DISEASES OF PLANTS. 539 



nating and growing on agar. These have proved especially useful for the isola- 

 tion from field material of slow-growing fungi which, with the ordinary method, 

 are likely to be overrun by rapidly growing fungi or bacteria. 



The need of a pure culture supply laboratory for phytopathology in 

 America, C. L. Shear {Phytopathology, 5 {1915), No. 5, pp. 270-272). — In a 

 paper read before the American Phytopathological Society at its summer meet- 

 ing, the author called attention to the desirability of the establishment of a 

 culture supply laboratory in this country. 



Studies on Khizopus. — II, Physiological, J. Hanzawa {Mycol. CentbL, 5 

 {1915), No. 6, pp. 257-281). — Concluding his report on studies with species of 

 Rhizopus (E. S. R., 28, p. 745), the author states that all the species used except 

 R. nigricans grew at blood heat, and he divides them into three groups as 

 regards temperature preference. The reactions of the several species to other 

 conditions are summarized. 



All the species studied in this connection were found to grow very well on 

 wounded tomatoes, but poorly or not at all on other living plants or fruits. 



Notes on some North. American rusts with cseoma-like sori, C. A. Ludwig 

 {Phytopathology, 5 {1915), No. 5, pp. 273-281). — In order to record recent 

 observations on North American rusts which have caeoma-like sori, the author 

 presents keys to the different groups, and notes in particular information 

 relating to the species of Coleosporium, Melampsora, and Cieoma. Cceoma 

 dubium, parasitic on the hemlock {Tsuga heterophylla) , is described as a new 

 species occurring in northwestern United States and western Canada. 



Peridermium pyriforme and Cronartium comandrae, J. E. Kirkwood {Phyto- 

 pathology, 5 {1915), No. If, pp. 223, 224)- — As a result of field observations and 

 inoculation experiments, the author considers it strongly probable that P. pyri- 

 forme and C comandrw are alternate phases of the same rust. 



Fungus diseases of Colorado crop plants, W. W. Robbins and O. A. Rein- 

 king {Colorado Sta. Bui. 212 (1915), pp. 54, figs. 26). — A description is given 

 of some of the more common fungus diseases, and of injuries not due to fungi, 

 of agricultural and horticultural plants in Colorado, together with suggestions 

 for their control so far as definite methods are known. Formulas are given for 

 the preparation of the various spray mixtures and applications recommended 

 for use. 



Work connected with, insect and fungus pests and their control, F. R. 

 Shepherd (Imp. Dept. Ayr. West Indies, Rpt. Bot. 8ta. St. Kitts-Nevis, 1913-14, 

 pp. 15, 16). — Notes are given on insect pests of sugar cane on St. Kitts, also on 

 root disease {Marasmius sacchari) destroying or stunting the canes, and on 

 rind disease, which was present in one locality in 1912 but did not appear 

 during the period covered by this report. 



Besides mention of insects injuring cotton, notes are given on a peculiar 

 mottled appearance of the leaves, connected with a stunted growth of the plants, 

 which produced an abnormal number of blooms and bolls, none of which 

 matured. In other places there was a curling or crinkling of the leaves on the 

 upper branches, coupled with entire absence of bolls. This trouble is thought 

 to be the same as the one reported from St. Croix (E. S. R., 31, p. 243), which 

 is supposed to be identical with leaf cut or tomosis described as occurring in the 

 United States. 



Cryptogamic review for 1913, G. Briosi (Bol. Min. Agr., Indus, e Com. 

 [Rome], Scr. B, 13 {1914), II, No. 5, pp. 146-157).— Besides a brief notice of 

 diseases observed in connection with forest, garden, orchard, field, and other 

 plants, about 25 cryptogamic diseases of conifers are listed and given somewhat 

 more extended discussion. 



