2l6 FUMIGATION METHODS 



The exposure in each case was one -half hour and one 

 hour. The bud sticks were divided into lots, so that 

 each variety received the maximum and minimum ex- 

 posures of the various strengths of gas. Our bulletin 

 contains a number of tables showing the percentage in 

 each case of the buds that set, and comparisons are 

 made with checks. 



" In all, 4,483 buds w r ere treated, of which 78 per 

 cent. set. The checks numbered 4,864 buds, 85.5 per 

 cent, of which set, making a difference of 7.5 per cent. 

 in favor of the checks. A careful examination of the 

 tables shows that the gas evidently had no effect upon 

 any of the varieties except peaches, which were slightly 

 injured by the 0.30 gramme with an exposure of one- 

 half hour and one hour. In all cases the growth of the 

 treated buds was nearly or quite equal to that of the 

 checks. The conditions of the treated buds were not 

 quite as favorable, after they had been set into the 

 nursery trees, as those of the checks. The treated 

 buds were set a little out of season, somewhat later 

 than the checks. They were also placed about four 

 inches above the checks, where they were too high to 

 be protected by the earth thrown against the trees 

 during the fall cultivation. They were also placed on 

 the furrow side of the trees, thus endangering them to 

 injury during cultivation. These unfavorable con- 

 ditions were probably, in large part, the cause for the 

 failure of the treated buds to set equally as well as the 

 checks." 



Sirrine* s folding fumigator. Another type of 

 fumigator has been developed and used by Prof. F. A. 

 Sirrine, of the New York Agricultural Experiment 



