12 



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 protection would be thus secured but there would be less 

 difficulty in removing the Scotch pine, and if desired this could 

 remain until more mature. Its removal would also be accomp- 

 lished with less mechanical injury to the more valuable white 

 pine. 



Experimental Plot No. 4. Similar in general construction to 

 Plots 1 and 2, but with some rapid growing broad-leaf tree re- 

 placing the Scotch pine. It is believed at least equal immunity 

 for the pine or spruce would be secured, but care would probably 

 have to be exercised to prevent some of the pines from being 

 shaded out, An occasional judicial thinning might be necessary, 

 but this should not be carried far enough as to make large open- 

 ings in the cover until the size of the pines (more than thirty 

 feet high) make them comparatively immune from injury. 



There is every reason to believe that any of the experimental 

 plots suggested above would be successful to a considerable de- 

 gree. Perhaps a small percentage of the protected pines would 

 suffer injury, but this percentage would never be great, and in 

 no way compare with the injury in pure plantations or that 

 occurring in the protecting border of trap trees. However, in 

 all cases there should be a systematic effort at reducing the num- 

 ber of weevils by conscientiously collecting and treating the in- 

 fested leaders throughout the plot, and better and more certain 

 results will be secured if the natural growth in the vicinity is 

 treated in like manner. This would require only a few hours', 

 or at the outside only a few days' labor per year especially if the 

 man is equipped with long handled pruning hook. 



