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Development, consumption rate, fecundity and life table parameters of both predatory mites, Amblyseius swirskii (AthiasHenriot)and Typhlodromus pyri Scheuten fed on the phytophagous mite, Petrobia tritici Kandeel, El-Naggar and Mohamed were studied under laboratory conditions of 25±2 o C and 70±5% R.H.. Developmental stages of mite female of both A. swirskii and T. pyri fed on nymphs of P. tritici durated (9.75 and 11.4) days, respectively. Preoviposition, oviposition, postoviposition periods and adult longevity lasted (2.05&1.75); (20.3&16.4); ( 2.55&1.7) and (24.9&19.19.85) days for the two predatory mite species, respectively. The calculated life table parameters were, the mean generation time (T) was (16.33 & 18.55); The doubling time (DT) was (2.75& 4.68); The intrinsic rate of natural increase (rm) and finite rate of increase (λ) were (0.19 & 0.15) and (1.20 & 1.16), respectively; while the net reproductive rate (Ro) was (20.5 and 15.71); and Gross reproductive rate (GRR) was (25.17&18.86) for A. swirskii and T. pyri, respectively. Total fecundity (45.7&34.9 eggs), as well as, total prey consumption (131.8 & 90.2 nymphs) of A. swirskii significantly surpassed those of T. pyri. The two predators were successfully developed from larva to adult when fed on the prey. A. swirskii the best predator to suppress P. tritici than T. pyri.

journal of productivity and development/journal of productivitiy and development

BIOLOGICAL ASPECTS AND LIFE TABLE PARAMETERS ON TWO PHYTOSEIID MITES FED ON Petrobia tritici KANDEEL, EL-NAGGAR AND MOHAMED (Acari: Phytoseiidae, Tetranychidae)