42 A " Wither Tij) " of Plnm Trees 



Branch II. 



The branch was dead from node h to the tip {i.e. branch girdled at h). 

 Gum was oozing from the dead spur at node c. 



Branch III. 



(a) Spur dead but no canker present on the branch. 



(6) and (c). Both spurs aHve {i.e. leaves showed no signs of wilting) 

 but the flowers had been killed so no fruit had set. 



{(l) Spur dead: there was no evident canker at this node but gum 

 was oozing through the bark just below the node. 



Branch IV. 



(«) Spur dead : a canker half girdled the branch : a large gum globule 

 was present on the branch near the insertion of the spur. 



(6) The leaves at this node were alive: the dead flowers were still 

 persisting and the spur was gumming round the base of the flowers. 



(c) Spur dead: a gum globule was present near the insertion of the 

 pedicels: no canker had developed. 



Branch V. 



This branch was dead from node c to the tip : at d gum was present 

 and an incipient canker was indicated by a slight depression of the bark 

 on the branch round the base of the spur. 



On the rest of the tree at this stage there were only five dead spurs 

 altogether and no branches had been killed except in the case of those 

 produced by artificial inoculation. 



General Results of the Tnoculafion of the Thirty-seven Flowers. 



After inoculation the flowers were not examined until the 3rd day; 

 by that time all the stigmas were brown and, with the exception of six 

 flowers, the discoloration had extended from the stigmas down the styles 

 to a distance of 1 to 5 ram. By the following day the browning had 

 proceeded several millimetres further so that in some flowers it had 

 reached the base of the style and in two cases was encroaching on the 

 ovary itself. 



On the 6th day the ovary in several of the flowers was brown to the 

 base and the discoloration was also to be seen on the exterior of the 

 flower at the point of insertion of the flower on the pedicel and was 

 extending downwards along the pedicel and upwards towards the tips 

 of the calyx lobes. 



