Pilzkrankheiten der Pflanzen 
217 
stimmten Unterscheidungsmerkmale zwischen gesunden und kranken 
Pflanzen liefern. Lakon (Hohenheim). 
ORTON, W. A., Potato wilt, leaf-roll and related diseases (U. 
S. Dept. Agr. Bull. 64, 1914, 1—48; 16 pls.). 
In this article several important diseases of Po tato es are con- 
sidered, viz: 
Fusarium- wilt: This disease caused by Fusarium oxysporum is 
widespread in America and is characterized by a wilting and premature 
deatli of the foliage. The vascular area of stems and tubers may become 
brown. It is suggested that measures for control should take into con- 
sideration healthy seed, crop rotation and the development of resistant 
varieties. 
Verticillium -wilt: This disease is due to Verticillium alboatrum , 
and also causes a wilting and premature death of the plants. Dead 
stalks are often of a gray color due to a covering of fungous mycelium 
and spores. The disease should be controlled by the same methods as 
the Fusarium- wilt. 
Leaf roll: The most constant and conspicious Symptom of this 
disease is the upward rolling of the leaves. Badly diseased plants bear 
often no tubers at all or only a few. The disease appears to be inlieri- 
table but not communicable. Fertilizers, especially potash salts tend 
to reduce the presence of this trouble. 
Curly dwarf: A dwarfed development of the entire plant resulting 
in reduced yields characterizes this malady. It appears also to be inheri- 
table and non-parasitic. 
Rosette: The fungus Rhizoctonia is associated with a stunted con¬ 
dition known as rosette of Potatoes. 
Mosaic: The plants wliose leaves are spotted or mottled and more 
or less distorted or wrinkled are suffering from this pathological condition. 
Its cause, communicability, and relation to tobacco mosaic are unknown. 
F. A. Wolf (Auburn. Ala.). 
COOK, M. T. and Martin, G. W., Potato diseases in New Jersey 
(New Jersey Agr. Exp. Stat., Circ. 33, 1914, 3—24; figs. 14). 
This circular contains a populär account of the several Potato 
diseases which occur in New Jersey, together with suggestions for their 
control. Two bacterial diseases and several physiological disorders are 
included. Among the diseases of fungous origin which are briefly con- 
sidered are Scab, caused by Oospora scabies, Powdery scab, Spongo- 
spora subterranea; Potato wart, Synchitrium endobioticum; Scurf, 
Corticium vagum var. Solani; Silver scurf, Spondycladium atromrens; 
Dry rot, Fusarium oxysporum , F. tuberivorum and F. trichothecioides; 
Wilt, Verticillium alboatrum; Early blight, AIternaria Solani , and 
Late blight, Phytophthora infestans. F. A. Wolf (Auburn, Ala.). 
KÖCK, G., Kartoffelschort und Kartoffelkrebs (Zeitschr. Landwirtsch. 
Versuchsw. in Österreich 1913, 16 , H. 10, 1005—1008; 2 Fig.). 
„Krebskranke“ Kartoffeln sandten viele Landwirte in letzter Zeit 
der K. K. Pflanzenschutzstation in Wien ein. Die genaue Untersuchung 
ergab aber, daß oft Kartoffelschorf vorlag. Es wurden also die 
Krankheiten vom Landwirt verwechselt. Da die genannte Station mit 
