542 EXPERIMENT STATION RECORD. [Vol.36 



or used for the growing of stone fruits. The organism is thought to be entirely 

 a wound parasite. 



Resistant stock is regarded as the most hopeful means of control, several 

 varieties of plum being on trial in this connection. Rigid inspection before 

 planting in the fall and again after the active spring gro^^ith sets in is regarded 

 as very important. Tree surgery is considered as on the whole so uncertain 

 and unsatisfactory as to be impracticable. 



North American species of Allodus, C. R. Oeton {Mem. N. Y. Bot. Oard., 

 6 {1916), pp. 173-208). — This account deals with the genetic and host relation- 

 ships, life history, and classification of the genus Allodus, the hosts of which 

 are said to number seven monocotyledonous and 40 dicotyledonous species dis- 

 tributed among 21 families representing 14 orders. 



Some species of Nummularia common in Indiana, C. E. O'Neal {Proc. Ind. 

 Acad. Sci., 191^, pp. 235-249, figs. 15). — Results are given of the examination 

 of five species of Nummularia found at points in Indiana and elsewhere, only 

 one of these, N. discreta, being regarded as of much economic importance. 



The genus Rosellinia in Indiana, G. B. Ramsey {Proc. Ind. Acad. Sci., 1914, 

 pp. 251-265, figs. 9). — A brief account is included of eight species of Rosellinia 

 said to be destructive to living plants mentioned in this connection. 



Correlation of certain long-cycled and short-cycled rusts, H. C. Tbavelbee 

 {Proc. Ind. Acad. Sci., 1914, PP- 231-234).— The author has made a study of 

 several species of Puccinia and furnishes a short list of combinations which are 

 regarded as good correlations. It is thought that the possibilities of correlation 

 studies are very numerous and that the practical application of the knowledge 

 so gained will be made along the lines of culture work, especially in forecasting 

 the alternate host plants of unconnected cecial or telial forms. 



Continuous rust propagation without sexual reproduction, C. A. Lxjdwig 

 {Proc. Ind. Acad. ScL, 1914, pp. 219-230). — The author, presenting data obtained 

 largely from contributions of other investigators, concludes that a good many 

 rusts can pass the winter and propagate themselves for a long time, if not 

 indefinitely, maintaining a high degree of vigor without employing the sexual 

 mode of reproduction. 



Cereal diseases and pests, E. Riehm {Centbl. Bakt. [etc.}, 2. Aht., 44 {1915), 

 No. 14-16, pp. 385-407). — This is a review of contributions by various authors 

 during 1914 regarding injuries done to cereal crops by animal and vegetable 

 parasites and by agencies not parasitic in character, about 124 titles being 

 listed. 



Cereal rusts in subtropical South America, G. Gassner {Centbl. Bakt. [etc.], 

 2. Aht., 44 {1916), No. 9-13, pp. 305-381). — This is a study of the more common 

 rusts affecting economic grains in the La Plata region at ten developmental 

 stages of the plants, as carried out at periods during 1907 to 1910. The account 

 includes also a discussion of climatic conditions in this region, the observed 

 forms and specializations of the rusts, and their relations to particular varieties 

 of the different grains. 



The dependence of cereal rusts upon the development stage of the host 

 plant and upon external factors, G. Gassner {CcntU. Bakt. [etc.'[, 2. Abt, 44 

 (1915), No. 17-23, pp. 512-617). — This is a further report on the study above 

 noted. It deals in considerable detail with the direct and indirect influence of cli- 

 mate, soil, and other factors as related to rust attack, and with the significance 

 in this connection of developmental stages of different portions of the plants. 



Oat smut in Indiana, F. J. Pipal {Proc. Ind. Acad. Sci., 1914, PP- 191-196). — 

 While oat plants from fields of different counties in Indiana, sown with seed that 

 had not been treated, showed proportions ranging from 11 to over 20 per cent of 

 Bmut infection, the proportion was reduced to an average of about 0.3 per cent 



