98 Nebraska Agricultural Exp. Station, Research Bui. 12 
DESCRIPTION OP PLATE XV 
Cross sections of trunk and branches of Jonathan tree treated as 
described in plate XIV for Ben Davis. 
A. Crown of tree. As in the case of the starved Ben Davis, the 
canker infection emerged at the bottom. However, none of the roots 
were infected. 
B. One section of trunk and eight sections of main limb. 
C. Eight sections of main limb attached opposite limb shown in 
B. The last section was not infected. Infection did not extend as far 
longitudinally or laterally as in the case of the Ben Davis trees treated 
in the same way. 
