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Abstract
Cladosporium herbarum was the only fungal species, out of the five isolated from the onion phylloplane and tested for antagonism against Alternaria porri that could also inhibit the pathogen on contact in vivo: Cladosporium herbarum could reduce the infection by 66.6%; Penicillium sp. (54%) and Aureobasidium pullulans (33.3%) were much less effective. Sporobolomyces roseus and Cryptococcus luteolus were able to reduce infection by only 20.8% and 12.5% respectively. However, a mixture of all five species caused a reduction of 79.1 % in infection by the pathogen. A significant observation was that the fungi, namely Penicillium sp., Aureobasidium pullulans, Sporobolomyces roseus and Cryptococcus luteolus which were effective to a greater or lesser degree in reducing the infection by A. porri, in vivo when studied for antagonism in vitro could not inhibit the pathogen.