34 PATHOLOGY [BoT. Absts., Vol. X, 



PATHOLOGY 



G. H. Coons, Editor 

 C. W. Bennett, Assistant Editor 



(See also in this issue Entries 6, 9, II, 27, 38, 66, 67, 80, 99, 106, 136, 150, 160, 175, 



304, 305, 315) 



PLANT DISEASE SURVEY (REPORTS OF DISEASE OCCURRENCE AND 



SEVERITY) 



184. Bethel, Ellsworth. Notes on the Peridermiums of pines in Colorado and Cali- 

 fornia. [Abstract.] Phytopathology 11: 4.5. 1921. 



185. Dkechsler, Charles. Occurrence of Rhyncosporitun on Dactylis glomerata and 

 Bromus inermis. [Abstract.] Phytopathology 11: 42. 1921. 



186. McCuBBiN, W. A. The present status of the potato wart in Pennsylvania. [Abstract.) 

 Phytopathology 11 : 58. 1921. 



187. Seymour, Edith K., AND Frank T. McFarland. Loss from rye ergot. [Abstract.] 

 Phytopathology 11 : 41. 1921. 



188. Stakman, E. C, R. S. Kirbt, and A. F. Thiel. The regional occurrence of Puccinia 

 graminis on barberry. [Abstract.] Phytopathology 11: 39-40. 1921. 



189. WoLLENWEBER, H. W. Der Kartoffelkrebs, seine Verbreitung und Bekampfung. 

 [The potato canker, its distribution and control.] Zeitschr. Kartoffelbau 1^: 61-64. Fig, 

 1-3, 1921. — Potato wart disease, at first restricted to small plantations, has spread widely 

 in spite of all warnings and exclusion measures and is now a problem for the serious considera- 

 tion of potato growers generally. Disease has been reported from Hungary, England, Scot- 

 land, Ireland, Germany, Newfoundland, Holland, Sweden, Norway, and the U. S. A. It 

 seems to have since disappeared in Himgary and to have been eradicated from Sweden; in 

 Norway and Ireland it has been kept from spreading by fallowing infected land. On the other 

 hand, it has spread widely in England and in Germany, so that in the aggregate 1500 hectares 

 are infested in Germany and 2500 in the northern hemisphere. It is significant that all loci 

 of infection in Europe are found between the 50th and 60th parallels, while in America the 

 altitude of the infested regions is such that it occurs down to 40° latitude. — Sulphur, mercuric 

 chloride, and sulphuric acid have not been effective as soil disinfectants, but Ericksson found 

 the application of 10 1. of 1 per cent formaldehyde per square m. successful in disinfecting soil; 

 also tools and storage bins. The remarkably long persistence of the pathogene in the soil 

 and the fact that the tomato, nightshade, and bittersweet may serve as hosts make starving 

 out processes tedious and uncertain in result. The use of immune varieties is the only practi- 

 cable means of control known. Some immune varieties are of high commercial value, but 

 many have been abandoned by their originators owing to poor yield or susceptibility to other 

 disease. Maximum value in each of these respects, as well as immunity to the wart disease, 

 must be the breeder's goal in future work. A list of varieties immune to wart and of widest 

 adaptability to German conditions of potato culture is given. — F. Weiss. 



THE HOST (RESISTANCE, SUSCEPTIBILITY, MORBID ANATOMY AND 



PHYSIOLOGY) 



190. Crawford, R. F. Overwintering of mosaic on species of Physalis. [Abstract.] 

 Phytopathology 11:47. 1921. 



191. Dickson, James G. The influence of soil temperature on the development of seed- 

 ling blight of cereals caused by Giberella saubinetii. [Abstract.] Phytopathology 11: 35-36. 

 1921. 



