John Colvin
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View article: Outbreak-driven differences in the microbiome composition and diversity of two cassava whitefly Bemisia tabaci mitotypes SSA1-SG1 and SSA1-SG2
Outbreak-driven differences in the microbiome composition and diversity of two cassava whitefly Bemisia tabaci mitotypes SSA1-SG1 and SSA1-SG2 Open
Since the 1990s, outbreaking populations of the whitefly Bemisia tabaci species complex (Sub-Saharan Africa 1 and 2) have heavily infested cassava in Uganda and eastern Africa. These superabundant SSA1 whiteflies from outbreaking areas car…
View article: Is polyphagy of a specific cryptic Bemisia tabaci species driving the high whitefly populations on cassava in eastern Africa?
Is polyphagy of a specific cryptic Bemisia tabaci species driving the high whitefly populations on cassava in eastern Africa? Open
Since the 1990s, the cryptic whitefly ( Bemisia tabaci ) has been linked to severe viral disease pandemics affecting cassava, a crucial staple crop in eastern Africa. This surge in whitefly populations has also been observed in other crops…
View article: Identifying Cassava Genotypes Resistant to the African Cassava Whitefly, Bemisia tabaci (Gennadius)
Identifying Cassava Genotypes Resistant to the African Cassava Whitefly, Bemisia tabaci (Gennadius) Open
The whitefly, Bemisia tabaci, is a major pest of cassava in Africa. Developing whitefly-resistant cassava can control both whiteflies and viral diseases. The main aim of this study was to identify cassava genotypes resistant to four B. tab…
View article: Is polyphagy of a specific cryptic Bemisia tabaci species driving the high whitefly populations on cassava in eastern Africa?
Is polyphagy of a specific cryptic Bemisia tabaci species driving the high whitefly populations on cassava in eastern Africa? Open
There have been increasingly high whitefly (Bemisia tabaci) populations and associated vector-borne viral disease pandemics since the 1990s on cassava, one of the key staple food crops in eastern Africa. The increased whitefly numbers have…
View article: Resistance to Cassava Whitefly (Bemisia tabaci) among Eastern and Southern African Elite Cassava Genotypes
Resistance to Cassava Whitefly (Bemisia tabaci) among Eastern and Southern African Elite Cassava Genotypes Open
Cassava whitefly, Bemisia tabaci, directly damages cassava leaves by feeding on phloem, causing chlorosis and abscission, leading to a yield loss of up to 50%. The pest also causes indirect damage through sooty mold formation. Most Ugandan…
View article: A comprehensive framework for the delimitation of species within the <i>Bemisia tabaci</i> cryptic complex, a global pest‐species group
A comprehensive framework for the delimitation of species within the <i>Bemisia tabaci</i> cryptic complex, a global pest‐species group Open
Identifying cryptic species poses a substantial challenge to both biologists and naturalists due to morphological similarities. Bemisia tabaci is a cryptic species complex containing more than 44 putative species; several of which are curr…
View article: Adoption determinants of improved cassava varieties and intercropping among East and Central African smallholder farmers
Adoption determinants of improved cassava varieties and intercropping among East and Central African smallholder farmers Open
A key constraint to cassava productivity in Africa is the lack of adoption of improved cassava varieties tolerant to pests and diseases. To understand the drivers of adoption behavior, we examine the simultaneous adoption of improved cassa…
View article: <i>In silico</i> prediction of candidate gene targets for the management of African cassava whitefly (<i>Bemisia tabaci</i>, SSA1-SG1), a key vector of viruses causing cassava brown streak disease
<i>In silico</i> prediction of candidate gene targets for the management of African cassava whitefly (<i>Bemisia tabaci</i>, SSA1-SG1), a key vector of viruses causing cassava brown streak disease Open
Whiteflies ( Bemisia tabaci sensu lato) have a wide host range and are globally important agricultural pests. In Sub-Saharan Africa, they vector viruses that cause two ongoing disease epidemics: cassava brown streak disease and cassava mos…
View article: Resistance to Cassava Whitefly (<em>Bemisia tabaci</em>) among Eastern and Southern Africa Elite Cassava Genotypes
Resistance to Cassava Whitefly (<em>Bemisia tabaci</em>) among Eastern and Southern Africa Elite Cassava Genotypes Open
The cassava whitefly, Bemisia tabaci, causes direct damage to cassava in the tropics by feeding on the phloem of leaves, inducing leaf chlorosis and abscission which can result in considerable yield loss of up to about 50% on susceptible v…
View article: DATASET_Role of different crop and non-crop habitats on cassava whitefly colonisation on cassava fields in Malawi.xlsx
DATASET_Role of different crop and non-crop habitats on cassava whitefly colonisation on cassava fields in Malawi.xlsx Open
Whitefly colonisation source on cassava at the beginning of the growing season was investigated by placing clean sentinel cassava in different alternative host plant habitats in Lilongwe and Nkhatabay in Malawi in 2017. The sentinel plants…
View article: Genetic diversity, distribution, and structure of Bemisia tabaci whitefly species in potential invasion and hybridization regions of East Africa
Genetic diversity, distribution, and structure of Bemisia tabaci whitefly species in potential invasion and hybridization regions of East Africa Open
Outbreaks of whitefly, Bemisia tabaci species in East and Central Africa, have become increasingly prevalent during the previous 25 years and are responsible for driving the spread of plant-virus diseases, such as cassava mosaic disease an…
View article: Insecticide Use by Small-Scale Ugandan Cassava Growers: An Economic Analysis
Insecticide Use by Small-Scale Ugandan Cassava Growers: An Economic Analysis Open
Cassava is the second most important source of calories in Sub-Saharan Africa. It is subject to economically important yield losses from viral diseases, including cassava brown streak disease and cassava mosaic disease. These diseases are …
View article: Distribution of Bemisia tabaci in different agro-ecological regions in Uganda and the threat of vector-borne pandemics into new cassava growing areas
Distribution of Bemisia tabaci in different agro-ecological regions in Uganda and the threat of vector-borne pandemics into new cassava growing areas Open
Previous studies in sub-Saharan Africa have showed the spread of cassava mosaic disease (CMD) and cassava brown streak disease (CBSD) pandemics into different cassava growing regions by high Bemisia tabaci populations. Studies did indicate…
View article: Additional File 6: Ensembl annotation of B. argentifolii and B. tabaci s.s genomes.
Additional File 6: Ensembl annotation of B. argentifolii and B. tabaci s.s genomes. Open
Genomic reannotation of the published B. argentifolii (doi.org/10.1186/s12915-016-0321-y) and B. tabaci s.s (doi.org/10.1093/gigascience/gix018) genomes using the Ensembl genebuild annotation pipeline; see here: https://www.ensembl.org/inf…
View article: Additional file 7: Endosymbiont assemblies and annotations
Additional file 7: Endosymbiont assemblies and annotations Open
Candidatus Portiera aleyrodidarum (six populations of Bemisia tabaci s.l.), complete annotations and chromosome sequences. Including custom script to help with Flye assembler output parsing.
View article: Additional File 3: Comparative genomic analysis of Bemisia tabaci s.l. and other arthropods
Additional File 3: Comparative genomic analysis of Bemisia tabaci s.l. and other arthropods Open
Output from Orthofinder of whole genome comparative analysis of eight populations of Bemisa tabaci s.l. analysed with non-whitefly species within the order Hemiptera, Hexapoda and non-Hexapoda arthropod outgroups.
View article: Spatio-temporal changes in endosymbiont diversity and composition in the African cassava whitefly, Bemisia tabaci SSA1
Spatio-temporal changes in endosymbiont diversity and composition in the African cassava whitefly, Bemisia tabaci SSA1 Open
Sap-sucking insects, including whiteflies, are amongst the most devastating and widely distributed organisms on the planet. They are often highly invasive and endosymbiont communities within these insects help them adapt to new or changing…
View article: Bean Leaf Beetle (Ootheca spp.) (Coleoptera: Chrysomelidae) Management via Planting Timing and Insecticides
Bean Leaf Beetle (Ootheca spp.) (Coleoptera: Chrysomelidae) Management via Planting Timing and Insecticides Open
Bean leaf beetles (Ootheca spp.) (Coleoptera: Chrysomelidae) are one of Africa’s most important pests of the common bean (Phaseolus vulgaris L.). Roots, leaves, floral parts, and young pods are all attacked, leading to a considerable loss …
View article: Impacts of cassava whitefly pests on the productivity of East and Central African smallholder farmers
Impacts of cassava whitefly pests on the productivity of East and Central African smallholder farmers Open
A key constraint to smallholder cassava production systems in Africa is the cassava whitefly pest species. These pests are a group of several cryptic species within Bemisia tabaci that cause direct damage to cassava and vector viruses that…
View article: A high‐throughput amplicon sequencing approach for population‐wide species diversity and composition survey
A high‐throughput amplicon sequencing approach for population‐wide species diversity and composition survey Open
Management of agricultural pests requires an understanding of pest species diversity, their interactions with beneficial insects and spatial‐temporal patterns of pest abundance. Invasive and agriculturally important insect pests can build …
View article: Microbiome diversity and reproductive incompatibility induced by the prevalent endosymbiont <i>Arsenophonus</i> in two species of African cassava <i>Bemisia tabaci</i> whiteflies
Microbiome diversity and reproductive incompatibility induced by the prevalent endosymbiont <i>Arsenophonus</i> in two species of African cassava <i>Bemisia tabaci</i> whiteflies Open
A minimum of 13 diverse whitefly species belonging to the Bemisia tabaci ( B. tabaci ) species complex are known to infest cassava crops in sub‐Saharan Africa (SSA), designated as SSA1‐13. Of these, the SSA1 and SSA2 are the predominant sp…
View article: Distribution and Relative Abundance of Bean Leaf Beetles (Ootheca spp.) (Insecta: Coleoptera: Chrysomelidae) in Uganda
Distribution and Relative Abundance of Bean Leaf Beetles (Ootheca spp.) (Insecta: Coleoptera: Chrysomelidae) in Uganda Open
Bean leaf beetles (Ootheca spp.) (Insecta: Coleoptera: Chrysomelidae) are one of Africa’s most destructive pests of common bean and other leguminous crops. The beetles are widely distributed in Africa where they are estimated to cause annu…
View article: Influence of Cassava Morphological Traits and Environmental Conditions on Field Populations of Bemisia tabaci
Influence of Cassava Morphological Traits and Environmental Conditions on Field Populations of Bemisia tabaci Open
High populations of species in the whitefly complex Bemisia tabaci Gennadius (Hemiptera: Aleyrodidae) were reported to cause severe damage to cassava in East and Central Africa. However, reasons for B. tabaci population increases are not w…
View article: Mortality factors acting on field populations of Bemisia tabaci (Hemiptera: Aleyrodidae) SSA1 on cassava in Uganda
Mortality factors acting on field populations of Bemisia tabaci (Hemiptera: Aleyrodidae) SSA1 on cassava in Uganda Open
Natural death is a key determinant of a species population dynamics. Thus, a clear understanding of natural mortality factors aids the development of appropriate management strategies for insect pests. Cohort-based life tables were constru…