Smithsonian Report. 1962. — Christenson 



Plate 4 



Large quantities of experiniental fruit flies arc needed I'ur tests of the radiation sterihzation 

 method. These cages at the Honolulu fruit-fly laboratory contain adult flies which 

 supply large quantities of eggs. (Photo by R, Wenkam, Honolulu.) 



Oriental fruit flies ovipositing through pinholes made in ice-cream cartons inserted inside 

 stock cages at Honolulu fruit-fly laboratory. (Photo by R. Wenkam, Honolulu.) 



