196 
F. T. Brooks . 
plant was dug up but all the tubers were sound and there was no 
discolouration of the stem below soil level. 
All the other plants in this area containing last year’s blighted 
tubers, shewed one or more leaves—especially the lower ones, 
attacked by Phytophthora on this date, but no plants outside this 
area, whether Dunbar or other variety, were affected. The owner 
picked off all the diseased leaves the same evening. 
- P^-r ? - ED 
July 24. The same area shewed a slight increase in the 
number of affected leaves but these were picked off every morning* 
No plants were affected outside this area. 
July 29. There was about twice as much leaf infection as 
that visible a week ago but it was still confined to the same area. 
July 30. There was some increase in the amount of infection* 
July 31. Some of the leaves of Great Scot plants adjoining the 
affected area shewed blight spots. 
Aug. 2. The disease was now present on the leaves at the 
