Researches on gas sterilizing effect upon microbes in stored grain. (4)

The fungicidal activity of methyl bromide for Penicillium islandicum (fungus of yellowsis rice grains)

Abstract

Fungicidal properties of methyl bromide was studied with spores of Penicillium islandicum, the fungus of yellowsis rice grains.
Spore mortality was assessed under microscope in most case, but colony counting on Koji extract agar in petri dish was also applied in case of high mortality.
The fungicidal effect increased with temperature. Spore mortality attained 100 per cent within 72hrs., at temperatures from 15° to 30°C.
Probit of mortality plotted against logarithm of fumigation time yielded straight lines, the slopes of which being almost constant at a given air humidity, irrespective of temperature and gas concentration.
The fungicidal effect did not appreciably change with air humidity.