236 FUMIGATION METHODS 



house twice a year, aud 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 

 Jose 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 in a 

 barn to kill the clover-hay worm, Pyralis co stalls. 

 Prof. W. K. BRITTON, 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 

 from one-fourth to nearly all of their leaves, but put 

 out again immediately and seem to have a good set of 



