448 EXPERIMENT STATION RECORD. fVol. 3r> 



that different types of this species, while not absolutely immune to pear blight, 

 are very resistant to this disease. In no case did the blight develop in branches 

 more than 0.5 in. in diameter, whereas check trees of Bartlett, Forelle, P. 

 pashia, and French pear seedling inoculated with the same lots of bacteria 

 developed the disease readily and part of them are ah-eady dead. 



As the result of his studies thus far made with blight resistant pear stocks 

 the author finds that no species are absolutely immune to blight, but that in 

 at least three species the blight has been confined to wood not more than one 

 year old. It is suggested that for very cold regions some of the blight resistant 

 forms of the Chinese sand pear (P. sinensis), such as the Japanese pear seed- 

 lings and others of this type, will prove most desirable as stocks. For the 

 warmer regions P. caUeryana and Its various subtypes appear sufficientlj' 

 promising to be thoroughly tested. 



Report on new small fruits, W. F. Allen {Trans. Peninsula Hort. Soc. 

 [Del], 29 (1916), pp. 83-87). — A report on the cultural value of a number of 

 the newer varieties of strawberries. 



Dewberry culture, G. M. Dabrow (f7. S. Dept. Agr., Farmers' Bid. 728 

 (1916), pp. IS, figs. 12). — A practical treatise discussing the history of the dew- 

 ben-y, site of a plantation, soils, preparation of the soil, planting, intercrops, 

 cultivation, cover crops, fertilizers, systems of training and pruning, winter 

 protection, harvesting, yields, diseases and insects, i)ropagation, duration of the 

 plantation, pollination, varieties, and hybrids and related forms. 



A decade of hybridization among American and Leccean vines, G. Cecca- 

 KELLi [Stas. Sper. Agr. Ital., 1,8 (1915), No. 9, pp. 638-6^8) .—The author gives 

 a record of breeding experiments conducted during the period 1904 to 1913. in 

 which different species of American grapes were crossed together as well as 

 with other important hybrids and with native Leccean grapes. 



The grape in Ontario, F. M. Clement (Ontario Dept. Agr. Bui. 237 (1916), 

 pp. 48, figs. 29). — A practical treatise on grape gi-ov.ing based largely on com- 

 merical practice in Ontario and parts of New York State. Articles on Insects 

 Attacking Graiies, by L. Caesar (pp. 39-44) and Grape Diseases, by J. E. 

 Hovv'itt (pp. 44-48) are also included. 



Viti cultural investigations, H. Schellenbekg (Landw. Jahrb. Schweiz, 29 

 (1915), No. 5, pp. 572-586). — A progress report on viticultural investigations 

 conducted at the Wadensweil Experiment Station during the years 1913-14. 



Among the data reported are the cultural value of a number of varieties 

 of grapes, the adaptation of varieties to different stocks, the results of com- 

 bating insect pests and di-seases, and the yields in fruit and juice secured from 

 different grafted varieties. 



Varieties of the avocado, F. O. Popenoe (Altadena, Cal., 1915, pp. 25, pis. 

 2). — This is a reprint of a paper on this subject, read at the meeting of the 

 Avocado Growers' Association at Los Angeles in 1915. See also previous 

 note (E. S. R., 34, p. 835). 



Our present knowledge of citrus fertilization, H. J. Webber (Mo. Bui. Com. 

 Hort. Cal., 5 (1916), No. 5, pp. 161-163). — In this paper the author reviews the 

 results of experiments relative to the fertilization of citrus fruits. 



Sicilian citriculture, G. Inzenga, edited by L. Savastano (Ann. R. Staz. 

 Sper. Agrum. e Frutticol. Acireale, 3 (1915), pp. 1-42, pi. 1). — This comprises 

 a monograph on the various species of citrus fruits which was prepared by the 

 author in 1882 and has not been previously published. 



Lemon growing in Santa Agata di Militello, Messina, G. Faeaci (Ann. R. 

 Staz. Sper. Agrum. e Frutticol. Acireale, 3 (1915), pp. 135-192, figs. 10). — An 

 account of lemon culture in Santa Agata di Militello, discussing soil and cli- 



