236 FUMIGATION METHODS 
house twice a year, and we test it with smoke before 
we allow it to be used, in order to show the position of 
any possible leakage. For the first two years one or 
two nurserymen blamed fumigation for the death of 
many of their peach trees, but they have now become 
convinced that the damage was done by the very severe 
winter of 1898-99.”’ 
Connecticut.—I have not used the gas against San 
José scale, but have examined stock which had been 
fumigated and could find no living specimens a year 
later. We have used the gas in the tomato forcing 
house, using 3 and 2% ounces of cyanide per 1,000 
cubic feet of space to kill white fly, Alerodes vaporarioum 
Westwood. ‘The plants were slightly injured at the 
top and every insect killed. Have also tried it ina 
barn to kill the clover-hay worm, Pyralis costalis.— 
Prof. W. E. Brirron, State Entomologist, Connecticut. 
Florida.—The following timely account of the 
work in Florida has been furnished us by Prof. S. A. 
Gossard, Entomologist of the Experiment Station: 
‘‘ We commenced some extensive experimentation in 
fumigating orange trees for white fly, Alerodes citri, in 
1900. We found that the treatment destroyed the 
insects—in fact, practically exterminated them—with 
smaller charges than are used by the California people. 
Most of our work was done in the daytime, and 
while I have not seen the treated trees for several 
weeks a report by letter indicates that they are all 
right and have a good set of fruit. The trees dropped 
trom one-fourth to nearly all of their leaves, but put 
out again immediately and seem to have a good set of 
