24 CIRCULAR NO. 127, BUREAT OF PLANT INDUSTRY. 



scurf. Ill three of the barrels that were sorted the following amount 



of Spondylocladmm were found: 



First barrel (by measure), infection with silver scurf 30 per cent. 



Second barrel (by measure), infection with silver scurf. ... 40 per cent. 

 Third barrel (by measure), infection with silver scurf 35 per cent. 



Tliree of the other barrels were emptied and the amount esti- 

 mated. It was approximately the same as in the tliree barrels 

 sorted. The infection in this collection had progressed farther than 

 in the shipment examined from Aroostook County. Tliis was pos- 

 sibly due to the different storage conditions to which the two lots of 

 potatoes had been subjected. Small collections of other lots of seed 

 potatoes from IMaine on which silver scurf was also present were 

 brought to the writer's attention, but the c^uantity examined was 

 insufhcient to make any just estimate as to the amount of this disease. 



Although only comparatively few lots of seed have been examined, 

 yet it is sufficient to show that silver scurf is a common disease on 

 potatoes in Maine and Vermont, two States that furnish a consider- 

 able amount of seed to various sections of the United States, and 

 smce it is present on the seed going out from these two States it is 

 possible that silver scurf is quite generally distributed in the eastern 

 half of the United States. 



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faule.. Berichte, Deutsche Botanische Gesellschaft, Bd. 16, Heft 8, p. 280-281. 



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