254 JOURNAL 01? FORliSTRY 



considered absolute limits, but merely to show in a general way that 

 dry air is much more effective than water in producing the death of the 

 larvae at lower temperatures. 



In the dry-air experiments several larvae of Xylotrechus colonus 

 Fab. from hickory were used and the effects were similar to those 

 produced on Neoclytus erythrocephalus. Although it is hardly likely 

 that these same temperatures will be equally fatal to other insects 

 such as those native to the Southern States, it is probably safe to 

 assume that if commercial kiln schedules above Schedule 2 are used 

 on other woods, other species of borers that may be in the wood will 

 be killed. 



