Mating and prey stage affecting life history, reproduction and life table of the predacious mite Phytoseiulus macropilis (Banks) (Acari: Phytoseiidae)

摘要

Two factors were examined to determine their effect on the life history, reproduction and life table parameters in the predacious mite Phytoseiulus macropilis (Banks) in the laboratory. The factors studied included multiple mating and various prey stages of Tetranychus urticae Koch. When females fed on mixed actives (protonymphs and deutonymphs) of T. urticae, the fecundity of females mated more than once was 1.7 times higher than in females mated only once, also oviposition period and adult longevity was longer. The adult longevity and life span of P. macropilis were similar when fed on mixed actives, eggs (0 - 24-h-old) and (0 - 48-h-old) of T. urticae, while both periods were increased and reproduction was higher when fed on older eggs (72-96-h-old) of T. urticae. The total number of eggs deposited by females was significantly higher on eggs of (various iges) than on mixed actives of T. urticae. Life table parameters showed that a diet of (72-96-h-old) eggs of T. urticae provided the longest generation time (11.066 days) and female longevity (33.54 days) as well as the highest intrinsic rate of natural increase (rm = 0.36755) and greatest total fecundity which resulted in the highest net reproductive rate (Ro = 58.4136) value. The adult femaleconsumed daily an average of 6.8 mixed actives of T. urticae during its life cycle, while it was increased to 13.6 during the oviposition period. The daily (72-96-h-old) eggs of T. urticae consumed by female P. macropilis during its life cycle and adultlongevity was significantly higher than that recorded on either (0-24-h-old) or (0-48-h-old) eggs of T. urticae.