H2 
FUMIGATION FOK THE CITRUS WHITE FLY 
experience — obtained l>v measuring the first ten or fifteen trees 
covered, both with the tape and by pacing, and comparing the 
results. In pacing, the actual distance traveled will of course always 
be greater than the circumference as measured by the tape. With a 
little experience the proper allowance can be estimated with sufficient 
accuracy. 
For obtaining the distance over the top of the tented tree the author 
has devised a plan which will so simplify the careful estimation of 
dosage in conjunction with tables such as the one presented in the 
appendix that a far greater uniformity of results and important sav- 
ing of materials will 
follow its adoption. 
This method consists 
in marking the tent 
as shown in figures 6 
and 7 and in Plate 
VII. The tent isfirst 
t hor oughly w a t e r - 
shrunk, after which 
from one to three en- 
tire conspicuous lines 
are painted length- 
wise of the tent for 
the length of the 
full-length strips, 
and one line at right 
angles to longitudi- 
nal line or lines. 
For bell tents and 
sheet tents up to 
about 35 feet in di- 
ameter, one line 
running lengthwise 
of the strips will be 
sufficient, although 
three are preferable. 
For larger sheet tents three lines should always be made. The tent 
may be water-shrunk, if not already so, by allowing it to become 
wet with dew or other means, after which it should be thoroughly 
dried in the sun. The entire tent, or at least the central section 
of full-length strips, is spread flat on the ground, and the middle 
strip with the proper location for a median line is located. This 
line should be painted with a good quality of black paint a (flexible 
paint preferable) about 2\ or 3 inches wide. If three lines are 
j. 
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ABC 
Fig. 6.— Diagram showing method of marking tents to aid in obtaining 
dimensions of inclosed space when covering tree: A A, BB, CC, par- 
allel lines painted lengthwise with the strips of cloth from one "end" 
of the tent to the other; DD, cross-line passing through center of 
tent at right angles to other three. [Figures on lines AA, BB, and 
CC represent the distances in feet from the line DD and figures on 
DD represent distances from line BB. For the purposes of the dia- 
gram these distances are not proportional to the size of the tent.] 
(Original.) 
a Paints containing linseed nil should be avoided. 
