FUMIGATION" OF FRUIT TO DESTROY JAPANESE BEETLE 



10 feet long, 10 feet wide, and 10 feet high. It had a window in the 

 rear and a door in front. It was gastight, being double-walled 

 throughout, with two-ply roofing paper between the walls, and lined 

 on the inside with galvanized-iron sheets, which were soldered to- 

 gether. The window and the door were made tight by means of 

 rubber gaskets. A hot-water heating system of 24 gallons' capacity, 

 thermostatically controlled, was used to maintain the desired tem- 

 perature (fig. 1, A). 



A galvanized -iron 

 pan, 24 inches square 

 by 4 inches deep, 

 containing 22 feet of 

 half-inch copper tub- 

 ing, through which 

 hot water circulated, 

 was used to vaporize 

 the carbon disulphide 

 (fig. 2, A). A fan 

 (fig. 2, B) was pro- 

 vided for circulating 

 the air in the house. 



EFFECTIVENESS OF 

 CARBON DISULPHIDE 

 AS A FUMIGANT 



In the summer of 

 1929, 165,000 adult 

 Japanese beetles were 

 treated with carbon 

 disulphide in the 

 fumigation house un- 

 der different condi- 

 tions to determine the 

 best conditions for 

 killing 100 percent of 

 a given number. In 

 one series of tests, in 

 which 160,000 beetles 

 were used, 2,000 indi- 

 viduals in cages were 

 exposed directly to 

 the gas in rectangu- 

 lar cages 24 inches 

 long, 11 inches wide, 

 and 14 inches high. 

 The sides and tops of each cage were covered with wire screen and 

 each cage was provided with a door. In. another series of tests the 

 beetles were treated in baskets of fruit. Immediately before treat- 

 ment, several boxes in various parts of each layer of a crate were 

 artificially infested with beetles and enclosed with mosquito netting 

 to prevent the beetles from crawling out. 



In both series the beetles were placed in the fumigation house as 

 soon as the desired temperatures were reached. In each experiment 

 the proper dosage of carbon disulphide was poured into the pan 



Figure 1. — Control room at the experimental fumigating 

 plant : A, Hot-water heating system ; B, hot-water cir- 

 culation pump ; C, circulation pump for evaporating 

 coils ; D, motor for ventilating fan ; E, thermal control. 



