10 



might be possible. Most of the pine is there planted in blocks of 

 pure white pine, Scotch pine, or Western yellow pine. How- 

 ever, in a small part of the plantation a dozen or so rows occur 

 between two larger blocks of Scotch pine, and in still another 

 place white pine and Scotch pine were planted in alternate 

 rows. When examined, the injury by the weevil was serious 

 in all of the blocks of pure white pine, while the other species 

 showed no evidence of its attack. In the small block of white 

 pine, surrounded by Scotch pine, only a few leaders were killed, 

 while in that plot where the two species had been planted in 

 alternate rows, no evidence of attack by the weevil was found. 

 The two sorts of pine had been planted at the same time, but 

 the Scotch pine, on account of its more rapid early growth, had 

 outstripped the white pine and, at the time observations were 

 made, was several feet higher. The protection of the white pine 

 from beetle attack was probably due either to the higher, denser 

 growth of the other species, or possibly the odor of the Scotch 

 pine predominated and acted as a deterrent to the weevil. It is 

 probable that both factors aided. The higher leaders of the 

 Scotch pine protected the white pine by inducing the weevils 

 to alight upon them, it being common observation that up to a 

 height of 20 feet, the higher leaders in a plantation are more 

 often chosen for ovipositing. The weevil, however, having 

 alighted on a Scotch pine, found it undesirable for ovipositing 

 and soon sought further. 



It is the belief of the writer that a system of planting white 

 pine can be devised which will give a large measure of protec- 

 tion to the young trees during the period when they are most 

 susceptible to weevil injury. However, it will require a number 

 of experiments carried out over a long period before the best 

 system could be decided upon. Several experimental plots are 

 suggested below. In all cases the rows should be laid out at 

 right angle to the prevailing winds during the active period of 

 the weevil. 



Experimental Plot No. 1. A plot of a minimum of several 

 acres planted 6'x6' as follows: The center of the plot to be 

 planted with alternate rows of Scotch pine and white pine, sur- 

 rounded by a border of at least six rows of Scotch pine, and this 

 in turn surrounded by another band of at least six rows of pure 



