

Synonyms:
Ascochyta hordei
Phoma exigua
Phyllosticta sojicola
Phyllosticta sojaecola