NRI Differential Sensitivity of Prostephanus 1996

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Date
1996
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Kenya Agricultural Research Institute
Abstract
A study was undertaken of the differential sensitivity of eggs, young larvae, late larvae young pupae, late pupae and young adults of Prostephanus truncatus (Hom) to decreasing concentrations of carbon dioxide (C02) at 25°C and 75 % r.h. Gassing of CO2 was done in a metal drum that permitted controlled leakage of about 5 % every day. Initial concentration of CO2 was 82 % decreasing over various exposure periods to 46.9 %. Eggs were very sensitive to CO2, complete kill was obtained after 4 days exposure. Complete kill of young larvae and young adults was achieved after 8 days exposure. Late larvae young pupae and late pupae showed low susceptibility to CO2 and required longer than 12 days exposure period at CO2 concentration above 60 %.
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