عملکرد کنه شکارگر Neoseiulus californicus پس از 30 نسل پرورش روی گرده تاتوره در مواجهه با Tetranychus urticae

The life table parameters of the predatory mite Neoseiulus californicus McGregor in long-term rearing on thorn apple after 10 generations in shifts of G10-shift1 and G10-shift2, 20 generations in shifts of G20-shift1, G20-shift2, and G20-shift5 and 30 generations in the shifts of G30-shift1, G30-shift2, and G30-shift5 compared to first generation (G1-shift) were determined to evaluate their performance in confronting with the main prey Tetranychus urticae Koch. The developmental time (duration of pre-adult stages) with increasing shifts from G10-shift1 (4.71 days) to G10-shift2 (5.52 days) has increased. No significant difference was observed between the shifts in the developmental time in generation 20, In G30-shift1, G30-shift2, and G30-shift5 the developmental time was 5.03, 5.83, and 4.79 days, respectively. Despite fluctuations, the developmental time decreased as the shifts increased in pre-adult stages. In all generations, there was no difference between oviposition days, female longevity and fecundity of predatory mites in their shifts. In generation 30, there were significant differences in the total life span among different shifts; 24.42, 27.33 and 26.68 days in G30-shift1, G30-shift2 and G30-shift5, respectively. However, there was no significant difference between the shifts in generations 10 and 20. In addition, the population growth parameters of the predatory mite did not show a significant difference in different generations and in their shifts. According to the results of this study, the long-term effect of feeding on thorn apple pollen on the performance and efficiency of N. californicus was very similar in different generations. The transfer of predator mites in generations 10, 20 and 30 from pollen to the main prey T. urticae in the same generations and their shifts showed that the efficiency of the predator did not decrease. Therefore, these findings and the economic cultivation of thorn apple plant show that thorn apple pollen is a suitable diet for mass rearing of N. californicus.