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The diversity of aphid parasitoids in East Africa and implications for biological control

The diversity of aphid parasitoids in East Africa and implications for biological control

Woolley, Victoria C ORCID: 0000-0002-9439-6856, Tembo, Yolice LB ORCID: 0000-0002-2945-9128, Ndakidemi, Baltazar ORCID: 0000-0001-9539-3764, Obanyi, Janet N, Arnold, Sarah E.J. ORCID: 0000-0001-7345-0529, Belmain, Steven R. ORCID: 0000-0002-5590-7545, Ndakidemi, Patrick A, Ogendo, Joshua O and Stevenson, Philip C ORCID: 0000-0002-0736-3619 (2021) The diversity of aphid parasitoids in East Africa and implications for biological control. Pest Management Science. ISSN 1526-498X (Print), 1526-4998 (Online) (doi:https://doi.org/10.1002/ps.6723)

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Abstract

BACKGROUND
Hymenopteran parasitoids provide key natural pest regulation services and are reared commercially as biological control agents. Therefore, understanding parasitoid community composition in natural populations is important to enable better management for optimized natural pest regulation. We carried out a field study to understand the parasitoid community associated with Aphis fabae on East African smallholder farms. Either common bean (Phaseolus vulgaris) or lablab (Lablab purpureus) sentinel plants were infested with Aphis fabae and deployed in 96 fields across Kenya, Tanzania, and Malawi.
RESULTS
A total of 463 parasitoids emerged from sentinel plants of which 424 were identified by mitochondrial cytochrome oxidase I (COI) barcoding. Aphidius colemani was abundant in Kenya, Tanzania and Malawi, while Lysiphlebus testaceipes was only present in Malawi. The identity of Aphidius colemani specimens were confirmed by sequencing LWRh and 16S genes and was selected for further genetic and population analyses. A total of 12 Aphidius colemani haplotypes were identified. Of these, nine were from our East African specimens and three from the Barcode of Life Database (BOLD).
CONCLUSION
Aphidius colemani and Lysiphlebus testaceipes are potential targets for conservation biological control in tropical smallholder agro-ecosystems. We hypothesize that high genetic diversity in East African populations of Aphidius colemani suggests that this species originated in East Africa and has spread globally due to its use as a biological control agent. These East African populations could have potential for use as strains in commercial biological control or to improve existing Aphidius colemani strains by selective breeding.

Item Type: Article
Additional Information: Early View: Online Version of Record before inclusion in an issue.
Uncontrolled Keywords: parasitoid; Aphidius colemani; biological control; Aphis fabae; DNA barcoding
Subjects: Q Science > QH Natural history > QH301 Biology
S Agriculture > S Agriculture (General)
Faculty / School / Research Centre / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Natural Resources Institute
Faculty of Engineering & Science > Natural Resources Institute > Agriculture, Health & Environment Department
Related URLs:
Last Modified: 30 Nov 2021 13:39
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
Selected for REF2021: None
URI: http://gala.gre.ac.uk/id/eprint/34486

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