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Heat-resistant Fungi in Soil Samples from Northern Nigeria.

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A total of 156 soil samples collected from parts of Northern Nigeria were examined for heat-resistant fungi (HRF) which could cause spoilage of heat processed fruits and fruit products. Each sample was subjected to 70°C for 1 h before plating on potato sucrose agar. Approximately 77% of all the samples contained HRF which were identified as Neosartorya fischeri , N. fischeri var. spinosus , N. quadricincta and Aspergillus fischeri . Other HRF which occurred infrequently were Aspergillus fumigatus and Penicillium spp. The fungal counts in the positive samples generally ranged from 18-300 propagules/10g of soil.

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