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Thai) 1:
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Isolates of non-toxigenic Aspergillus niger (KUFC 7124 and 7170) and A. tubingensis (KUFC 7112 and 7123) were selected to assess in vitro antagonist activity against ochratoxin A and fumonisin producing A. niger (KUFC 7180, 7204, 7206, 7215 and 7216) and five plant pathogenic fungi viz. Fusarium oxysporum, Phytophthora palmivora, Pythium aphanidermatum, Rhizoctonia solani and Sclerotium rolfsii. Two isolates each of non-toxigenic A. niger and A. tubingensis were cultivated in dual culture with five isolates of toxigenic A. niger and plant pathogenic fungi. Non-toxigenic A. niger (KUFC 7124) suppressed toxigenic A. niger (KUFC 7180, 7125 and 7126) at levels of 62.1, 52.7 and 51.1% respectively. Non-toxigenic A. niger (KUFC 7124) reduced the growth of Phytophthora palmivora and Fusarium oxysporum with 70.6% and 68.6%, respectively. Non-toxigenic A. niger (KUFC 7170) inhibited toxigenic A. niger (KUFC 7180, 7206, 7215 and 7216) approximately 50%, whilst inhibited mycelium growth Phy. palmivora and F. oxysporum 77.8% and 58.2%, respectively. However all non-toxigenic isolates failed to inhibit the mycelial growth of S. rolfsii. Non-toxigenic A. tubingensis (KUFC 7112) effectively inhibited mycelium growth of F. oxysporum by 62.3%, but only inhibited mycelium growth of Phy. palmivora, R. solani and P. aphanidermatum by approximately 40%.
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