New York Agricultural Experiment Station. 341 



It is convenient to have a box which will hold about 50 cubic 

 feet for use in fumigating very small lots of nursery stock, bud 

 sticks, scions, etc.; then the chemicals can be used at one-half 

 the strength given for 100 cubic feet. A very convenient form 

 has the inside dimensions 2 ft. x 3 ft. x 8 ft. It is long enough 

 to hold ordinary sizes of nursery trees. It may be made air 

 tight by using building paper and matched boards after the 

 manner just described for the fumigating house. It should have 

 an opening low down on one side through which the cyanide 

 may be dropped into the acid after the top of the box has been 

 tightly closed. This opening should be closed by a tight fitting 

 slide as soon as the cyanide has been put into the acid. 



Some fumigating houses are made large enough so that a 

 wagon loaded with nursery stock can be run into the fumigating 

 room. Where this plan is followed the floor of the wagon box 

 or rack should be open enough to allow the gas to pass readily 

 to the lowest part of the load. The fumigation requires no less 

 amounts of the chemicals when there are not enough trees to fill 

 the room. In such a house as this the cost of filling the empty 

 space with gas is so great that some nurserymen believe it is 

 more economical to unload the wagon and fill the room with 

 stock, leaving the wagon outside. 



ACKNOWLEDGMENTS. 



The writer desires to acknowledge with thanks the courtesies 

 extended to him and assistance rendered in the preparation of 

 this bulletin by Mr. F. A. Sirrine, Entomologist for this Station 

 at Jamaica, N. Y.; Mr. E. B. Hart, Assistant Chemist, Geneva, 

 N. Y.; Professor W. G. Johnson, Entomologist of the Maryland 

 Agricultural Experiment Station, and Mr. C. L. Marlatt, First 

 Assistant in the Division of Entomology, Washington, D. C. 



