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'Effects of host switching and successive multigenerational rearing of the parasitoid Eretmocerus corni (Hymenoptera: Aphelinidae) on host preference and adaptation' - a #Research article in 'CABI #Agriculture and #Bioscience' on #ScienceOpen:
https://www.scienceopen.com/document?vid=ab8d2640-a752-4767-8d49-f255ccf93360
ScienceOpenEffects of host switching and successive multigenerational rearing of the parasitoid <i>Eretmocerus corni</i> (Hymenoptera: Aphelinidae) on host preference and adaptation<p xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" dir="auto" id="P000003">Background: The adaptive strategies of parasitoids against different hosts may evolve
under successive multigenerational rearing in alternative hosts; therefore, it is
crucial to validate the maintenance and optimization of parasitoid adaptations to
target pests during mass rearing.
<i>Eretmocerus corni</i> Haldeman (Hymenoptera: Aphelinidae) is a biological control agent for managing whitefly
pests. Here, we investigated the effects on preference and adaptation of adult
<i>E. corni</i> transferred from its original host,
<i>Trialeurodes vaporariorum</i> Westwood (Hemiptera: Aleyrodidae), to a new host,
<i>Bemisia tabaci</i> Gennadius (Hemiptera: Aleyrodidae), through successive multigenerational rearing
on
<i>B. tabaci</i> nymphs. Results: The results of the choice assays showed that for the first five
generations, the parasitoids showed a clear preference for the original rearing host
<i>T. vaporariorum</i> nymphs. However, after 15 generations of rearing on
<i>B. tabaci</i> nymphs, there was a preference for
<i>B. tabaci</i> nymphs compared to
<i>T. vaporariorum</i> nymphs. No-choice assays showed that there was no significant increase in the number
of
<i>B. tabaci</i> nymphs parasitized and total mortality in all generations, but the number of
<i>T. vaporariorum</i> nymphs parasitized and total mortality were both significantly higher in the control
than the10th and 15th generations. When
<i>E. corni</i> parasitized
<i>T. vaporariorum</i> nymphs, the developmental time of the 1st generation offspring was significantly
shorter than that of other generations. Host feeding, offspring female ratio and emergence
rate did not differ among generations or between host species. Conclusion: Our analyses
showed that successive rearing of
<i>E. corni</i> on an alternative host was able to enhance the preference for that host. However,
despite this increase in preference, the developmental suitability did not change
significantly among generations. This study provides fundamental information for understanding
the parasitism performance of
<i>E. corni</i> across different whitefly hosts over multiple generations.
</p>