抄録
The patterns of conidial discharges of an Entomophthora species ("grylli" type) were investigated on naturally-infected larval cadavers of Mamestra brassicae under continuous dark or light conditions at 20°C, and in the field. The great majority of the infected larvae in a field of carrots were killed in the afternoon and a few at night. The longest lag period in advance of conidial discharge occurred with cadavers collected at 2 a.m. The lag period decreased during the course of the day and was shortest on cadavers collected at 10 p.m. The fungus, by adjusting the length of the lag period, discharged most of the conidia during the night from the cadavers collected during the day. The conidial discharge was initiated rapidly at night on cadavers that had been collected in the evening and night. However, the initiation of the conidial discharge was delayed and continued for a long period on cadavers collected at 2 a.m. ; many conidia continued to be discharged the following night. The patterns of the conidial discharges in a day were similar under the above three different conditions.
