648 EXPERIMENT STATION RECORD. [Vol.36 



the planting of beans, lettuce, cucumbers, eggplants, etc., which are known 

 to be attacked by this fungus. 



Physiology of Bacterium malvaceanun, R. C. Faulwettek {South Carolina 

 Sta. Rpt. 1916, pp. ^9-64). — Results of a laboratory study on the physiology of 

 B. nialvacearuni, the cause of the angular leaf spot of cotton, are given, the 

 studies having been conducted in the hope that some insight into the factors 

 as related to parasitism might be secured. In order to obtain data regarding 

 parasitism it is considered important to know the normal physiology of the 

 parasite, its development, dissemination, and control. The author describes 

 the morphology and physiology of the organism when grown in various media, 

 the inhibiting factors of its growth, viability in cultures, etc. 



A rot of endive, J. Ritzema Bos (Tijdschr. Plant enziekt&n, 21 {1915), No. 

 5-6, pp. 169-186). — A rot of endive is described as due to the fungus Marssonia 

 panattoniana. 



Studies upon the blackleg' disease of the potato, with special reference to 

 the relationship of the causal organisms, W. J. Mokse {U. S. Dept. Agr., Jour. 

 Agr. Research, 8 {1911), No. 3, pp. 79-126). — After giving a historical review 

 of this potato disease, its character and appearance, geographic distribution, 

 economic aspects, etc., are described. On account of its resemblance to a disease 

 reputed to be due to different species of bacteria, the author has made a study at 

 the Maine Experiment Station of the various organisms that have been isolated 

 and described, in different parts of Europe and Canada, as being the cause of 

 the blackleg of the stem of the potato and the attendant decay of the tubers. 

 For this purpose material for study was obtained of Bacillus atrosepticus, B. 

 phytophthorus, B. solanisaprus, and B. melanogenes, comparisons being made 

 with material isolated by the author from diseased potatoes in Maine. The 

 morphology, cultural relations, physical and biochemical characters, and patho- 

 genicity of the different species are described at length. 



From the tests made under the same conditions the author concludes that 

 cultures received under the names B. atrosepticus, B. solanisaprus, and B. 

 melanogenes, together with three strains of organisms isolated from potato 

 plants in widely separated parts of Maine are apparently identical and should 

 be classed as one species, or at most, as strains of a single species. The organ- 

 isms received from two sources, under the name B. phytophthorus, proved to be 

 not alike, nor did they agree with that species as originally described. 



Concerning the nomenclature of the species the author has adopted the name 

 B. atrosepticus, and a revised description of the organism is given. 



Potato wilt and tuber rot caused by Fusarium eumartii, R. J. Haskell 

 {Phytopathology, 6 {1916), No. 4, pp. 321-327, figs. 3).— The author reports on 

 the pathogenicity of a species of Fusarium on the vines as well as on the tubers 

 of potato plants. 



The disease was first noted on tubers in the winter of 1914, and a fungus 

 isolated which seems to be identical with that described by Carpenter (E. S. R., 

 84, p. 246). As a result of pure culture inoculations, both in the greenhouse and 

 out-of-doors and on sterilized and unsterilized soil, it is demonstrated that F. 

 eumartii may produce both a wilt of the potato vine and a rot of the tuber. 



History and cause of the rind disease of sugar cane, J. R. Johnston {Jour. 

 Bd. Comrs. Agr. P. R., 1 {1911), No. 1, pp. Il-Jf5, pi. i).— The symptoms of the 

 rind disease of sugar cane due to Melanconium sacchari are described. The 

 author claims that this organism is a wound parasite capable of infecting cane 

 only through wounds or cane that is in an otherwise unhealthy condition. It 

 may, however, become actively parasitic on certain varieties of cane which are 

 characterized by weak, soft growth. 



