322 



THE MONTHLY BULLETIN. 



tent or if the trees are strong enough to allow them to support the 

 tents unaided (Fig. 320). 



For ordinary work forty-five-foot tents are commonly nsed and 

 meet all requirements of a full grown orchard, except for unusually 

 large trees, many of which require seventy or eighty-foot tents. It is 

 customary, however, to use two or even three tents together when 

 there is only an occasional large tree. 



Materials. — The life and nature of a fumigation outfit depends 

 upon Ihc quality and care of the tents. Many materials have been 



P'lG. 309. — Marked fumigating tent over tree. (After Pierce, P. C. Jr. Ent.) 



recommended- and )lriedj; army duck; and drills of .various weights 

 being those most used. Special tight-woven drill tents were recom- 

 mended' by fumigating investigators, but these materials, though 

 allowing but a small- escape of gas, have not been able to stand the 

 rough usage. • After several years of trial with the drills it is becom- 

 ing the unanimous opinion of fumigators that by far the best all 

 around tent material is the eight-ounce army duck. Though some- 

 .what coarse and open it is able to hold the gas well and may l>e used 

 almost twice as long as the drills. 



Tents should be ordered a little larger to allow for shrinkage when 

 dipped. 



Dipping. — To prevent moulding antl rotting, new tents are usually 



