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 
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 
345 
41 feet 
64 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 
