840 EXPERIMENT STATION RECORD. 



DISEASES OF PLANTS. 



The International Phytopathological Convention of Rome and its relation 

 to tropical agriculture, A. G. L. Rogers {Proc. Internat. Cong. Trop. Agr., 3 

 (1914), pp. 109-117). — A brief abstract is given of this paper, which dealt with 

 the history of the movement in favor of international action for control of 

 plant diseases, the congress at Rome in 1914, the inadequate representation of 

 tropical countries, a summary of legislation and regulations at present in force 

 in tropical and subtropical countries, a comparison of these regulations with 

 those contemplated by the Rome convention, and the advantages and disadvan- 

 tages of the proposed change of method. The discussion which followed the 

 paper is also reported. 



Vegetable pathology, D. Bois {Rev. Hort. [Paris], 81 (1915), No. 19, pp. 4^4. 

 405). — The author describes briefly the organization of the Soci^t^ de Patho- 

 logie VC'g^tale, which held its first meeting in Paris in February, 1914. listing 

 the officials chosen thereby and noting the main contents of its first bulletin. 



[Effect of meteorological conditions on development of plant diseases], 

 G. DoKOGiN (Mat. J/jAo?. i Fitopatol. Ross., 1 (1915), No. 2, pp. 3-9, fig. l).—lt Is 

 announced by the author that hereafter the Bureau of Mycologj' and Phytopath- 

 ology of the Russian Department of Agriculture will make a special study of the 

 meteorological conditions of the Petrograd region in their relation to the de- 

 velopment of plant diseases. In order to secure accurate data this study will 

 extend over a period of many years. Tables showing cloudiness, rainfall, depth 

 of snow layer, soil and atmosplioric toniporature, atmospheric pressure, reitera- 

 tion and strength of winds, and certain other factors will be compiled quarterly 

 and published in this journal. The first table, covering the winter months of 

 1914-15, is given with this article. 



The genus Fusarium in plant pathology, G. Gandaba (Mem. y Rev. Soc. 

 Cient. ''Antonio Alzatc," ,i2 (li'l-i). \o. 9-10. pp. J,ir)-J,26). — The author gives the 

 results of an examination attempting to determine the really pathological 

 species of Fusarium so far as plants are concerned, the known synonymy of 

 the same, and the hosts attacked by preference in each case. 



An Asiatic species of Gymnosporangium established in Oregon, H. S. 

 Jackson (U. S. Dept. Agr., Jour. Agr. Researeh, 5 (1916), A'o. 22, pp. lOOS-1010, 

 pis. 2). — A detailed account is given of investigations conducteil by the author, 

 while connectetl with the Oregon Experiment Station, on O. koreccnse, a pre- 

 liminary note of which has already been given (E. S. R., 34, p. 352). 



Pyrenochaeta elodese n. sp., V. Orshanskaia (Mat. Mikol. i Fitopatol. Ross., 

 1 (1915), yo. 2. pp. 35-37, figs. 2). — The above species was isolate<l by the author 

 from Elodca dcnsa, the leaves and stems of which were affected by this parasite 

 and turned yellowish instead of normal bright greiMi. The host tissue was 

 found to be permeated with the fungus mycelimn, which was also growing In 

 flakes on the surface of the plant. A technical description of the fungus is 

 given. 



Bhizoctonia crocorum and R. solani (Corticium vagum). with notes on 

 other species, B. M. Duggar (.inn. Missouri Bot. Gard.. 2 (1915), No. 3, pp. 403- 

 458, figs. 9). — The author presents an account of investigations on Rhizoctonia 

 as a cause of disease in plants, especially of those carrierl out since the appear- 

 ance of his own earlier work with Stewart (E. S. R., 13. p. 55). 



The view that the Rhizoctonia forms on crocus, alfalfa, and some other 

 hosts belong to a single morphological species is confirrae<l. The correct name 

 of the violet root fungus, so long as a spore stage remains uncertain, is held 

 to be R. crocorum. This is known in a few localities in America and widely in 



