THE EFFECTS OF NITROGEN SUPPLY UPON THE VERTICILLIUM WILT OF ANTIRRHINUM

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Abstract
Isolates of Verticillium albo‐atrum, V. dahliae and V. nigrescens grown on media adequately supplied with sodium nitrate induced wilt rather more rapidly in antirrhinum plants growing in soils with a normal and an excessive amount of nitrogen than in plants in nitrogen‐deficient soil, though plants became diseased in all soils. Similarly treated isolates of V. nubilum and V. tricorpus induced a greater incidence of wilt in plants in soil supplied with heavy dressings of organic nitrogenous fertilizer than in plants in soil deficient in nitrogen, although V. tricorpus from a medium containing much sodium nitrate, in contrast to V. nubilum, was pathogenic to plants in such deficient soil. The ability of the nitrogen‐starved isolates to penetrate the host plant was significantly diminished, and even when wound‐inoculated into stems their effect upon the host was much reduced.

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