Abstract
SUMMARY: In a survey of moulds attacking painted surfaces, Phoma violacea was found commonly associated with paintwork in glasshouses (twenty‐eight isolates) and was once observed on exterior paintwork. No source of infection was traced, except for the attack on exterior paintwork which probably originated from a nearby glasshouse. Distribution by insects was noted. P. violacea was shown capable of attacking paint films from either surface (above or below) and penetration of the film from the top surface was demonstrated in laboratory and natural exposure tests. P. violacea was used in standard methods of testing fungicidal paints in comparison with other genera commonly employed. The development of strains resistant to fungicides was noted.

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