A physiological study of two strains of Fusarium in their casual relation to tuber rot and wilt of potato .. . ing time and inwell kept storage places is probably the determining factor in thisphenomenon. The experiments with tubers showed that F. tri-chothecioides made a great increase in growth rate when transferredfrom a low to a higher temperature. These temperature relations may also explain in part the factthat we usually find F. oxysporum producing wilt under field con-ditions, and lend support to the observations made by Orton (27),who reports potato wilt induced by Fusarium spp. to be
A physiological study of two strains of Fusarium in their casual relation to tuber rot and wilt of potato .. . ing time and inwell kept storage places is probably the determining factor in thisphenomenon. The experiments with tubers showed that F. tri-chothecioides made a great increase in growth rate when transferredfrom a low to a higher temperature. These temperature relations may also explain in part the factthat we usually find F. oxysporum producing wilt under field con-ditions, and lend support to the observations made by Orton (27),who reports potato wilt induced by Fusarium spp. to be pre-eminently a warm climate disease. F. trichothecioides can producewilt, but the temperature conditions in the soil are such as to favorF. oxysporum, the maximum temperature of the former beingthe optimum of the latter. Humphrey (15), working in Washing-ton on the tomato wilt induced by F. oxysporum, came to the con-clusion that temperature differences in various parts of the statewere determining factors for the appearance and non-appearanceand severity of the disease. 196 BOTANICAL GAZETTE ISEPTEMBER. ^ c
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