Figure 1. — Left: the silvicide injector. The 

 silvicide in the tube (A) is released by a spring- 

 loaded valve when the semicircular cutting bit 

 (B) is struck into the tree stem. 



Right: the injector in use. Injections should be 

 made as near the ground line as possible, with 

 the injector held at a 45-degree angle. The 

 curved bit makes a cup-like wound that pre- 

 vents runoff of the silvicide. 



Figure 2. — Sugar maple is a hard 

 species to kill. In this tree the 

 cambium has survived and prolif- 

 erated between injector cuts. 



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