18 



BULLETIN 1490, U. S. DEPARTMENT OF AGRICULTURE 



Pinholes of these and all other kinds made in timber after felling 

 are preventable by prompt handling and rapid utilization of felled 

 timber. Green logs or bolts, either with or without the bark on, 

 should be placed in the mill pond as soon as possible after being cut, 

 especially during the warm months of spring, summer, or fall, or in 

 damp weather. In the mill pond the logs should be floated in loose 

 booms, so that they can be rolled over and turned to make sure that 

 they are periodically submerged on all sides. The damage can also 



Fig. 19. 



-Grub holes and burrow caused by carpenter bee (Xylocopa sp.) in juniper 

 from Arizona 



be prevented by sawing the logs into timber and lumber as soon as 

 possible. 



If it is not possible to get the logs into the mill pond, they can 

 be sun cured or dried rapidly (10, 11, 15, 16, 17, 18, 19, 20) to bring 

 about conditions unfavorable to insect attack, which is accomplished 

 by peeling them and placing them on "browse" (limbs) on knolls 

 in open places in the sun. Other preventive measures consist of gir- 

 dling before cutting, peeling, cutting, and leaving the tops on for a 

 time before logging or after cutting. Barking the logs will prevent 



