Smithsonian Report, 1958.—Knipling PLATE 3 
] 
1. The production of 50 million screwworm flies per week requires thousands of brood 
flies. The adults are held in cages of a different design and larger than shown here, and 
are fed honey and moist ground meat. After about 8 days eggs are obtained by exposing 
warmed screwworm media in the cages. 
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2. The screwworm larvae are reared in large flat vats, as shown. About 200,000 larvae 
are produced in each vat after feeding on the ground meat-blood medium for about 5 
days. 
