DAYLIGHT FUMIGATION, COST OF APPLICATION 89 
fumigating could be done on cool, cloudy days with 
comparative safety. But in Riverside County, where 
the fumigation is almost entirely for red scale, where a 
much greater amount of cyanide is required, and 
where it is necessary to do the work during the warm 
weather, it would certainly be a very unsafe thing to 
FIG. 45—CHARGING A CALIFORNIA HOOP TENT 
do. And theorchardist who attempts it will probably 
be reminded of this fact by having his trees damaged.”’ 
The cost of orchard fumigation depends upon the loca- 
tion of the orchard, the kind and size of the tree, and, 
to a certain extent, upon the prevailing weather condi- 
tions under which the work isdone. ‘The actual cost of 
fumigation is not necessarily very great after the out- 
fit is once secured. With a small number of Emory 
fumigators, or sheet tents, most fruit growers can apply 
