Abstract
One of the most common fungi with which the market pathologist must deal is the ubiquitous Fusarium. There are very few vegetables on which Fusarium does not occur, either as a primary or secondary incitant of decay, and so the problem of identification of Fusarium species is an ever present one. During the course of recent work with species of Fusarium isolated from decayed onion bulbs, one of the chief difficulties has been the production in artificial culture of sufficient normal macrospores for taxonomic studies. Various methods of inducing sporulation have been tried, but in many cases these were unsuccessful or only. inconsistently fruitful. Often microspores were produced in abundance but the macrospores, which are usually necessary for identification, were lacking. The consistent success of RAMSEY and BAILEY (14) in producing macrospores of the onion parasite Fusarium cepae Hanz. emend. LINK and BAILEY (8) upon irradiation with ultraviolet suggested the use of this method for unidentified strains of Fusarium from onion. In not all instances was the irradiation as beneficial as in the case of F. cepae, but in a large percentage of strains it was helpful and in some it induced marked increase in spore production.
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