Abstract
In the present paper, the writer reported the result of investigations on the influence of light upon the conidial germination of Cochliobolus miyabeanus.
The lethal effect of a sun lamp was far inferior to that of a germicidal lamp, because the former scarcely includes the effective wave length for sterilization, 2537Å.
A sudden increase of the sensitivity of conidia to ultraviolet light was observed, when the conidia were suspended in water. The reason is not yet clear.
In the present experiment, the writer estimated the germicidal effect of ultraviolet light by determining the percentage of conidial germination. In view of occurrence of delayed germination, the germination percentage was determined at least 24 hours after the irradiation.
Difference in the sensitivity of conidia to ultraviolet light was found among the isolates of C. miyabeanus, the isolate No. 58 being more sensitive than the isolate No. 13.
