604 



THE MONTHLY BULLETIN, 



Fig. 340 shows the beginning stages of gummosis from one of the 

 inoculations with diseased bark in a healthy eighteen-year-old lemon 

 tree. Fig. 341 shows a cut not inoculated in the opposite side of the 

 same tree, which has healed perfectly. This tree was inoculated at 

 Santa Paula March 8, 1912, by inserting a small bit of bark from a 

 diseased tree. The photograph was taken on June 27th, over three 

 months later. By November the bark was killed over an area of six 



Fig. 342. — Lemon tree inoculated by insertng into 

 liealthy baric a bit of diseased bark from another tree 

 nearly dead with gummosis E^'ebruary 27, 1912. Photo- 

 graphed August 2, 1912, to show the characteristic 

 infection. (Original.) 



inches long and three inches wide, and gum was running out four inches 

 farther up than in the illustration. At the present time the area of 

 killed bark is nine inches long and four inches wide, but the cut (Fig. 

 341) on the opposite side is closed with healthy new bark. 



Figures 342 and 343 show a more rapid development of gummosis as 

 the result of inoculation with diseased bark into a healthy tree at Chula 

 Vista, and is a form of gummosis different from Figure 340. The tree 



