44 



SOME INSECTS INJUKIOUS TO FOEESTS. 



mjtTRY TO STORM-FELLED TEMBEB BY THE SOtTTHEBN PINE 



SAWYER. 



Practically all timber felled by the storm of September, 1906, 

 became infested by the sawyer. When the writer reached Bax- 

 terville, Miss., July 6, 1908, the broods had all matured and emerged 

 from these trees. In this vicinity, where most of his investigations 

 were carried on, from 75 to 90 per cent of the trees felled by the 

 storm of April 24, 1908, were infested by the sawyer. Adults were 

 at that time actively engaged in laying eggs in the uninfested trunks 



Fig. 13.— The effect of the storm of April 24, 1908. (From a photograph taken near Baxterville, Miss.) 



and stubs. This continued for the balance of the summer, so that 

 it is safe to say that a very small percentage of the pine timber 

 injured by this storm escaped infestation. The damage to each 

 log infested is the work of the larvae or grubs which mine in and 

 through the sapwood, and even penetrate the heartwood, making 

 large unsightly holes which cause the lumber made from this por- 

 tion of the log to be thrown into the very lowest grade, known to 

 the lumbermen as "No. 2 common." 



