Neofusicoccum parvum

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Neofusicoccum parvum - A) ascoma; B-E) asci; F) ascospores; G, H) conidiogenous cells; I) hyaline, aseptate conidia; J) coloured, 1- and 2-septate conidia. Scale bars: A = 50 μm, B, C, F, G = 10 μm, D, E, H–J = 5 μm
Author(s): A.J.L. Phillips, A. Alves, J. Abdollahzadeh, B. Slippers, M.J. Wingfield, J.Z. Groenewald and P.W. Crous
Source: Studies in Mycology, 2013, 76, p.144

Neofusicoccum parvum (Pennycook & Samuels 1985) Crous, Slippers & A.J.L. Phillips 2006

The fungus is widespread and causes trunk canker (with brown and red exudates), shoot blight, dieback and decline on grapevine, fruit trees and various other trees. In cross-sections the cankers are brown and wedge-shaped. On grapevine, light brown streaks develop under the bark which extend laterally and have yellow-orange areas at the edges of the streaks. The fungus is primarily transmitted through grafting wounds in grapevines. Bud necrosis, shoot dieback, graft failure and plant death may also result from the infection.

Pycnidia are black and spherical. They produce unicellular and ellipsoid conidia with round apices, truncated bases and a smooth surface which are around 10-20 x 3-6 µm large. Ascospores are also ellipsoid, approximately 20-25 x 10 µm large.

Synonyms:
Botryosphaeria parva (teleomorph synonym)
Fusicoccum parvum