Murphy — The Sources of Infection of Potato Tubers. 361 



Table II. 



Experiment A (1919) on the digging of potatoes at the Experimental Station, 



Charlotteto'wn, Prince Edward Island, Canada. 



Table III. 



Experiment B (1919) on the digging of potatoes at the Experimental Station, 



Charlottetoivn, Prince Edward Island, Canada. 



Plot. 



Stalks allowed 

 to stand until — 

 (represented by 



) 



Potatoes left 



undug until — 



(represented by 



) 



Remarks. 



Percentage weight of 

 crop blighted. 



In 



field. 



To 



Nov., 

 1919. 



Total. 



Net weight 



sound 



potatoes in 



Nov. 



Avg., 3 plots. 



lb. 



Date of S.^ 

 Digging, ^ -' 



Tubers buried in 

 soil again. 



Soil sprayed : 

 Bordeaux mi.xtiire 



Dug after frost. 



8-7 



4-7 



3-7 



00 

 11-9 



5-9 



3-3 

 2-4 



21-7 



35-6 



3-9 



14 '6 



8-0 

 6-1 



21-7 

 35-6 

 15-8 



89 



118 

 113 



104 



91 



123 



' A very small amount of disease found in the tubers in the field was not recorded 

 separately, but it is included in the total. 



