Biology of The Predator Chilocorus Bipustulatus (L.) (Coleoptera: Coccinellidae) By Feeding On Two Scale Prey Species under Laboratory Conditions

Maher Dakdak, Lauy Aslana, Abdelnabi Basheer

Abstract


The purpose of this study was to determine the better suitable prey for the development and reproduction of the predatory coccinellid, Chilocorus bipustulatus (L.) (Coleoptera: Coccinellidae) on two diaspidid species; Aspidiotus nerii Bouche and Aonidia lauri Bouche (Homoptera: Diaspididae). Life tables were constructed at controlled conditions. The developmental time, longevity, fecundity, hatchability and fertility were determined. Individuals fed on A. nerii displayed significantly shorter larval and generation developmental time (15.11 and 32.26 days, respectively), but higher immature mortality rate (56.54%). The duration of egg and pupal stages and longevity of females showed no significant differences between the two tested preys. On the other hand, females fed on A. lauri displayed significantly higher daily fecundity (7.85 eggs/female), total fecundity (562.4 eggs/female), real fertility (540.97 fertile eggs/female) and hatchability (96.19%) compared with those fed on A. nerii. The results showed that under laboratory conditions, C. bipustulatus developed better on A. nerii, whereas the reproduction was better on A. lauri.

Keywords


Aspidiotus nerii, Aonidia lauri, Chilocorus bipustulatus, development, reproduction

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