Table 



I. — Pel 



rcentage 



oj kill attained 





jector and 2,4, ^-T 



LJ.D.n. 



All 



species 



Beech 



Sugar maple 



class 



Trees 



Trees 



Trees 



Trees 



Trees 



Trees 



( inches ) 



treated 



killed 



treated 



killed 



treated 



killed 





i\0. 



^. 





% 



No. 



% 



1 



23 



96 



5 



100 



8 



87 



2 



47 



64 



16 



75 



23 



52 



D 





oz 



14 



57 



12 



42 



4 



18 



50 



3 



67 



9 



22 



5 



9 



44 







6 



17 



All classes 



134 



66 



38 



71 



58 



47 



inadequate treatment. With larger tree size, even spacing of the injector 

 cuts becomes more difficult, particularly in heavy thickets. Several trees 

 encountered during the tally had not received the prescribed number of 

 injections, and the spacing of injections often was irregular. 



The average overall kill of only 47 percent of the sapling-size sugar 

 maples indicates that a more intensive treatment is required for adequate 

 control of this species. The treatment used here undoubtedly would be 

 even less effective on trees of pole and sawlog sizes. Kills of sugar maple 

 and other hard-to-kill species probably could be substantially increased 

 by closer spacing of the cuts to make complete or almost complete frills. 

 Also, the use of an injector designed so that the operator could control 

 the dosage per cut might result in better kills. 



This test, while limited in nature, does provide useful information for 

 planning future silvicide treatments with injectors in the mountain hard- 

 woods of the northern Appalachian region: 



• Sugar maple is difficult to kill and requires relatively intensive treat- 

 ment. 



• Injector cuts probably should be spaced more closely than they were 

 in this test. 



• Injectors that provide for operator control of the amount of silvicide 

 per cut might be more effective than the tool that we used. 



—CARTER B. GIBBS 



Research Forester 

 Northeastern Forest Experiment Station 

 Forest Service, U. S. Dept. Agriculture 

 Parsons, West Virginia 



3 



