No. 2, December, 1921] PATHOLOGY 105 



activity is strongly correlated with growth notwithstanding the higher acidity of the prolif- 

 eration. — Differences in acidity of the varieties of potatoes are not associated with immunity 

 to wart disease. — D. Reddick. 



THE PATHOGENE (BIOLOGY; INFECTION PHENOMENA; DISPERSAL) 



667. Mains, E. B., and H. S. Jackson. Two strains of Puccinia triticina in the United 

 States. [Abstract.] Phytopathology 11: 40. 1921. 



668. Melciiers, L. E. Ecologic and physiologic notes on corn smut, Ustilago zeae. [Ab- 

 stract.] Phytopathology 11: 32. 1921. 



669. Reddy, Chas. H. Experiments with Stewart's disease of dent, flint, and sweet corn. 

 [Abstract.]' Phytopathology 11: 31. 1921. 



670. Thompson, Noel F. The effect of certain chemicals especially copper sulfate and 

 sodium chloride on the germination of bunt spores. [Abstract.] Phytopathology 11: 37-38. 

 1921. 



671. Weber, G. F. Studies on corn rust. [Abstract.] Phytopathology 11: 31. 1921. 



672. Young, H. C, and C. W. Bennett. Studies in parasitism in the Fusarium group. 

 [Abstract.] Phytopathology 11: 56. 1921. 



DESCRIPTIVE PLANT PATHOLOGY 



673. Bethel, Ellsworth, and Gilbert B. Posey. Investigations to determine the iden- 

 tity of a Cronartium on Ribes in California. [Abstract.] Phytopathology 11: 46. 1921. 



674. Broadbent, W. H. Report of the barberry and the black rust of wheat survey in 

 southwest Wales. Jour. INIinistry Agric. Great Britain 28: 117-123. 1 fig. 1921. — A popular 

 account is given of the occurrence of black stem rust (Puccinia graminis) in Wales and the 

 relation of the outbreak to barberry bushes {Berheris vulgaris). — G. H. Coons. 



675. Colizza, Corrado. Sopra una malattia porco nota del Giaggiolo prodotta da Sep- 

 toria Iridis Massal. [Studies on a little-known disease of Iris caused by Septoria Iridis Massal.] 

 Staz. Sper. Agrarie Ital. 53: 494-504. PI. 4, .fig. 1-2. 1920. — The author describes a disease 

 of Iris floreniina and Iris gerrnanica which affects the leaves and flower stalk, invading the 

 parenchymatous tissue but not the fibro-vascular bundles. Under special conditions necrosis 

 due to secondary bacterial infection may set in. The origin is described and apparently is 

 identical with Septoria iridis. No injury to the epidermis is necessarj' for infection to take 

 place, the parasite gaining entrance by way of the stomatal apertures. Drainage and fertili- 

 zation of the soil together with preventive spraj's are suggested as control measures. — A. 

 Bonazzi. 



676. Cook, Mel. T. Blossom blight of the peach. [Abstract.] Phytopathology 11; 

 43. 1921. 



677. Dickson, James G., Helen Johann, and Grace Wineland. Second progress re- 

 port on Fusarium blight (scab) of wheat. [Abstract.] Phytopathology 11: 35. 1921. 



678. Gard, MfiDiiRic. Sur le deperissement des noyers dans quelques regions de la France. 

 [The destruction of walnuts in some parts of France.] Bull. Soc. Path. V(5g. France 8: 41-44. 

 1921 . — Two root rots are described, the 1st attributed to Armillaria mellea and the 2nd of unknown 

 cause, the latter producing an effect somewhat similar to that of the 1st and sometimes con- 

 fused with it, but characterized by gummosis and other distinct sjTnptoms. — C. L. Shear. 



