New Plant Diseases | Nature

ABSTRACT THE life-history of _Rarnularia onobrychidis_ is described by S. J. Hughes in a recent paper (_Trans. Brit. Mycol. Soc.,_ 32, Pt. 1, 34 ; 1949). This fungus causes a leaf spot of

sainfoin: it produces chains of conidia from spring to early autumn, and also makes sclerotia in winter. The latter remain viable for a considerable period, and produce conidia from the neck

cells. Pathogenicity of the fungus has been proved by inoculation with conidia ; but no perithecial stage has yet been found. Another leaf spot of sainfoin, caused by _Septoria orobina_,

has also been described by the same author (_ibid_., pp. 60–62). W. C. Moore mentions three new fungal plant diseases (_ibid_., pp. 95–99). _Zyihia fragarice_, which is responsible for a

leaf blotch on strawberry, can also produce similar damage on _Geum_. A downy mildew on _Alyssum saxatile_ was found due to _Peronospora galligena_. Downy mildew of the vine, _Plasmopara

viticola_, has probably been confused with powdery mildew on the same host ; but several authenticated records in England are now given. A fourth malady, black heart of potato, is

non-parasitic ; it may be due to unsatisfactory clamping conditions, though it is possible that the symptoms were induced by high soil temperature while the tubers were still attached to

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