162 FOREST PROTECTION AND CONSERVATION 
a check plot to determine the normal percentage 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 follows: 
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 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 could then be cut and used either as cord wood, 
or converted into 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 pércentage 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 allowed 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 Norwav spruce. 
Experimental Plot No. 3.—Similar to Plot No. 1, but with the 
central area planted with alternate strips of from 2 to 10 rows 
each of white pine and Scotch pine, or of Norway spruce and 
Scotch pine. It is believed that not so high a percentage of pro- 
tection would thus be secured but there would be less difficulty in 
removing the Scotch pine, and if desired this could remain until 
