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What has changed in the outbreaking populations of the severe crop pest whitefly species in cassava in two decades?

What has changed in the outbreaking populations of the severe crop pest whitefly species in cassava in two decades?

Hally, Hadija M., Hamss, Hajar El, Simiand, Christophe, Maruthi, M. N. ORCID: 0000-0002-8060-866X, Colvin, John, Omongo, Christopher A. and Delatte, Helene (2019) What has changed in the outbreaking populations of the severe crop pest whitefly species in cassava in two decades? Scientific Reports, 9:14796. ISSN 2045-2322 (Online) (doi:https://doi.org/10.1038/s41598-019-50259-0)

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Abstract

High populations of African cassava whitefly (Bemisia tabaci) have been associated with epidemics of two viral diseases in Eastern Africa. We investigated population dynamics and genetic patterns by comparing whiteflies collected on cassava in 1997, during the first whitefly upsurges in Uganda, with collections made in 2017 from the same locations. Nuclear markers and mtCOI barcoding sequences were used on 662 samples. The composition of the SSA1 population changed significantly over the 20-year period with the SSA1-SG2 percentage increasing from 0.9 to 48.6%. SSA1-SG1 and SSA1-SG2 clearly interbreed, confirming that they are a single biological species called SSA1. The whitefly species composition changed: in 1997, SSA1, SSA2 and B. afer were present; in 2017, no SSA2 was found. These data and those of other publications do not support the ‘invader’ hypothesis. Our evidence shows that no new species or new population were found in 20 years, instead, the distribution of already present genetic clusters composing SSA1 species have changed over time and that this may be in response to several factors including the introduction of new cassava varieties or climate changes. The practical implications are that cassava genotypes possessing both whitefly and disease resistances are needed urgently.

Item Type: Article
Uncontrolled Keywords: Africa, cassava, whitefly, invasions, molecular markers
Subjects: S Agriculture > S Agriculture (General)
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Natural Resources Institute
Faculty of Engineering & Science > Natural Resources Institute > Agriculture, Health & Environment Department
Faculty of Engineering & Science > Natural Resources Institute > Plant Health Research Group
Last Modified: 31 Oct 2019 10:46
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
URI: http://gala.gre.ac.uk/id/eprint/25198

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