Publications in VIVO

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Legg, James Plant Health Specialist, IITA

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selected publications

article
- Expansion of the cassava brown streak disease epidemic in eastern Democratic Republic of Congo.. Plant Disease. 2020
- Genetic Diversity of Mitochondrial DNA of Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) Associated with Cassava and the Occurrence of Cassava Mosaic Disease in Zambia. Insects. 11:761. 2020
- Global cropland connectivity: A risk factor for invasion and saturation by emerging pathogens and pests. BioScience. 70:744-758. 2020
- Life history and temperature-dependence of cassava-colonising populations of Bemisia tabaci. Journal of Pest Science. 93:1225-1241. 2020
- Genotype by environment cultivar evaluation for cassava brown streak disease resistance in Tanzania. Virus Research. 286:198017. 2020
- KASP Genotyping as a Molecular Tool for Diagnosis of Cassava-Colonizing Bemisia tabaci.. Insects. 11:305. 2020
- Evaluating the accuracy of a smartphone-based artificial intelligence system, PlantVillage Nuru, in diagnosing of the viral diseases of cassava. bioRxiv. 2020
- Genetic Diversity of Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) Colonizing Sweet Potato and Cassava in South Sudan.. Insects. 11:58. 2020
- Accuracy of a Smartphone-Based Object Detection Model, PlantVillage Nuru, in Identifying the Foliar Symptoms of the Viral Diseases of Cassava-CMD and CBSD. Frontiers in Plant Science. 11. 2020
- Expansion of the cassava brown streak pandemic in Uganda revealed by annual field survey data for 2004 to 2017.. Scientific Data. 6:1-8. 2019
- Assessing the Degeneration of Cassava Under High-Virus Inoculum Conditions in Coastal Tanzania.. Plant Disease. 103:2652-2664. 2019
- A global surveillance system for crop diseases. Science. 364:1237-1239. 2019
- Correction to: Potential impact of climate change on whiteflies and implications for the spread of vectored viruses. Journal of Pest Science. 92:1309-1311. 2019
- Genome of the African cassava whitefly Bemisia tabaci and distribution and genetic diversity of cassava-colonizing whiteflies in Africa.. Insect Biochemistry and Molecular Biology. 110:112-120. 2019
- Potential impact of climate change on whiteflies and implications for the spread of vectored viruses. Journal of Pest Science. 92:381-392. 2019
- Pesticide Use Practices in Root, Tuber, and Banana Crops by Smallholder Farmers in Rwanda and Burundi.. International Journal of Environmental Research and Public Health. 16:400. 2019
- Impact of Host Plant Species and Whitefly Species on Feeding Behavior of Bemisia tabaci.. Frontiers in Plant Science. 10:1. 2019
- A method for generating virus-free cassava plants to combat viral disease epidemics in Africa. Physiological and Molecular Plant Pathology. 105:77-87. 2019
- Farmer Reported Pest and Disease Impacts on Root, Tuber, and Banana Crops and Livelihoods in Rwanda and Burundi. Sustainability. 11. 2019
- First Report of Mixed Infection of Cassava Brown Streak Virus and Ugandan Cassava Brown Streak Virus on Cassava in North-eastern Democratic Republic of Congo. Plant Disease. 103:166-166. 2019
- The Role of Women in Production and Management of RTB Crops in Rwanda and Burundi: Do Men Decide, and Women Work?. Sustainability. 11. 2019
- World Management of Geminiviruses.. Annual Review of Phytopathology. 56:637-677. 2018
- Two New Invasive Whiteflies (Hemiptera: Aleyrodidae) to Tanzania. African Entomology. 26:259-264. 2018
- Exchanging and managing in-vitro elite germplasm to combat Cassava Brown Streak Disease (CBSD) and Cassava Mosaic Disease (CMD) in Eastern and Southern Africa. Food Security. 10:351-368. 2018
- Unravelling the Genetic Diversity among Cassava Bemisia tabaci Whiteflies Using NextRAD Sequencing.. Genome Biology and Evolution. 9:2958-2973. 2017
- Deep Learning for Image-Based Cassava Disease Detection.. Frontiers in Plant Science. 8:1852-1852. 2017
- Cassava mosaic disease: incidence and yield performance of cassava cultivars in Zambia.. Journal of Plant Pathology. 99:681-689. 2017
- Community phytosanitation to manage cassava brown streak disease.. Virus Research. 241:236-253. 2017
- The role of the whitefly, Bemisia tabaci (Gennadius), and farmer practices in the spread of cassava brown streak ipomoviruses. Journal of Phytopathology. 165:707-717. 2017
- Genetic diversity of Bemisia tabaci species colonizing cassava in Central African Republic characterized by analysis of cytochrome c oxidase subunit I. PLOS ONE. 12. 2017
- Absolute quantification of cassava brown streak virus mRNA by real-time qPCR.. Journal of Virological Methods. 245:5-13. 2017
- Interactions Between Cassava Mosaic Geminiviruses and Their Vector, Bemisia tabaci (Hemiptera: Aleyrodidae).. Journal of Economic Entomology. 110:884-892. 2017
- Global cropland connectivity: A risk factor for invasion and saturation by emerging pathogens and pests. bioRxiv. 106542. 2017
- A risk assessment framework for seed degeneration: Informing an integrated seed health strategy for vegetatively-propagated crops. Phytopathology. 107:105361-1135. 2017
- Integrated pest management of root and tuber crops in the tropics 2017
- Survey, molecular detection and characterization of geminiviruses associated with cassava mosaic disease in Zambia. Plant Disease. 100:1379-1387. 2016
- Analysis of Interactions Between Cassava Brown Streak Disease Symptom Types Facilitates the Determination of Varietal Responses and Yield Losses.. Plant Disease. 100:1388-1396. 2016
- Abundance, diversity and geographic distribution of cassava mosaic disease pandemic-associated Bemisia tabaci in Tanzania. Journal of Applied Entomology. 139:627-637. 2015
- First report of East African cassava mosaic Malawi virus in plants affected by cassava mosaic disease in Zambia. Plant Disease. 99:1290-1290. 2015
- Diversity, Distribution and Effects on Cassava Cultivars of Cassava Brown Streak Viruses in Malawi. Journal of Phytopathology. 163:433-443. 2015
- Cassava brown streak disease: a threat to food security in Africa.. Journal of General Virology. 96:956-968. 2015
- Diversity of symbiotic bacteria associated with Bemisia tabaci (Homoptera: Aleyrodidae) in cassava mosaic disease pandemic areas of Tanzania. Annals of Applied Biology. 166:297-310. 2015
- Survey on whiteflies and their parasitoids in cassava mosaic pandemic areas of Tanzania using morphological and molecular techniques.. Pest Management Science. 71:383-394. 2015
- Biology and management of Bemisia whitefly vectors of cassava virus pandemics in Africa.. Pest Management Science. 70:1446-1453. 2014
- First Record of Aleuroclava psidii (Singh) and Aleurotrachelus tuberculatus Singh (Hemiptera: Aleyrodidae) in East Africa. African Entomology. 22:437-440. 2014
- Spatio-temporal patterns of genetic change amongst populations of cassava Bemisia tabaci whiteflies driving virus pandemics in East and Central Africa. Virus Research. 186:61-75. 2014
- Management of RTB-critical pests and diseases under changing climates, through risk assessment, surveillance and modeling, 29-31 January, 2014, Kabale, Uganda 2014
- Management of whitefly-transmitted viruses in open-field production systems.. Advances in Virus Research. 90:147-206. 2014
- Epidemiological assessment of cassava mosaic disease in Central African Republic reveals the importance of mixed viral infection and poor health of plant cuttings. Crop Protection. 44:6-12. 2013
- Assesment of pesticide use during vegetable production in costal areas of Tanzania. Proceedings of the 11th African Crop Science Society Conference, 14 - 17 October 2013, Entebbe Uganda 2013
- Assessment of tomato and pepper pests and diseases in coastal areas of Tanzania. Proceedings of the 11th African Crop Science Society Conference, 14 - 17 October 2013, Entebbe Uganda 2013
- Estimating the effectiveness of management strategies to reduce seed degeneration in vegetatively-propagated crops: A theoretical framework. Phytopathology. 103:145-145. 2013
- Comparison of disease patterns assessed by three independent surveys of cassava mosaic virus disease in Rwanda and Burundi. Plant Pathology. 61:399-412. 2012
- Les facteurs determinant l'abondance du vecteur mouche blanche (Bemisia tabaci, Homoptera : Aleyrodidae) et les types des virus distribues sur le manioc en R.D. Congo 2012
- Multiplex RT-PCR assays for the simultaneous detection of both RNA and DNA viruses infecting cassava and the common occurrence of mixed infections by two cassava brown streak viruses in East Africa.. Journal of Virological Methods. 179:176-184. 2012
- Comparing the regional epidemiology of the cassava mosaic and cassava brown streak virus pandemics in Africa. Virus Research. 159:161-170. 2011
- Occurrence and distribution of cassava pests and diseases in Rwanda. Agriculture, Ecosystems & Environment. 140:492-497. 2011
- Developing clean seed systems for cassava in East and Central Africa 2011
- Meeting the challenges of Cassava Brown Streak Disease (CBSD) in Malawi 2011
- Optimization of diagnostic RT-PCR protocols and sampling procedures for the reliable and cost-effective detection of Cassava brown streak virus.. Journal of Virological Methods. 163:353-359. 2010
- Optimization of diagnostic RT-PCR protocols and sampling procedures for the reliable and cost-effective detection of Cassava brown streak virus 2010
- Epidemiology of a Whitefly-Transmitted Cassava Mosaic Geminivirus Pandemic in Africa 2009
- GLCI Disease Objective: progress and prospective 2009
- Rapid single-step multiplex reverse transcription-PCR for the simultaneous detection of cassava brown streak virus, African cassava mosaic virus and East African cassava mosaic virus in cassava 2009
- Parasitism of Bemisia tabaci (Homoptera: Aleyrodidae) by Eretmocerus mundus (Hymenoptera: Aphelinidae) on cassava. International Journal of Tropical Insect Science. 28:158-167. 2008
- African cassava mosaic disease 2008
- Great lakes cassava initiative (GLCI) 2008
- Evaluation of Serangium n. sp. (Col., Coccinellidae), a predator of Bemisia tabaci (Hom., Aleyrodidae) on cassava. Journal of Applied Entomology. 131:76-80. 2007
- Accelerated multiplication and distribution of improved healthy planting materials of Cassava varieties in Western Kenya 2007
- Incidence and distribution of cassava diseases and pests in the Democratic Republic of Congo 2007
- Incidence and severity of cassava mosaic disease in the Republic of Congo 2007
- Monitoring and diagnostic survey of cassava mosaic virus disease (CMD) in Burundi 2007
- Monitoring and diagnostic survey of cassava mosaic virus disease (CMD) in Eastern Democratic Republic of Congo (Part 2) 2007
- Southern Sudan, Equatoria region, cassava baseline survey technical report 2007
- Life-table analysis of mortality factors affecting populations of Bemisia tabaci on cassava in Uganda. Entomologia Experimentalis Et Applicata. 122:37-44. 2006
- Population dynamics of Bemisia tabaci (Homoptera: Aleyrodidae) parasitoids on cassava mosaic disease–resistant and susceptible varieties. Biocontrol Science and Technology. 16:205-214. 2006
- Current characteristics of cassava mosaic disease in postepidemic areas increase the range of possible management options. Annals of Applied Biology. 149:137-144. 2006
- Colonization of non-cassava plant species by cassava whiteflies (Bemisia tabaci) in Uganda. Entomologia Experimentalis Et Applicata. 119:145-153. 2006
- Identification of a defective molecule derived from DNA‐A of the bipartite begomovirus of East African cassava mosaic virus. Plant Pathology. 55:2-10. 2006
- Cassava mosaic virus disease in East and Central Africa: epidemiology and management of a regional pandemic.. Advances in Virus Research. 67:355-418. 2006
- Detection and identification of begomoviruses from landraces of okra (Abelmoschus esculentus) in Cameroon 2006
- Identification of a defective molecule derived from DNA-A of the bipartite begomovirus of East African Cassava Mosaic Virus 2006
- Population dynamics of Bemisia tabaci (Homoptera: Aleyrodidae) parasitoids on cassava mosaic disease-resistant and susceptible varieties 2006
- Sustainable integrated management of whiteflies as vectors of viruses of cassava and sweetpotato: situation analysis of three farmers' groups in south eastern Nigeria 2006
- The African Cassava Mosaic Disease pandemic and its mitigation 2006
- Genetic diversity of Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) populations and presence of the B biotype and a non‐B biotype that can induce silverleaf symptoms in squash, in Uganda. Annals of Applied Biology. 147:253-265. 2005
- Application of FTA technology for sampling, recovery and molecular characterization of viral pathogens and virus-derived transgenes from plant tissues.. Virology Journal. 2:45-45. 2005
- Molecular biodiversity of cassava begomoviruses in Tanzania: evolution of cassava geminiviruses in Africa and evidence for East Africa being a center of diversity of cassava geminiviruses. Virology Journal. 2:21-21. 2005
- Cassava mosaic geminiviruses associated with cassava mosaic disease in Rwanda. International Journal of Pest Management. 51:17-23. 2005
- Occurrence and activity of Bemisia tabaci parasitoids on cassava in different agro-ecologies in Uganda. Biocontrol. 50:87-95. 2005
- Application of FTA technology for sampling, recovery and molecular characterization of viral pathogens and virus-derived transgenes from plant tissues 2005
- Management of the Cassava Mosaic Disease Pandemic in East Africa 2005
- Occurrence and activity of Bemisia tabaci parasitoids in different agroecologies in Uganda 2005
- Special topics on pest and disease management: Progress of cassava mosaic disease in Ugandan cassava varieties and in varietal mixtures 2005
- Special topics on pest and disease management: management of the cassava mosaic disease pandemic in East Africa 2005
- Whiteflies as vectors of plant viruses in cassava and sweet potato in Africa: Introduction 2005
- Whiteflies as vectors of plant viruses in cassava and sweetpotato in Africa: The diversity of cassava mosaic begomoviruses in Africa 2005
- Whiteflies as vectors of plant viruses in cassava and sweetpotato in Africa: Uganda 2005
- The effect of cassava mosaic geminiviruses on symptom severity, growth and root yield of a cassava mosaic virus disease‐susceptible cultivar in Uganda. Annals of Applied Biology. 145:331-337. 2004
- Cassava mosaic geminiviruses in Africa.. Plant Molecular Biology. 56:585-599. 2004
- The cassava mosaic geminiviruses occurring in Uganda following the 1990s epidemic of severe cassava mosaic disease. Annals of Applied Biology. 145:113-121. 2004
- First evidence for the spread of East African cassava mosaic virus– Uganda (EACMV‐UG) and the pandemic of severe cassava mosaic disease to Burundi. Plant Pathology. 53:231-231. 2004
- First report of cassava mosaic disease and cassava mosaic geminiviruses in Gabon. Plant Pathology. 53:232-232. 2004
- Methods of surveying the incidence and severity of cassava mosaic disease and whitefly vector populations on cassava in Africa: a review. Virus Research. 100:129-142. 2004
- Field studies of cross protection with cassava Mosaic Geminiviruses in Uganda 2004
- Viruses associated with cassava mosaic disease in Senegal and Guinea Conakry 2004
- Biological control of whiteflies in sub-Saharan Africa 2003
- Cassava mosaic disease pandemic in sub-Saharan Africa: an unsolved problem with a solution 2003
- Cassava: from poor farmer's crop to pacesetter of African rural development 2003
- Potential for biological control of the whitefly, Bemisia tabaci, vector of cassava mosaic geminiviruses using parasitoids in Uganda 2003
- Virus diseases of root crops in Africa: Abstracts 2003
- A distinct Bemisia tabaci (Gennadius) (Hemiptera: Sternorrhyncha: Aleyrodidae) genotype cluster is associated with the epidemic of severe cassava mosaic virus disease in Uganda.. Molecular Ecology. 11:1219-1229. 2002
- Interactions between cassava mosaic geminiviruses and the African pandemic of cassava mosaic disease 2002
- Plants infected with mild strains of cassava mosaic geminiviruses (CMGs) outperform initially healthy plants under high CMG inoculum pressure conditions in Uganda 2002
- Population dynamics of cassava whitefly parasitoids on cassava mosaic disease resistant and susceptible cultivars 2002
- Disease spread patterns of Banana streak virus in farmers, fields in Uganda. Annals of Applied Biology. 139:31-36. 2001
- Vector transmission of Banana streak virus in the screenhouse in Uganda. Annals of Applied Biology. 139:37-43. 2001
- Cassava mosaic virus disease in East Africa: a dynamic disease in a changing environment.. Virus Research. 71:135-149. 2000
- An overview: strengthening IPM for the management of cassava mosaic virus disease in East Africa 2000
- Status of sweetpotato virus disease in East Africa-a 1999 update on incidence 2000
- Use of meristem culture to produce banana-streak virus-free plantlets 2000
- An overview of the incidence of cassava mosaic disease in East Africa, 1998 update 1999
- Emergence, spread and strategies for controlling the pandemic of cassava mosaic virus disease in east and central Africa 1999
- Fighting cassava mosaic pandemic: networking critical 1999
- Geminiviruses and whiteflies across Africa 1999
- The pandemic of cassava mosaic virus disease in East Africa: control strategies and regional partnerships 1999
- Changes in the incidence of African cassava mosaic geminivirus and the abundance of its whitefly vector along south-north transects in Uganda 1998
- Cassava germplasm enhancement for food security and industrial utilization in East and Southern Africa 1997
- Diagnostic survey of African cassava mosaic viruses in Tanzania, Malawi and Zambia 1997
- Opportunities for commercializing cassava in East and Southern Africa 1997
- Host-associated strains within Ugandan populations of the whitefly Bemisia tabaci (Genn.), (Hom., Aleyrodidae).. Journal of Applied Entomology. 120:523-527. 1996
- Bemisia tabaci: the whitefly vector of cassava mosaic geminiviruses in Africa: an ecological perspective 1994
document
editorial article
- A global alliance declaring war on cassava viruses in Africa. Food Security. 6:231-248. 2014
- First report of the occurrence of East African cassava mosaic virus -Uganda (EACMV-UG) in Angola. Plant Pathology. 58:402-402. 2009
- Occurrence of the Uganda variant of East African cassava mosaic virus (EACMV‐Ug) in western Democratic Republic of Congo and the Congo Republic defines the westernmost extent of the CMD pandemic in East/Central Africa. Plant Pathology. 51:385-385. 2002
review
- Cassava virus diseases: biology, epidemiology, and management.. ADVANCES IN VIRUS RESEARCH, VOL 66. 85-142. 2015