Abstract
The LD-50 of gamma radiation from cobalt-60 against the body louse (Pediculus humanus humanus L.), house fly (Musca domestica L.), American cockroach (Periplaneta americana (L.)), German cockroach (Blattella germanica (L.)), firebrat (Thermobia domestica (Pack.)), bed bug (Cimex lectularius L.), and Pharaoh ant (Monomorium pharaonis (L.)) ranged from 130 r for half- day-old house fly eggs to 190,000 r for body louse nymphs and Pharaoh ant queens. Doses required to cause 100% mortality ranged from 600 r to 250,000 r. Among the species tested, the LD-50 varied inversely with the size of the insect. Reproduction in body lice was inhibited at dosages of 75,000 r or higher. DDT resistant body lice were as susceptible to gamma rays as non- DDT-resistant lice.
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