10 CIRCULAR 920, U. S. DEPT. OF AGRICULTURE 
the tent off one tree and lower it onto the next rather than attempt to 
slide it off and on. On most of the trees this could be done only with me- 
chanical tent pullers. The pullers that proved most satisfactory for this 
purpose were made with long booms mounted on surplus army weapon or 
personnel carriers (fig. 6). The largest fumigation booms reached to a 
height of 50 feet. Some of the steps in covering a tree are shown in figures 
6 and 7. | 
Ficure 6.—A, tent pullers constructed on surplus army personnel carriers; B, pulling a tent over 
a tree to be fumigated. 
