DISEASES OF PLANTS. 353 



scribed spet-ies, heuce the author gives it the name E. mall n. sp., the mori»ho- 

 logical and cultural characters of which are described. 



Researches on gum flow and frost injuries to cherry trees, P. Sorauer 

 (Landir. Jahrb., 3!J (1910). No. 2, pp. 259-298, ijIs. 5).— This is a general investi- 

 gation of the various factors that produce gummosis in cherry trees, in which the 

 author discusses individual variations in the normal growth of twigs, the tlow 

 from gum centers in uninjured l)ranches, the predisposition to gummosis of cer- 

 tain tissue groups in healthy branches, and the relation of frost and tension 

 dififerences to gummosis. 



Peach leaf curl, E. Wallace and H. H. Whetzel {New York Cornell 8ta. 

 Bui. 276, pp. 157-178, figs. 8). — The origin, history, and geograi)hical distribution 

 of the peach leaf curl (Exoascus deformans) are discussed, after which an ac- 

 count is given of the disease occurring in New York, its economic importance and 

 varietal susceptibility. The data regarding the susceptibility of varieties were 

 obtained from reports from a large number of growers throughout New York, 

 from which it appears that the variety Elberta is the most subject to the disease. 



Experiments were carried on in lOOS-9 for the control of this disease, in which 

 the trees were sprayed with Bordeaux mixture and lime-sulphur compounds of 

 various kinds. It was found that all the fungicides were efficient in the control 

 of the disease, the time of application being the most important factor. In gen- 

 eral it was found desirable to spray the trees before the buds had begun swelling 

 in the spring. If the spraying is done early and with sufficient thoroughness 

 but little loss need be exi)erienced. 



Taphrina andina n. sp., B. Palm (Svensk Bot. Tidskr., 3 {1909), No. 2, pp. 

 192-195, fig. 1). — The author describes and figures the macroscopic and micro- 

 scopic characters of T. andina n. sp., parasitic on the leaves of Priinm saHcifolia 

 from Ecuador. 



The American gooseberry mildew, Steffen (Prakt. Rathgeher Obst u. Gar- 

 ienhau, 1909, p. 257; alts, in Ztschr. Landiv. ]'ersuchsw. Ostcrr.. IS {1910), No. 

 1, p. 58). — The author claims that this disease is not very dangerous, as it has 

 been repeatedly held in check by proper methods of control. These consist in 

 gathering the berries as green as possible, especially if the mildew was present 

 during the preceding year, cutting and burning all affected canes, spraying 

 every 10 to 12 days with 700 gm. of potassium sulphid to 100 liters of water, 

 and just before the leaves appear spraying with a mixture of Bordeaux mix- 

 ture and potassium sulphid in the proportion of 100 liters of Bordeaux to 300 

 gm. of potassium sulphid. 



The spread of the American gooseberry mildew by means of packing 

 material, N. van Poeteren {Tijdschr. Planteiniekten, 16 (1910), No. 1-2, pp. 

 Ji6-58). — It is claimed that the spores of this mildew may be transported from 

 place to place in the packing material used around plants, which are being 

 shipped, and that the crates, boxes, etc., in which the fruit is shipped may also 

 prove a source of danger. 



The important diseases of the grape, J. Ritzema Bos {TijdscJir. Planten- 

 ziekten, 15 {1909), No. S-5, pp. 95-99, figs. 8).— The author figures and describes 

 the macroscopic characters of the following diseases of grapes: White rot 

 (Coniothijrium diplodiella) , brown rot (Botriftis cinerra or Monilia), powdery 

 mildew {O'idinm tuekerii), dov^'ny mildew { Peronospora viticola), Botrytis rot of 

 the unripe berries, anthracno.se {Glfjrosporium ampelophagum), and black rot 

 ( L(pstadia hidwrUii ) . 



The grape anthracnose in the Netherlands, J. Ritzema Bos {Tijdschr. 

 Plantenziekten, 15 {1909), No. 3-5, pp. 85-9.), fig. 2).— This is a poi)ular descrip- 

 tion of the common grape anthracnose {Glwoaporium ampelophagum), together 

 with directions for its control. 



