A physiological study of two strains of Fusarium in their casual relation to tuber rot and wilt of potato .. . ^ E Fig. 6.—Wilt and death of potato plants produced in laboratory with Fusariumtrichothecioides, 12 days after inoculation; Early Ohio variety; wilting is restrictedto the side to which inoculum was applied. more rapidly fatal than those in the field. The organisms in thefield work much more insidiously, attacking the roots of the plantslowly but progressively, and permitting the plant, except in extremecases, to readjust for its water requirements. These readjustmentsmanifest themse
A physiological study of two strains of Fusarium in their casual relation to tuber rot and wilt of potato .. . ^ E Fig. 6.—Wilt and death of potato plants produced in laboratory with Fusariumtrichothecioides, 12 days after inoculation; Early Ohio variety; wilting is restrictedto the side to which inoculum was applied. more rapidly fatal than those in the field. The organisms in thefield work much more insidiously, attacking the roots of the plantslowly but progressively, and permitting the plant, except in extremecases, to readjust for its water requirements. These readjustmentsmanifest themselves in the curling and rolling phenomena(figs. 4 and 9). Potato plants in the irrigated sections show this phenomenonnicely. As long as cultivation and irrigation are maintained, theplant develops new roots progressively higher up, and the infected I9i6] LINK—FUSARIUM 185 plants get along fairly well, showing slight curling and wilting,although tuber development occurs. When in midsummer. Fig. 7.—Lesions on stem and roots produced in laboratory with Fiisarium oxy-sporum, 2 weeks after inoculation; Early Ohio variety. i86 BOTANICAL GAZETTE [SEPTEMBER
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