Biological and population parameters of Cryptolaemus montrouzieri Mulsant (Col., Coccinellidae), predator of citrus mealybug, Planococcus citri (Risso) (Hom.: Pseudococcidae) in laboratory conditions
2010
Abdollahi Ahi, Gh. | Afshari1, A. | Baniameri, V. | Dadpour, H. | Asadeh, Gh. | Yazdanian, M.
Cryptolaemus mointrouzieri Mulsant (Col.: Coccinellidae) is one of the important predators of the mealybugs, with a wide distribution throughout Iran. In this research, biological and population parameters of C. montrouzieri on citrus mealybug, Planococcus citri (Risso) (Hom.: Pseudococcidae) were investigated under laboratory conditions at a temperature of 24¡¾2¢ªC, 80¡¾5% relative humidity and a photoperiod of 14:10 (L:D) h. One hundred eggs with 24 hours maximum age were selected and reared individually within Petri dishes (10¡¿1.5 cm). The emerged larvae were fed directly by various nymphal instars of P. citri. Developmental time and mortality rates were followed for each larva until the adults were emerged. Ten onedayold pairs of the adult coccinellid were selected and their daily fertility and longevity were recorded. Daily fertility with together preimaginal developmental time and mortality were analyzed based to Carrey method (1993). The results indicated that length of incubation period, first, second, third and fourth larval instars, prepupal and pupal stages were 7, 3.85, 3.42, 2.73, 4.09, 3.6 and 11.74 days, respectively. Total preimaginal developmental time was 36.43 day. Preimaginal mortality and the hatching rate was 27% and 79%, respectively. Intrinsic rate of increase (rm) and finite rate of increase were 0.081 (females/female/day) and 1.08, respectively. Gross reproductive rate (GRR) and net reproductive rate (NRR) were estimated 148.8 and 101.3 females/female/generation, respectively. Doubling time (DT) and mean generation time were 8.54 and 56.9 days, respectively. Net fecundity and net fertility rates were 278.6 and 189.5, respectively.
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