Effects of high and low temperatures on development time and mortality of house dust mite eggs |
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Authors: | Vanna Mahakittikun John Joseph Boitano Prapakorn Ninsanit Teerapong Wangapai Kornraphat Ralukruedej |
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Institution: | (1) Biological Control Centre for Africa, International Institute of Tropical Agriculture, 08 B.P. 0932, Cotonou, Benin, West Africa |
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Abstract: | The generalist predator Amblyseius
swirskii is an efficient natural enemy of small insects and phytophagous mites, particularly thrips and spider mites. This phytoseiid
species was considered for a long time as a subtropical species and Amblyseius rykei as a sub-Saharan African species. A recent revision of phytoseiid species of the subtribe Amblyseiina from sub-Saharan Africa
Zannou et al. (Zootaxa 1550:1–47, 2007) determined that the two species are identical and synonymized them. To confirm or invalidate that morphological study, we
crossed a Benin population of A. rykei and an Israel population of A. swirskii through two generations and back-crossed their hybrids to their parents. We also compared demographic parameters of both
species on maize pollen, and their predation and oviposition rates on first larval instars of Frankliniella occidentalis. All females of homogamic and heterogamic crosses produced viable progeny, fertile F1 and viable F2. All the laid eggs hatched
and sex ratio was female-biased for all crosses. Demographic parameters of the two species on maize pollen, and their predation
rates and development times (egg to adult) on first instars of F. occidentalis were similar. Only oviposition of A.
swirskii on larvae of F. occidentalis was significantly higher than that of A. rykei. These results indicate that A. rykei and A. swirkii are conspecific, and thus are a single species as concluded by Zannou et al. |
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