Abstract
When potato stocks infected with the gangrene fungus (Phoma exigua var.foveata) are graded after a period of storage, apparently healthy tubers can subsequently develop gangrene. Fumigation with 2-aminobutane (at a dose of 200 mg/kg) of such tubers, taken from 7 stocks which had been in storage several months (but were not showing visible sprouts), gave variable but significant reductions in the amount of gangrene that subsequently developed, provided treatment was done soon after grading. Fumigation of tubers showing visible gangrene lesions did not stop the lesions from spreading. Analyses of tubers for 2-aminobutane showed that residues in the peel and flesh were much lower than in tubers treated soon after harvest. It is suggested that the poorer gangrene control given by fumigation after storage resulted from lower absorption and poorer skin penetration by the 2-aminobutane.
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