250 EXPEEIMEXT STATION RECORD. [Vol. 3T 



due to S. rolfsii, which flourishes on wild Crotalaria and probably on various 

 other legumes which may be found growing with tobacco. 



The parasitism of Coryneum on trees and shrubs, G. Abnaud {Bui. Soc. 

 Path. Veg. France, 2 {1915), No. 1, pp. 6^-70, figs. S). — This is a bibliographical 

 discussion of several j^pceies of Coryneum on different hosts named in rela- 

 tion with several other fungus forms. 



Hail effects on trees, G. Abnaud {Bui. Soc. Patt.. Teg. France, 2 {1915), 

 No. 2, pp. 121, 122, pi. 1). — Injuries, particularly to young trees, due to hail 

 driven by strong wind in May, 1915, and observed in July and in October of 

 that year, are described, and resemblances and differences are noted between 

 such injury and the characteristic effects of fungi, in particular Nectria 

 ditissima. 



Behavior of apple canker in two grafts differing in susceptibility on the 

 same stock, P. A. Dangeaed {Bui. Soc. Path. Vcg. Frame, 2 {I'jlo), No. 2, 

 pp. 127, 128). — A case is noted in which two varieties of apple, one very sus- 

 ceptible to Nectria and usually developing canker, and the other ordinarily 

 very resistant thereto, were grafted on the same stock. The resulting growths 

 both showed canker, the originally resistant one, however, in lesser degree. 

 After the removal of the more susceptible half, the new growths on the other 

 portion were free from Nectria. 



A new Oospora on pear, L. Mangin (Bui. Soc. Path. Veg. France, S {1916), 

 No. 1, pp. 9-11, tigs. 2). — A brief account is given of a fungus attacking pear 

 leaves and branches. It is considered a new species and described under the 

 name 0. piricola 



Biological observations on pear rust, \. Trotteb (Riv. Patch Vcg., 8 

 (1916), No. S, pp. 65-76). — A study of p«^ar rust {Rcpstelia cancellata), carried 

 out near Avellino. has convinced the author that normally the fungus can not 

 winter in that host but that its persistence from year to year in a given locality 

 requires the presence of an alternate host. Junipervs sabina Is noted as sus- 

 taining such relation in this locality, though several other Junipers are known 

 to harbor the fungus. 



Disease of apricots in the Rhone Valley. .T. Chikflot and Massonnat (Bui. 

 Soc. Path. Veg. France, 2 (1915), No. 2, pp. 117-120).— Tlils has been pre- 

 viously noted (E. S. R., 35. p. 249). 



Some observations on witches' brooms of cherries, H. Schmitz (Plant 

 ^Vorld, 19 (1916), No. 8, pp. 2S9-242). — The autlior, noting the results of ob- 

 servations and tests made in the course of a michrochemical study of witches' 

 brooms of cultivated cherries due to Exoascus cerasi, holds these re.sults to 

 sustain the claims that witches' brooms elaborate much or all of the food 

 materials needed for their own growth. The increased amount of stored food 

 and resulting high osmotic pressure may account for the prolonged and rapid 

 growth of the dist'u.'ied parts. The fungus disturbs the normal periodicity of 

 the affected region. Chlorophyll is only masked by the re<l color In the leaves 

 on the broom. The retl color is due to acidity in the leaves, which acidity may 

 itself be due either to the hydrolytic iufliience of the fungus on the stored 

 material or on the cell walls, or to an Influence exerted by the fungus in pro- 

 longing the embryonic condition of the leaves and twigs, since even the leaves 

 of the brooms lose their red color upon becoming fully mature. 



The biology of Exoascus deformans and preventive treatment of peach 

 leaf curl, V. Peglion (Staz. Sper. Agr. Itah, 49 (1916), No. S-4, pp. 200-21S: 

 abs. in Riv. Patol. Veg., 8 (1916), No. S, pp. 88, 89).— The Important means of 

 preservation and transmission of E. deformans, the peach lonf curl parasite. 

 Is said to be the ascospores. the effectiveness of these depending largely upon 

 atmospheric conditions. The fungus is best controlled during the winter rest 



