Table 1 — Success of concentrated silvicides 

 in defoliating and killing sugar maple 







: Appli- 

 ' cation 



' Concen- ' 

 : tration ' 



Average : 



volume : 



per tree : 





Conditior 



of 



tree 





Chemical 



3/4 defoliated : 







Dead 





June 1962 



, June 1963 : 



June 1962 



; June 1963 







Percent 



C.c. 



Percent 



Percent 



Percent 



Percent 



2,4-D 



Frills 



100 



28 



93 



87 





30 



80 







50 



28 



73 



70 





3 



57 





Injector 



100 



28 



91 



62 





25 



39 







50 



42 



92 



61 





22 



54 



2,4, 5-T 



Frills 



100 



28 



76 



66 





7 



49 







50 



30 



67 



68 









52 





Injector 



100 



40 



68 



53 



- 



7 



37 







50 



43 



80 



47 





10 



43 



untreated trees; if any root grafts should exist 

 between treated and untreated trees the untreated 

 tree might supply the crown of the treated tree, 

 at least while its xylem cells are still functioning. 



This might prolong the life of the treated tree 

 even though the chemical was successful. In 

 areas where all trees are treated this condition 

 would not exist. 



January 1964 



JOHN Wi BENZIE, 



Research Forester 



Lake States Forest Experiment Station 



STANLEY B./RJNGOLD / 



District Forester 



Diamond-National Corporation 



