10 Fig " Canker,'' caused hy Phoma cinerescens Sacc. 



plate for several days but on October 9 {i.e. when ten days old) numerous 

 small mycelial masses were conspicuous. 



Positive results were obtained in each case where the conidia had 

 been inserted in the wound. The rest all yielded negative results. 



The trees were examined from time to time and the progress of the 

 disease in the inoculated branches noted as follows. 



White Marseilles. 



No. 1. (Branch about 1 cm. diam.) 



Jan. 15, 1915. No change to be observed. 



Feb. 16. No visible canker: no discoloration of the bark but "tendrils" were 

 seen in the neighbourhood of the wound: they were arranged in the form of an 

 irregular ellipse 2-2 cm. x 1-4 cm., elongated in a direction parallel with the axis of 

 the branch. 



Jan. 25, 1916. Distinct sunken canker 4 cm. long and extending laterally 

 three-quarters round the branch. 



No. 2. (Branch about 2 cm. diam.) 



Jan. 15, 1915. No change to be observed. 



Feb. 16. 



March 25. A single tendril of typical conidia was seen at 2 mm. above the wound ; 

 otherwise there was no change externally. 



April 20. The bark round the wound was shghtly depressed below the general 

 surface; the affected area measured 1-5 x 1-5 cm. 



Jan. 25, 1916. Distinct sunken canker 1-5 cm. long and extending one-third 

 round the branch. 



No. 3. (Branch 1 cm. diam.) 



Jan. 15, 1915. No distinct canker {i.e. no sinking or cracking of the bark) but 

 round the wound and extending 1 cm. above and below and 0-5 cm. laterally were 

 numerous small protuberances; one of these pustules removed and mounted in 

 water proved to be a pycnidium containing conidia as described above. 



Feb. 16. Tendrils were issuing from the pustules which now covered an area 

 3-5 X 1-8 cm. 



Jan. 25, 1916. Distinct sunken canker 5 cm. long and extending three-quarters 

 round the branch. 



Brown Turkey. 



No. 1. (Branch 1 cm, diam.) 



Jan. 15, 1915. No change to be observed. 

 Feb. 16. 



Mar. 3. A rather indistinct zone of discoloured bark (darker than the rest) 

 was observed at 3-5 cm. from the wound. 



