DISEASES OF PLANTS. 849 



is given of the leaf blight, commonly known also as yellow leaf or shot-hole, 

 of plums and cherries, due to CyHntlro.sixnium iHuU, which is said to attack 

 not only the sweet cherry, but some of the wild cherries, and is quite common 

 on sour cherries and certain varieties of i»lums. 



Symptoms of the disease and methods of control are discussed at length. 

 It is said that both liordeaux mixture and lime-sulphur solution may be used 

 for the control of this disease. A 5:5:50 solution of Bordeaux mixture or a 

 lime-sulphur solution at a strength of 1 gal. to 50 gal. of water are recom- 

 mended. The addition of granulated iron sulphate to the solution is said to 

 prevent the danger from burning and also to increase the sticking qualities of 

 the solution. 



Diseases of young grapevines, L. Kavaz (Prog. Agr. et Tit. (Ed. VEst- 

 Centre), 35 (WUf), No. 1, pp. 3-6, pi. 1, figs. //).— This is mainly a brief review 

 of recent work and conclusions by several investigators nametl, most of whose 

 contributions have already been noted. 



Recent observations on Stilbura flavidum {Agron. Colon., 1 {1913), No. 6, 

 pp. 170-181). — This is a brief note regarding the reiwrt by Maublanc and 

 Rangel, previously noted (E. S. R., 30, p. 652). 



[Notes on tea diseases], A. C. Tunstall {Ind'ian Tea Assoc, Sci. Dcpt. 

 Quart. Jour., No. 3 {1912), pp. 19, 80).— The author reports that the principal 

 tea blights noted on a recent tour in northern Terai were red rust and a root 

 disease caused by UstuUna zonata (a formula for treatment for the latter 

 being given). Blister blight on two kinds of jungle plants has been showTi to be 

 capable of infecting tea, but attempts to inoculate the former hosts with spores 

 from the latter have not been successful. Investigations regarding the pos- 

 sibility and conditions of spore survival during winter are in progress. 



Leaf roll and starch storing in Syringa, R. Laubert (Gartcnffora, 63 {1914), 

 No. 1, pp. 9-11, fig. 1). — The author describes an abnormality of lilac leaves 

 characterized by paleness of the outer portions, rolling and stiffening in mid- 

 summer or earlier, follo\ved by their death and fall in July or later. No 

 pathogenic organisms were found, but tests showed abundant presence of starch 

 in the discolored portions. The trouble is thought to be of physiological char- 

 acter, possibly due to unfavorable culture methods. 



Immunity in plants, H. Ordnung {Mitt. Deut. Dendrol. OeselL, No. 22 

 {1913), pp. 172-176). — The author discusses the occurrence of the oak mildew 

 {ilicrosphwra quercina), the white pine blight {Croimrtium rihicola) . and 

 other parasitic diseases of forest trees, calling attention to their destructive 

 occurrence in some localities upon certain species or varieties, while other host 

 plants are more or less immune to attack. In the case of some of the species 

 he thinks the extension of industrial works has, through their smoke, weakened 

 the trees and made them more subject to fungus attacks, which are said to 

 be always most severe on the first appearance of a fungus in epidemic form. 

 Later, by acquired inununity through the elimination of the weaker individuals, 

 a considerable degree of resistence is produced. 



An investigation on the methods of propagation of mistletoe and the 

 injury caused by that parasite {Bui. Mens. Off. Renseig. Agr. [Paris], 13 

 {1914), ^^0. 2, pp. 132-181). — The results are given of an inquiry made of the 

 directors of agriculture and foresters of different departments and conserva- 

 tion areas of France regarding the host plants, distribution, effect, etc., of 

 mistletoe. 



According to the reports, it is found very rarely on the oak, somewhat more 

 frequently on maple, beech, alder, etc., and quite commonly on some of the 

 species of Populus and on certain fruit trees. The nature of the soil in which 

 the host is growing does not appear to influence its occurrence and it is seldom 



