Determination of toxicity of gaseous ozone against adult stages of German Cockroach (Blatella germanica L.)

Abstract

In this study, the effects of two different concentrations of ozone gas (16.7 and 33.3 mg / L) against Blatella germanica adults at different exposure times (10, 20, 30, 40 and 50 minutes) were investigated under laboratory conditions. It was determined that the ozone gas had a noticeable effect on mortality of B. germanica adults. In general, ozone gas caused higher paralyisis-mortality rates of B. germanica adults than mortality rates of B.germanica adults at both concentrations and all exposure times. A concentration of 33.3 mg / L of ozone gas with 40 and 50 minute exposure times killed all cockroach adults after 24 hours. On the other hand, 16.7 mg / L concentration of ozone gas with 50 minute exposure time killed 90% of the B. germanica adults after 24 hours. When ozone gas is evaluated in terms of exposure time to B. germanica adults, the concentration of 33.3 mg / L of ozone gas with 10-20 minute exposure times caused 65 % adult mortality, with 30 minute exposure time caused 90% adult mortality and with 50 minute exposure times caused 100 % adult mortality after 24 hours. At a concentration of 16.7 mg / L of ozone gas, as the exposure times increased, the adult mortalities gradually increased after 24 hours and the adult mortality reached 90% with 50 minute exposure times. All these results show that ozone gas (33.3 mg / L) with 40-50 minute exposure times can successfully control B.germanica adults.

Keywords

• ozone gas
• blatella germanica
• mortality
• biological efficacy