50 
FUMIGATION INVESTIGATIONS IN CALIFORNIA. 
the blossoming period of 1908. Some of the results secured are 
given in the following paragraphs. 
Experiment No. 1. — On February 28 and 29 about one-third of an 
acre of mixed Valencia and Navel orange trees was fumigated at 
Upland, Cal., using dosage rates of 1 ounce and 11 ounces per 100 
cubic feet. The trees were about 12 feet in height. At this time 
the blossoms were just appearing on the trees, none of them being 
far enough advanced to open. The general conditions of the blos- 
soming may be understood by an examination of figure 14. This 
Fig. 14.— Orange blossoms at an early stage of development. (Original.) 
may be considered the tenderest stage of blossoming. An examina- 
tion of these trees two weeks later showed that no apparent injury 
had resulted and that the trees at this tune contained as heavy a 
set of blossoms as the surrounding unfumigated trees. 
Experiment No. 2. — On March 30 fully 1 acre of Navel and Valencia 
orange trees about 10 feet high were fumigated at Orange, Cal.. using 
dosage rates of 1 , 1 ], and 2 ounces per 100 cubic feet. The condii ion 
of blossoming at the time of fumigation ranged from no open blos- 
soms on some trees to full blossoms on others. An examination of 
these trees at a later date showed that with the 1 and \\ dosage 
laics no apparent injury had been done. The 2-ounce rate had caused 
