Abstract
Abstract Fluorescent Pseudomonas spp. from 62 root, leaf, and fruit samples covering 24 horticultural crops, and 8 pastoral soil samples, were tested in vitro for their ability to inhibit the growth of five pathogenic fungi—Botrytis cinerea Persoon, Fusarium oxysporum Schlechtendal f. sp. lycopersici (Saccardo) Snyder & Hansen, Phytophthora nicotianae van Breda de Haan var nicotianae, Pythium debaryanum auct. (non Hesse), and Pythium ultimum Trow. Bacterial isolates from 17, 15, 10, and 5 crops showed some degree of antagonism towards Pythium spp., B. cinerea, P. nicotianae, and F. oxysporum respectively. The isolates from the rhizosphere of beetroot, lettuce, loquat, pasture, strawberry, and the fructoplane of lemon had the greatest percentage of antifungal bacteria. There were differences between plant species in the percentage of antifungal Pseudomonas spp. isolates showing antifungal activity against Pythium ultimum (P < 0.001), P. debaryanum (P<0.01), P. nicotianae (P<0.01), and B. cinerea (P<0.05). ...
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