Pflanzenkrankheiten. 203 



diseases. Leaf roll Symptoms are generally caused by a disturbance 

 of the water balance of the plant, though the true nature of these 

 Symptoms may be different in different cases. 



These many diseases, which are all characterized by leafcurl, 

 are discussed by the writer in the present paper, especially the 

 socalled leafroll. A brief review of the writers exposure cannot be 

 given; the paper must be read in original. 



M. J. Sirks (Wageningen). 



Barrus, M. F., An anthracnose-resistant red kidney 

 bean. (Phytopathology. V. p. 303—311. 1915.) 



The writer directs attention to the selection of a stain of Red 

 kidney bean (Wells' R. k. b.) that proved to be resistant to 

 anthracnose in a very high degree. In an earlier paper the author 

 showed a great variability in different varieties of beans in their 

 behaviour to different strains of the pathogene cause of this disease 

 Colletotrichum Undemuthianum , but a variety of Phaseolus vulgaris, 

 that was resistant to every strain of this fungus was not found. 



Studies in diseased fields and in artificial inoculations showed 

 the new variety to be practically resistant to all strains of the 

 fungus, that have been employed. Bad effected plants among the 

 resistant ones probably represent impurities in the seed for no 

 great amount of effort has been made in the past to keep them 

 pure. Grosses may have taken place between these beans and 

 the common kind growing in adjoining regions. New efforts are 

 being made tot eliminate mixtures or any plants still showing 

 susceptibilit^T-. 



This new variety, Wells' Red Kidney bean is not resistant 

 to bacterial Blight caused by Bacterium Phaseoli, to brown rot 

 caused by Sclerotinia libertiana, or to the root rots common in 

 some parts of New York. M. J. Sirks (Wageningen). 



Beau verd, G. e t C E. Martiiir QuelquesBasidiomycetes du 

 Platanus orientalis. (Bull. Soc. bot. Geneve. 2. VII. p. 58. 1915.) 



Auricularia Aiiricula Judae, en colonies compactes sur l'une des 

 branches du plus gros platane du quai; ce parasite n'avait guere 

 ete Signale ailleurs que sur le Sarnbucus nigra, oü il n'est pas rare 

 dans nos contr6es. Polyporus sulfureus et P. hispidus Fr., assez fre- 

 quent et atteignant sur les platanes de dimensions souvent remar- 

 quables, et P. varius Fr. Clitocybe fragans dans les feuilles mortes 

 du bosquet des Jordils. Matouschek (Wien). 



Bijl, P. A. van der, Die-back of Apple Trees, caused by 

 Cytospora leucostotna (Pers.) Sacc. (South Afric. Journ. Sc. p 

 1 — 12. 6 pl. 4 text figs. July 1916.) 



The author describes the disease due to Cytospora leucostoma , 

 which attacks, in addition to apple trees, apricot, plum, and peach 

 in South Africa. The only effective method of control appears to 

 be the removal and burning of diseased parts. 



The cultural characters of the fungus on various media are 

 described. • E. M. Wakefield (Kew). 



