FUMIGATION OF FRUIT TO DESTROY JAPANESE BEETLE 13 



exception of the concrete floor, is coated with pitch to make the 

 chamber practically gastight. It has a capacity of 2.563 cubic feet 

 and can hold one-half carload of berries. 



This plant was in operation during the summer of 1932 and in 

 that time 1,544 crates of blueberries, 251 crates of blackberries, and 

 127 crates of raspberries were fumigated. 



RECOMMENDATIONS FOR THE USE OF CARBON DISULPHIDE 



The fresh fruits considered in these experiments can be fumigated 

 in crates with carbon disulphide in a satisfactory manner for the 

 destruction of Japanese beetles. 



Fumigation house. — The house in which fumigation is to be done 

 must be gastight to prevent reduction of concentration in the carbon 









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Figure 10. — Evaporating pan suspended from ceiling, showing hot-water pipes leading 

 to heating coil. The carhon disulphide is poured into the pan through a pipe in 

 the roof of the building. 



disulphide vapor by seepage through walls, seams, or cracks. Great 

 care should be taken and proper materials should be used in the 

 construction of a gastight room. An ordinary, well-matched ceiling 

 or floor is far from tight. All felt materials are extremely porous 

 and are unsatisfactory for use as packing around doors and other 

 openings. Heavy wrapping paper or two-ply roofing paper of cer- 

 tain brands is very nearly gastight and may be used between layers 

 of boards in the construction of a fumigation house. 



The house must contain equipment for the rapid evaporation of 

 carbon disulphide. The system used in the experimental fumigation 

 house described earlier in this circular is satisfactory for a small 

 plant. The apparatus consisted of a copper coil placed in a shallow 

 copper or galvanized pan, which held the carbon disulphide while it 

 was being vaporized. The copper coil was attached to a hot-water 



