FUMIGATION OF CITRUS TREES. 



15 



on cloth 30 inches wide, and represent the number of linear yards 

 of such cloth required — not square yards. Allowance of an inch to 

 each strip has been made for overlapping edges. These figures are 

 based on the assumption that the cloth is cut without waste. 





Size of tent. 



Cloth 

 required. 

 (30 inches 



wide.) 





Size of tent. 



Cloth 

 1 required. 

 (30 inches 



wide.) 



24 feet. . 





Yards. 

 70 

 105 

 155 

 195 

 215 

 235 



48 feet.... 





Yards. 

 ' 265 



30 feet.. 





52 feet.... 





315 



36 feet 





55 feet. . . 

 64 feet 





345 



41 feet... 



470 



43 feet 



72 feet 





590 



45 feet 









Size to purchase. — Most of the tents in southern California are 

 of either the 36, 41, 43, or 45 foot sizes. Few tents of less than 36- 

 foot size are constructed. Outfits or parts of outfits having tents of 

 48, 50, 52, and various other sizes as high as 84-foot are known. The 

 number, however, is comparatively small. The size of tent required 

 depends on the size of trees in the orchard or orchards to be fumi- 

 gated. The tents should be large enough to cover the tallest trees. 

 An easy method of accomplishing this, as suggested by Morrill, is by 

 throwing a tape attached to a reel over the top of the tallest tree and 

 measuring from ground to ground. Although the weight of the tent 

 reduces the height of the tree to some extent, nevertheless it is policy 

 to add from 2 to 4 feet to the distance measured by the tape so as to 

 be assured of having the edges of the tent rest well on the ground. 

 If an outfit is to be procured for use in a young orchard, the tents 

 purchased should be large enough to allow for 5 or 6 years extra 

 growth. The average age of a fumigation outfit is from 3 to 5 years, 

 depending, of course, on the amount and character of usage which it 

 has undergone. A well-cared-for outfit used only by a private 

 grower in covering his own orchard should last through 5 or 6 seasons 

 of work. 



Ring attachments and reenforcements. — Small iron rings are some- 

 times attached to tents as catch places for the poles or derrick hooks 

 used in throwing them over trees. These ring attachments are most 

 convenient on tents above 45 feet in diameter, but unnecessary on 

 smaller sizes. An easy and satisfactory method of attaching rings 

 to the cloth, as proved by many years of experience in California and 

 elsewhere, is shown in figure 3. It consists in gathering the cloth 

 of the tent about some object or material, binding the same in place 

 by a stout cord, which also passes through the ring. A tightly rolled 

 wad of some cloth such as burlap is commonly used. Another method 

 well worth mentioning is by means of a piece of manila rope from 



