442 EXPERIMENT STATION RECORD. 



June 30. Mduriiins: Dept. Afjr., Jill'i. pp. J-.}). — This is a summary of inves- 

 tigations of fungus diseases made during the first half of 1914. 



A root disease of sugar cane was connected with Marasmius, resembling 

 somewhat M. sacchari, but more the Hawaiian than tlie Javan or West Indian 

 form. Damage is caused by this fungus even in favorable seasons, several 

 varieties being attacked. The fungus may be starved out by elimination of 

 grasses or controlled by the use of quicklime, 3 to 5 tons per acre, or loss may 

 be prevented by the use of resistant varieties. 



K(hI rot (ColIctotricJium falcatum) is reported from several localities. Selec- 

 tion of sound and resistant stock and removal of diseased canes at once and 

 of all canes at cropping time are recommended. A rind disease seems to be 

 associated with Mclanconium sacchari, for which sanitation is prescribed. 



A gumming disease of sugar cane is reported, possibly due to a bacterium, 

 and a bacterial disease sometimes follows red rot. Some leaf diseases under 

 investigation do not appear to occasion much damage. 



The cause of a fungus root disease of citrus x)lants has not been definitely 

 ascertained, but quicklime, forked into the soil, and isolation trenches are 

 indicated as beneficial. 



Collar rot of potatoes, causing somewhat less damage than in ]01.'>, was less- 

 ened by the application of a small quantity of quicklime. 



Hecent advances in our knowledge of the genus Phytophthora, G. H. 

 Pethybridge {Jour. Econ. Biol., 9 {1911t), No. 2, pp. 53-63, pis. 2). — The results 

 of a study of different species of the genus Phytophthora are given, and the 

 author concludes that the genus, as usually understood, contains species which 

 differ from one another fundamentally in the way in which the development 

 of the sexual organs takes place. This difference, it is said, practically compels 

 the splitting of the old genus Phytophthora into two, of which P. erpthroscptica, 

 P. iufcstans, P. pJiascoli, P. colocasicr, P. parasifica, and P. arccce are to be 

 retained in the old genus, while the other species are to be transferred to the 

 genus Nozemia. 



Studies in North American Peronosporales, G. W. Wilson {Mi/cologia, 6 

 (IDl-'f), No. 4, pp. 192-210, pJs. 2). — These brief notes on miscellaneous spec-ies 

 include, among accounts of introduced or native forms, a discussion of the 

 new genus Bremiella ( representetl in America only by B. mcgaspcrma n. sp.), 

 the newly named form Pseudopcronospora huinuli, and the following new 

 species, Peronospora Icpidii, P. chama'sycis, and P. minima, with suggestions 

 as to renaming some other forms discussed. 



Conidium production in Penicillium, C. Thom {Mycologia, 6 (Wl.'t), No. 4, 

 pp. 211-215, flg. 1). — The author describes and discusses some characters, modi- 

 fications, and changes as noted in the conidiophores, conidia, etc., of the forms 

 grouped under the name Penicillium. 



A cancer of plants, R. Regamey (Conipt. Rend. Acad. Set. [Paris], 159 

 {191-i), No. 22, pp. 747-749). — A description is given of a canker-like growth 

 discovered on a young oak tree in the park of Versailles in which proliferous 

 tumors were present. From these tumors the author isolated an organism. 

 Microspira carcinopwus. Inoculation experiments have been unsatisfactory on 

 oaks, but positive results have been obtained where inoculations were made on 

 the common garden nasturtium and on ivies. 



The disease is considered distinct from the crown gall of this country, and 

 the organism is said to be very different from the one causing the latter disease. 



Oat sickness in sandy and clayey soils, J. Hudig (Tcrslag. Landbouwk. 

 Ondcrzock. Rijkslandbouwprocfsiat. [Netherlands], No. 15 (1914), pp. 7.'f-S6).— 

 Investigations previously reported (E. S. R., 24, p. 523; 25, p. 724; 28, p. 520) 



