Identifier: physiologicalstu00link (find matches)
Title: A physiological study of two strains of Fusarium in their casual relation to tuber rot and wilt of potato ..
Year: 1916 (1910s)
Authors: Link, George Konrad Karl. (from old catalog)
Subjects: Fusarium. (from old catalog) Potatoes
Publisher: Chicago, Ill., The University of Chicago press
Contributing Library: The Library of Congress
Digitizing Sponsor: Sloan Foundation

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wilts of the potato plant induced by Fusarium spp. havegenerally been considered vascular mycoses due to a clogging of thevascular elements. In fact, however, the symptoms are due tokilling of the root system as much as to clogging of the vascularelements. It is true that members of the Elegans section, suchas F. oxysporum, frequent the vascular elements, spreading in theserather than clogging them, but it is true also that they destroy rootsin numbers. Again, even though some have referred to this diseaseas a root disease (Smith and Swingle 35), it is stated that thefungus enters a root, then spreads to the stelar part, and from thereenters other roots and stolons. Just as much damage is done by thepersistent attack from without upon roots and stolons, as notedby Manns (24). In the course of these experiments several questions wereraised. The soil in these experiments surely was more severelyinfected with the organisms than soil under field conditions can I9i6) LINK—FUSARIUM 189 m^
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100 BOTANICAL GAZETTE (September be, yet there were many plants grown in such soil that showedno infection whatsoever. Less success in producing wilt wasobserved as the season progressed. It remains a question whetherthis is due to a loss in vitality or to a gain in resistance in the plants,due to a change in the soil, tubers, or the organism. Whether the success in producing wilt with F. trichothecioidesand the apparent waning of this power is due to a gain or regain ofvirulency and a subsequent loss again is also an unanswered question.Sherbakoff (33), working with Fusarium spp., got uniformly nega-tive results so far as producing wilt is concerned, and concludedthat the results were due to a loss of virulency of the cultures or tosome other important factor that had escaped attention. Summary It is quite apparent that some of the strains of F. oxysporum cancause tuber rot; that they can destroy tubers entirely without theaid of other Fusarium spp. or bacteria; that at least one Fus

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