Ecology and Evolution (2012) 2, 2749-2762

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Habibu Mugerwa, Marie E.C. Rey, Titus Alicai, Elijah Ateka, Hellen Atuncha, Joseph Ndunguru and Peter Sseruwagi (2012)
Genetic diversity and geographic distribution of Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) genotypes associated with cassava in East Africa
Ecology and Evolution 2 (11), 2749-2762
Abstract: The genetic variability of whitefly (Bemisia tabaci) species, the vectors of cassava mosaic begomoviruses (CMBs) in cassava growing areas of Kenya, Tanzania, and Uganda, was investigated through comparison of partial sequences of the mitochondria cytochrome oxidase I (mtCOI) DNA in 2010/11. Two distinct species were obtained including sub-Saharan Africa 1 (SSA1), comprising of two sub-clades (I and II), and a South West Indian Ocean Islands (SWIO) species. Among the SSA1, sub-clade I sequences shared a similarity of 97.8-99.7% with the published Uganda 1 genotypes, and diverged by 0.3-2.2%. A pairwise comparison of SSA1 sub-clade II sequences revealed a similarity of 97.2-99.5% with reference southern Africa genotypes, and diverged by 0.5-2.8%. The SSA1 sub-clade I whiteflies were widely distributed in East Africa (EA). In comparison, the SSA1 sub-clade II whiteflies were detected for the first time in the EA region, and occurred predominantly in the coast regions of Kenya, southern and coast Tanzania. They occurred in low abundance in the Lake Victoria Basin of Tanzania and were widespread in all four regions in Uganda. The SWIO species had a sequence similarity of 97.2-97.7% with the published Reunion sequence and diverged by 2.3-2.8%. The SWIO whiteflies occurred in coast Kenya only. The sub-Saharan Africa 2 whitefly species (Ug2) that was associated with the severe CMD pandemic in Uganda was not detected in our study.
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Database assignments for author(s): Peter Sseruwagi, Titus Alicai, Marie Emma Christine Rey

Research topic(s) for pests/diseases/weeds:
surveys/sampling/distribution
molecular biology - genes


Pest and/or beneficial records:

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


Bemisia tabaci biotype Sub Saharan Africa 1 Cassava (Manihot esculenta) Kenya
Bemisia tabaci biotype Sub Saharan Africa 1 Cassava (Manihot esculenta) Tanzania
Bemisia tabaci biotype Sub Saharan Africa 1 Cassava (Manihot esculenta) Uganda