Pest Management Science (2022) 78, 1109-1116

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Victoria C. Woolley, Yolice L.B. Tembo, Baltazar Ndakidemi, Janet N. Obanyi, Sarah E.J. Arnold, Steven R. Belmain, Patrick A. Ndakidemi, Joshua O. Ogendo and Philip C. Stevenson (2022)
The diversity of aphid parasitoids in East Africa and implications for biological control
Pest Management Science 78 (3), 1109-1116
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.
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).
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.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Steven R. Belmain, Joshua O. Ogendo, Philip C. Stevenson

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Aphis fabae Beans (Phaseolus) Kenya
Aphis fabae Beans (Phaseolus) Tanzania
Aphis fabae Beans (Phaseolus) Malawi
Aphis fabae Hyacinth bean (Lablab purpureus) Kenya
Aphis fabae Hyacinth bean (Lablab purpureus) Tanzania
Aphis fabae Hyacinth bean (Lablab purpureus) Malawi
Lysiphlebus testaceipes (parasitoid) Aphis fabae Beans (Phaseolus) Malawi
Aphidius colemani (parasitoid) Aphis fabae Beans (Phaseolus) Kenya
Aphidius colemani (parasitoid) Aphis fabae Beans (Phaseolus) Tanzania
Aphidius colemani (parasitoid) Aphis fabae Beans (Phaseolus) Malawi
Diaeretiella rapae (parasitoid) Aphis fabae Tanzania