Host Alternation of Spruce Broom Rust

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Science  18 Aug 1961:
Vol. 134, Issue 3477, pp. 468-469
DOI: 10.1126/science.134.3477.468


Repeated inoculations demonstrate that Peridermium coloradense A. & K. is the gametophytic stage of Chrysomyxa arctostaphyli Diet., previous reports notwithstanding. Thus C. arctostaphyli is eliminated as the only familiar exception to Transhel's law, which may apply universally to microcyclic rusts.