Crown-Gall of Apple and Peach 



TABLE 1. Annual Record cf Growth and Development of Healthy Apple Trees 

 and of Trees Affected with Crown-Gall 



(The trees were set in the spring of 1911 and records were made from 1912 to 1919 inclusive. The final 

 record was made on May 20. 1920. In examining the trees for general condition and appearance, four 

 classes were recognized: e, excellent; q. good; /, fair; p, poor. Healthy trees are designated by an asterisk) 



Variety 



Northern Spy. 

 Northern Spy . 

 Northern Spy . 

 Northern Spy. 



Northern Spy . 

 Wealthy 



Wealthy. 



Wealthy. 

 Wealthy. 

 Wealthy. 

 Wealthy . 

 Wealthy. 



Twenty Ounce. 

 Twenty Ounce. 

 Twenty Ounce. 

 Twenty Ounce. 



Wagner 



Wagner 



Wagner 



Wagner 



Wagner. 



Wagner. 

 Wagner . 

 Wagner. 



Baldwin . 

 Baldwin . 

 Baldwin . 



Loca- 

 tion 



A-l 

 *A-3 

 A-5 

 A-7 



A-9 



A-2 



A-4 



*A-fi 

 A-8 

 B-l 

 B-3 

 B-5 



C-8 



D-l 

 D-3 

 D-5 



C-l 

 C-3 

 *C-5 



General condition of growth for the 

 respective seasons 



1912 1913 1914 1915 1916 1917 1918 1919 



Condition of roots at 

 digging time 



g. No gall 

 e. No gall 



e. No gall 



f. Hard gall at crown, size 

 of a liter flask 



g. No gall 



g. Small galls on one large 



root 

 g. Two small hard galls 



at crown; small galls on 



two roots with hairy 



root 

 g. No gall 

 e. No gall 

 e. No gall 



e. One hard gall (egg') on 



trunk; smaller galls on 



several roots 

 e. No gall 

 e. No gall 



Broken off at crown 

 g. No gall 

 g. No gall 

 g. No gall 

 e. No gall 

 g. Remnant of hard gall in 



crown; small galls (egg) 



on two roots 

 g. Hard gall (egg) in 



crown and on one root; 



small gall on one root 

 g. No gall 

 g. No gall 

 g. One small (metastatic?), 



recent, hard gall on 



trunk above ground 

 e. No gall 



e | g. No gall 



' Girdled by borer; removed October 11. 1916; gall in crown 8 centimeters in diameter. 

 s Girdled by mice; removed May 28, 1915; gall enlarged. (See figure 2.) 



