An international journal of the Systematic and Applied Acarology Society, published since 1996
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Systematic & Applied Acarology (2006) 11, 159-165
Biology and life table of the predatory mite Euseius aizawai (Acari: Phytoseiidae)
DE-YOU LI, YONG-FU HE & HONG-DU LIInstitute of Plant Protection,Guizhou Academy of Agricultural Sciences,Guiyang 550006,China.
Pollens of 19 plant species were used as diets in a laboratory study of the life history of Euseius aizawai (Ehara & Bhandhufalck) (Acari: Phytoseiidae). The mite ingested pollens of all tested plant species and produced eggs. On eight of them the predator completed all developmental stages, with a life cycle of 5.47±0.88 to 6.95±1.61 days. The longest life-span of adults was observed when feeding on pollens of Coriaria sinica, Zea mays, mixed species and Punica granatum. Larvae had a higher survival rate (70% to 82%) when reared with the pollens of Luffa cylindrica, Trachycarpus excelsa, punica granatum and Betula platyphylla. Longevity of adult females was longer with pollens of Coriaria sinica, Zea mays and mixed species. The oviposition period was from 15.05±4.05 to 25.55±15.25 days, the longest when feeding on pollens of Zea mays, mixed species and Coriaria sinica. Fecundity ranged from 23.50±13.50 to 54.50±19.50 per female and the highest was on pollens of mixed species, Luffa cylindrica and Punica granatum. The sex ratio (proportion of females) was highest when feeding on pollen of Luffa cylindrica. The most suitable range of humidities for egg hatching was 70% to 90%. The net reproduction rate of increase (R0) was the highest on the pollen of Luffa.cylindrica, and the intrinsic rate of natural increase (rm) and finite rate of increase (l) were the highest on the pollen of Trachycarpus excelsa.
Key words: laboratory condition, Euseius aizawai, biology, life table, plant pollen
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