THE SOUTHERN PINE SAWYEB. 55 



scored surface, and in others the strip was covered with brush, these 

 having been recommended locally as remedies. In not a single 



instance was the scoring, either with or without salt, found to 

 deter the larvae in the slightest degree. This method is not r< com- 

 mended. 



Placing logs in water. — Investigation of the method of destroying 

 the larvae in infested logs by placing the logs in water was made at 

 Lumberton, Miss., where logs from the storm-felled trees were 

 placed in the mill pond. The water killed all the larvse in the log, 

 both between the bark and wood and in the wood itself. This 

 method is to he recommended wherever practicable. 



Barking the logs. — Barking the logs is effective up to the time the 

 larvae enter the wood, and for a short time thereafter — perhaps a 

 week. As stated elsewhere, the first part of the life of the larva is 

 spent between the bark and the wood, during which the larva feeds 

 upon the soft inner bark. It is absolutely impossible for the larva 

 to live for the first month of its existence without this soft inner 

 bark to feed upon. Therefore, if the bark be removed from the log 

 during this period all larvae between the bark and wood will be 

 destroyed. As stated elsewhere, the larvae continue to feed upon 

 the inner bark for several days at least, after first entering the wood. 

 The writer determined by experiment that the barking of the log 

 during the first few days after the larvae have entered the wood was 

 effective in destroying the larvae, by cutting off their food supply. 

 At this period the larvae have not gone deeply into the wood, 

 that there would still be a saving if the barking were done at this 

 time. Where this method is practiced as a remedy, it should be 

 done within forty days after the eggs are laid. If trees are felled 

 between March 1 and October 15, egg laying will probably com- 

 mence at once after the trees are down. 



An important point to be taken into consideration in this con- 

 nection is whether or not logs and trees barked to destroy the sawyer 

 can be taken to the mill before the sapwood decays from lying on 

 the ground. As the greater part of the injury by the sawyer is con- 

 fined to the sapwood, there will obviously be little or no saving in 

 barking logs which can not be used before the sapwood is destroyed 

 by decay. 



The writer realizes, also, that in some cases barking may not 

 be profitable for other reasons. The local conditions in regard to 

 labor are often far from satisfactory. And it may be quite impos- 

 sible to assemble enough laborers to bark all the trees felled by a 

 heavy storm in time to save them from injury by the sawyer. It is 

 also true that in cyclone-felled timber the trunks are often so piled 

 up and entangled thai it would be necessary to saw them into logs 

 and separate them before they could he barked. However, taking 

 all these points into consideration, the writer feels that in the 



