

III this tnixed stand, low-quality Juirdtvood (red oak) is crowding out white 

 pine. Two weeks after the oak (at left) was treated with sodium -arsenite tabs, 

 its foliage was completely withered. The picture at right shows red oak crowns 

 thinned out with treated tabs to provide increased light for the white-pine 



under story. 



Costs 



The four-man crew progressed at a rate of approximately eight acres 

 per working day of eight hours with smoking pejiods. This resulted in a 

 cost very close to $6.00 per acre including chemical tahs. 



V/hite Pine Pole Stand 



A dense stand of white pine 30 to 40 feet high and 3 to 8 inches in 

 diameter at breast heig'ht was thinned to stimulate diameter growth on the 

 remaining trees. The stand covers an area of four acres. 



Since the crew was experienced, no training period was required. The 

 results were satisfactory as all treated trees showed brown tops after one 

 week, and falling of leaves later on. 



Because of the large number of trees treated, the cost per acre was the 

 same as that on the pine hardwood area where hardwood only was treated. 

 However, pine is mechanically easier to treat and the cost per tree is less. 



Results on Gray Birch 



Twenty-five gray birch trees ranging in diameter from 3 to 6 inches and 

 30-40 feet tall were treated in May, 1952. 



Birch bark is smooth and tears around the tree, consequently three- to 

 four-inch vertical slits were made with a linoleum knife. These allowed the 

 spud to enter between bark and wood for pocket formation. Two to four 

 tabs were inserted per tree, depending on diameter. 



Leaf development appeared normal during the early part of the growing 

 season. Later, browning and falling of foliage occurred in some portions 

 of the crown. 



11 



