. Fig. 32* Locations in North Dakota where heavy infection of crown rust occurred on buckthorn (1922), after map prepared by V/eniger. Saskatchewan: The aecial stage of this rust was very severe on Rhamnus carthartica in Southern Saskatchewan in early summer. It was eb Abundant that- the buckthorns appeared yellow at some distance. It was present, but less severe, in the northern part of the province. The crov/n rust was very severe in Southern Saskatchewan, and extended northv/ard as far at least as Saskatoon, but not nearly so severe as in the south. (\7. P. Eraser.) References Melhus, I. E.

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. Fig. 32* Locations in North Dakota where heavy infection of crown rust occurred on buckthorn (1922), after map prepared by V/eniger. Saskatchewan: The aecial stage of this rust was very severe on Rhamnus carthartica in Southern Saskatchewan in early summer. It was eb Abundant that- the buckthorns appeared yellow at some distance. It was present, but less severe, in the northern part of the province. The crov/n rust was very severe in Southern Saskatchewan, and extended northv/ard as far at least as Saskatoon, but not nearly so severe as in the south. (\7. P. Eraser.) References Melhus, I. E., 3. M. Dietz and Florence Willey. Alternate hosts and biologic specialization of crown rust in America. Iowa Agr. Exp. Sta. Res. Bui. 72: 2II-23&. Jan. 1922. Parker, J. H. A revi^iW of the literature on the rusts of oats, vdth notes on their distribution in the United States. Proc. Kansas Acad. Soi. 30 (51st-53d Ann. Meet.): 7I-I18. I922. Literature cited: p. 117-ll8«

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