Sublethal effects of ethion and imidacloprid on life table of Cryptolaemus montrouzieri Mulsant (Col., Coccinellidae) in laboratory conditions

Cryptolaemus montrouzieri Mulsant (Col., Coccinellidae) is one of the most important natural enemyPseudococcus maritimus Ehrhorn, which is caused by the indiscriminate use of pesticides kill go. Mealybugare causing the overflow. In this study, life table parameters of adults C. montrouzieri the initial 24 hours oftheir life exposed to LC30 ،of insecticides were ethion and imidacloprid, in the laboratory conditions andconstant temperature of 25 ± 2 ° C, photoperiod 16 hours light and 8 hours of darkness and 70 ± 5 percentrelative humidity in incubators was evaluated. The results showed that sex ratio offspring in the control andtreatments were 74.33, 9.58, 9.53. Basic life table parameters including age specific survival (lx), age specificmortality (qx), survival period (px), mortality at age interval x to (dx) x +1, life expectancy (ex) in controland these treatments were calculated in all cases, the survival rate with increasing age, decreased. lxΣ incontrol and treatment were 33.25, 21.02 and 16.12. Life expectancy for adults on the first day (egg stage) inthe control and treatments LC30 ethion and imidacloprid was respectively 58.49, 48.07, 42.01 daysrespectively

کلیدواژه ها:

Cryptolaemus montrouzieri Mulsant ، life table ، ethion ، imidacloprid