11 



white pine. This outer border of white pine would serve the 

 double purpose of a check plot to determine the normal per- 

 centage of infestation in pure stands, and would also serve as 

 trap trees to induce ovipositing. 



The history of this plot would probably be somewhat as fol- 

 low: On account of its more rapid early growth, the Scotch 

 pine would in a few years outstrip the white pine, and by the 

 time the latter had reached a height when it would be attractive 

 to ovipositing weevils, the Scotch pine would act as a cover or 

 protection, so that at worst a much decreased percentage of 

 white pine would be injured. But when Scotch pine reaches 

 a height of 20 or 30 feet its further growth in height continues 

 much more slowly and at this time the white pine would soon 

 overtake and eventually outstrip the other species. But by the 

 could then be cut and used either as cord wood, or converted into 

 time this occurs, it would have reached a height where it would 

 be less liable to weevil injury, and a large percentage would 

 escape unharmed. The Scotch pine having served its purpose 

 box boards or other cheap lumber. The gaps thus made should 

 be immediately planted with new white pine which, growing up 

 under cover, would be nearly immune to weevil injury. 



In the meantime the border of white pine surrounding the 

 plot, from the time the young trees reached a height of 5 or 6 

 feet, would suffer a large percentage of infestation. As soon as 

 the leaders begin to wilt they should be removed from the young 

 tree and treated as previously recommended. Many of these 

 trees would soon become bushy growth, but they should be al- 

 lowed to remain to serve as traps, and as soon as attacked, the 

 infested parts should be removed. The inner border of Scotch 

 pine would serve as a partial barrier and could either be cut 

 when the trees of the same species in the center of the plot are 

 removed, or could remain till the interplanting of white pine had 

 become thoroughly established. 



Experimental Plot No. 2. Similar in general to Plot No. 1 

 but with Norway spruce or other species of spruce replacing the 

 white pine in the center of the plot. The outer border may be 

 either white pine or Norway spruce. 



Experimental Plot No. 3. Similar to Plot No. 1, but with 

 the central area planted with alternate strips of from 2 to 10 



