48 EXPERIMENT STATION RECORD. 



peculiar wart-like excrescences on the leaves of oranges is reported from Cen- 

 tral Angoniland, but so far no fungus or other growth has been found associated 

 with this trouble. A blackening and dying of the shoots of young camphor 

 trees is reported, due to some indeterminate cause, as is also a spasmodic 

 disease of tea, in which a shot hole effect is produced on the leaves. 



Some fung-i parasitic on tropical plants, E. Griffon and A. Maublanc (Bui. 

 Trimest. Soc. Mycol. France, 29 (1913), No. 2, pp. 2U-250, pi. 1, figs. 2; ahs. in 

 Internal. Inst. Agr. [Ronie'\, Mo. Bui. Agr. Intel, and Plant Diseases, 4 (1913), 

 No. 7, pp. 1120, 1121). — The authors report as the result of their study of 

 material sent from the mouth of the Amazon that Dothidella ulei in its vari- 

 ous forms is found living parasitically on leaves of Hevea brasiliensis. It 

 seems to be harmless under normal conditions although nursery plants, as in 

 case of some examined, may suffer considerably from its presence. 



On leaves of Butyrospermum parkii from near Kulikoro (Upper Senegal 

 and Niger), were found 2 fungi considered to be new and described under the 

 names of Fusicladium hutyrospenni and Pestalozzia heterospora. 



Handbook of fung'us diseases of the potato in Australia and their treat- 

 ment, D. McAlpine (Melhoume: Dept. Agr. Victoria, 1912, pp. Ill +215, figs. 

 158, map 1; rev. in Nature [London^, 92 (1913), No. 2289, p. 27).— In this book 

 the author gives detailed accounts of the diseases of the potato, particularly 

 those caused by Phytophthora infestans, Alternaria solani, Riiizoctonia sp., 

 Fusarium solani, Bacillus solanacearum, and the diseases known as scab. 



Bacterial disease of potatoes, T. G. B. Osbobn (Jour. Dept. Agr. So. Aust., 

 17 (1913), No. 1, pp. 19-21, fig. 1). — Specimens of potatoes attacked by the 

 bacterial rot (Bacillus solanacearum) were submitted to the author for study, 

 and it seems that this disease has become established in South Australia. 

 The disease occurs also in Victoria, where it is popularly known as sore eyes, 

 from the moist condition of the buds in the early stages of the rot. 



Suggestions are given for the control of the disease, which include the 

 removal and burning of infected plants, the use of clean seed tubers, and the 

 rotation of crops. 



Report of the committee for study of leaf roll. — VII, Biolog-y of the potato 

 plant with particular reference to leaf roll, O. Reitmaik (Ztschr. Landw. 

 Versuchsw. Osterr., 16 (1913), No. 6, pp. 653-717).— Besides a discusssion of 

 statements by other investigators, the author gives in continuance of previous 

 reports (E. S. R., 27, p. 447) the results obtained in a series of recent inves- 

 tigations. He states in conclusion that while leaf roll is a relative term ren- 

 dering reports by various observers uncertain or conflicting in cases not very 

 marked, it may be stated with a degree of certainty that instances of transitory 

 leaf roll or of recovery in well established cases have not been seen by him ; 

 that this trouble normally shows itself relatively late in the development of 

 the potato plant, usually near the middle of June, when individuals which 

 have inherited this trouble in typical degree show along with precocious bloom- 

 ing a development of storing organs and marked setback in growth of the 

 plant, especially as regards the root system; that as soon as the other signs 

 of leaf roll appear, a disturbance or checking of the transportation of elaborated 

 materials from the leaves is observable with alterations of phloem, concerning 

 which further study is regarded as desirable; and that considerable varia- 

 tions are observable as regards the degree of susceptibility of different varie- 

 ties of potatoes to this trouble. 



The recent researches of Quanjer as to the cause of potato leaf roll and 

 Sorauer's standpoint, P. Sorauek (Ztschr. Pflanzenkrank., 23 (1913), No. 4, 

 pp. 2Jf4-253). — A critical discussion of an article previously noted (E. S. R., 



