Abstract
The half-life of conidia of Nomuraea rileyi treated in vitro with human gastric juice (pH 1.2) was ca. 23 min as measured by mortality of larvae of Trichoplusia ni (Hubner). Ca. 20 and 90% of the infectivity was lost after 20 and 30 min, respectively. The half-life in infectivity of conidia exposed to HCI (pH 1.2) was ca. 30 min. No loss of infectivity was detected in conidia exposed to either neutralized human gastric juice or phosphate buffer. Conidia exposed to human gastric juice for more than 30 min would not grow when cultured on Sabouraud maltose agar plus yeast.
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