220 FUMIGATION METHODS 



tent quickly raised and dropped over an adjacent tree. 

 It is quite important to have the pole on the windward 

 side of the tent. 



The trees were fumigated April 19, 20 and 21, 

 using one ounce of potassium cyanide to 75, 100 and 150 

 cubic feet of space respectively. The trees fumigated 

 were peach and pear, several varieties, and the buds 

 were beginning to swell. The outcome of the tests 

 showed clearly that the scale was all killed, even on 

 trees where the gas was used at the rate of one ounce 

 of cyanide per 150 cubic feet of space enclosed. 



