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Biological and Life Table Studies of Harmonia axyridis Pallas (Coleoptera: Coccinellidae) Reared on the Factitious Prey, Sitotroga cerealella Olivier (Lepidoptera: Gelechiidae)

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The developmental times of immature stages, survival percent, longevity, fecundity, and life table parameters of Harmonia axyridis were studied under laboratory conditions by feeding on fresh and frozen grain moth eggs (GME), Sitotroga cerealella. The effect of crowding adults on fecundity of females was also determined. The total developmental time from egg hatching to adult eclosion ranged from 18.89 0.32 to 22.5 0.21 days on fresh and frozen GME, respectively. Survival percent from egg hatching to adult emergence was differed significantly when the predator fed on the two diets of GME. Also, pupal and adult weights were affected by feeding on fresh and on frozen GME. There were no significant differences in longevity of females, while there were significant variations in fecundity of females and longevity of males. The calculated values of T, DT, Ro, rm, and erm were high by feeding on fresh GME. Morever, rates of survivorship (Lx), and maximum oviposition per female per day (Mx) were high when the predator reared on fresh than on frozen GME. Crowding conditions of predator adults affected the fecundity of females due to egg cannibalism by both males and females of the predator.


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