35 2 - 



under proper conditions the winter rot caused by Nectria Solani 

 always developed. In other cases no mycelium could be found, nor 

 did any fungus develop even under favorable conditions. 



Tubers showing this disease were planted, and every tuber pro- 

 duced showed the presence of small spots, indicating that the di- 

 sease is transmitted from seed tubers to the following crop. Where 

 there were no signs of winter rot on the tubers planted the sets 

 produced a perfectly clean crop. 



G. M. Potato diseases. (New Bulletin; The Gardener's Chro- 

 nicle, n. 3608, p. 122). London, Feb. 19, 1910. 



The number of reports issued during 1909 exceeded in number 

 those issued during any previous year. Amongst diseases of po- 

 tatoes a noticeable feature was the great extension of " Corky Scab," 

 caused by Spongospora Solani. On the other hand " Dry Scab " 

 recorded during 1908, was not received at Kew during the past 

 season. A series of experiments on the "greening" of potatos 

 was conducted and results published in the Journal of the Board 

 of Agriculture, vol. XVI, p. 177. An investigation of the fungi 

 causing discolouration on chilled beef from Argentina has also been 

 made. A considerable amount of diseased material from the Co- 

 lonies and outside sources has been submitted to Kew during the 

 past year, including Diplodia cacaoicola, Henn., the cause of a di- 

 sease which is a source of serious injury to Cacao in the West 

 Indies. 



Some Potato-diseases. (Journ. Board of Agr., 1909, N. 8, 

 p. 642-646, pi. i); E. S. R., Washington, March IQIO. 



During an investigation of the prevalence of the wart disease 

 of potatoes (Chrysophlyctis endobiotica} in Great Britain, a number 

 of other diseases were observed to be widely distributed, and brief 

 notes are given on them preliminary to a full report of the inve- 

 stigation. The diseases described are corky scab (Spongospora sca- 

 bies), root rot (Rhizoctonia violacea), leaf blotch (Sporidesmium Solani 

 varians\ blakleg or stem rot (Bacillus phytophthorus), and a disease 

 due to Hypochnus Solani. 



