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Dissertations / Theses on the topic 'Cassava mosaic disease (CMD)'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Otim-Nape, George William. "Epidemiology of the African cassava mosaic geminivirus disease (ACMD) in Uganda." Thesis, University of Reading, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357982.

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2

Maruthi, M. N. "Bemisia tabaci and geminivirus variability in relation to cassava mosaic disease." Thesis, University of Greenwich, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369144.

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3

Ndunguru, Joseph. "Molecular characterization of cassava mosaic geminiviruses in Tanzania." Thesis, University of Pretoria, 2005. http://hdl.handle.net/2263/30648.

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Cassava (Manihot esculenta Crantz) is a basic staple food crop in Tanzania. Cassava mosaic disease (CMD) caused by cassava mosaic geminiviruses (CMGs) constitutes a major limiting factor to cassava production in the country. This study was undertaken to characterize the CMGs occurring in Tanzania using molecular techniques and to map their geographical distribution to generate information on which the formulation of control measures can be based. Using Polymerase Chain Reaction (PCR) and Restriction Fragment Length Polymorphism (RFLP) for analysis of CMGs DNA-A genomes, different CMGs were fou

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4

Tajebe, Lensa Sefera. "A study of the super-abundant Bemisia tabaci (Gennadius) species complex (Hemiptera: Aleyrodidae) in cassava mosaic disease pandemic areas in Tanzania." Doctoral thesis, Università di Catania, 2015. http://hdl.handle.net/10761/4065.

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Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) is a cryptic species complex comprising morphologically indistinguishable but genetically variable populations. It is the vector of cassava mosaic geminiviruses (CMGs) causing cassava mosaic (CMD) disease to cassava (Manihot esculenta Crantz). After the outbreak and spread of a severe CMD from Uganda to several East and Central African countries, the production of cassava has been impaired. The severe CMD pandemic is mainly characterized by high disease severity and super-abundant populations of B. tabaci. This research sought to study the su

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5

Cossa, Nurbibi Saifodine. "Epidemiology of cassava mosaic disease in Mozambique." Thesis, 2011. http://hdl.handle.net/10539/10281.

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Cassava (Manihot esculenta Crantz) belongs to the family Euphorbiaceae. The crop was introduced to África, including Mozambique, in the 17th century by Portuguese traders. Cassava is one of the most important crops in Africa. It is widely grown in many countries of sub-Saharan Africa and Madagascar, and plays a major role in food security and poverty alleviation. In Mozambique, cassava is the second most important root crop and used exclusively as human consumption: it is estimated that 70% of the total cassava production is utilized as human food. Cassava is chiefly vegetatively propagated f

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6

Mvududu, DonTafadzwa Kudzanai. "Screening of cassava improved germplasm for potential resistance against cassava mosaic disease." Thesis, 2017. http://hdl.handle.net/10539/22733.

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A dissertation submitted to the Faculty of Science, University of the Witwatersrand, in fulfillment of the requirements for the degree of Master of Science in the School of Molecular and Cell Biology. Johannesburg 2017<br>With growing populations and climate change associated drought predicted for the future, cassava can provide one solution for food security and a source of starch for industrial use and biofuels in South Africa, and other countries in the SADC region. One of the severe constraints on cassava production is cassava mosaic disease (CMD) caused by cassava infecting begomovirus

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7

Chikoti, Patrick Chiza. "Development of cassava (Manihot esculenta Crantz) cultivars for resistance to cassava mosaic disease in Zambia." Thesis, 2011. http://hdl.handle.net/10413/8402.

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Despite the increasing number of farmers growing cassava in Zambia, yield per hectare has remained low at 5.8 t ha-1. The major constraints contributing to low yields are pests and diseases of which cassava mosaic disease (CMD) caused by East Africa cassava mosaic virus (EACMV), Africa cassava mosaic virus (ACMV) and South Africa mosaic virus (SACMV) is the most important. Breeding of cassava is restricted by limited information on viruses and associated satellites, and farmer preferences. Most of the farmers cannot manage to institute control strategies that require buying of chemicals. The m

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8

Moralo, Maabo. "Evaluation of transgenic cassava expressing mismatch and non-mismatch hpRNA constructs derived from African cassava mosaic virus and South African cassava mosaic virus open reading frames." Thesis, 2015. http://hdl.handle.net/10539/19289.

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A thesis submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Doctor of Philosophy in the School of Molecular and Cell Biology. Johannesburg, 2015.<br>With rising global food prices, growing populations, climate change and future demand for tuber crops for feed and potential energy source, cassava is well positioned to meet the needs of many countries in the SADC region, including South Africa. However a major constraint to cassava cultivation is cassava infecting begomoviruses (CBVs), including African cassava

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9

Rogans, Sarah Jane. "The role of small RNAs in susceptibility and tolerance to cassava mosaic disease." Thesis, 2016. http://hdl.handle.net/10539/21701.

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A dissertation presented by Sarah Jane Rogans to The Faculty of Science, University of the Witwatersrand, Johannesburg in fulfilment of the requirements for the degree of Doctor of Philosophy in the School of Molecular and Cell Biology. 2016<br>Cassava (Manihot esculenta, Crantz) is considered to be an important food security crop consumed by over a billion peoples globally, many who subsist on it. Cassava mosaic disease (CMD) is one of the main biotic and economically important constraints to cassava cultivation in sub-Saharan Africa. Geminiviruses are the casual agents of CMD and cause dise

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10

Rajabu, Cyprian Aloyce. "Development and evaluation of efficient diagnostic tools for Cassava mosaic and Cassava brown streak diseases." Thesis, 2014.

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Cassava (Manihot esculenta Crantz) is affected by two major viral diseases, namely Cassava brown streak disease (CBSD) and Cassava mosaic disease (CMD). Accurate and efficient detection and identification of plant viruses are fundamental aspects of virus diagnosis leading to sustainable disease management. In the present study I describe two techniques, the first based on a single tube duplex and multiplex polymerase chain reaction (m-PCR), developed for simultaneous detection of African cassava mosaic virus (ACMV), East African cassava mosaic Cameroon virus (EACMCV) and East African cassava m

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11

Pierce, Erica Joanna. "Transcriptome profiling in susceptible model and natural host systems in response to South African cassava mosaic virus." Thesis, 2014.

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Geminiviruses causes diseases to many staple food and cash crops of great economic importance worldwide. Currently eight species of Begomoviruses belonging to the Geminivirus family exist, of which South African cassava mosaic virus SACMV-[ZA:99] is a member, and is known to cause cassava mosaic disease (CMD). Cassava (Manihot esculenta, Crantz) is considered to be an important food crop consumed in many tropical, sub-tropical and African countries, and is increasingly becoming well-known for its ethanol production on a global a scale. Various strategies to control CMD are currently being impl

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12

Mabasa, Kenneth Gaza. "Epidemiology of Cassava mosaic disease and molecular characterization of Cassava mosaic viruses and their associated whitefly (Bemisia Tabaci) vector in South Africa." Thesis, 2008. http://hdl.handle.net/10539/4966.

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Cassava mosaic disease (CMD) is caused by whitefly-transmitted geminiviruses and is a major constraint to cassava production in Africa. Field surveys were conducted in three (Bushbuckridge, Mariti and Tonga) cassava growing areas of Limpopo and Mpumalanga provinces in South Africa during two seasons (2004/2005 and 2005/2006). Results showed that a higher percentage (27.1%) of CMD infection was due to the use of infected planting materials compared to whitefly borne-infections (10.4%). Disease symptoms were generally mild. There was no change in disease incidence over the survey period.

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13

Mollel, Happyness Gabriel. "Interaction and impact of cassava mosaic begomoviruses and their associated satellites." Thesis, 2014.

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Cassava (Manihot esculenta Crantz) is affected by two major viral diseases, namely Cassava brown streak disease (CBSD) and Cassava mosaic disease (CMD). Two of the most widely distributed begomoviruses in East Africa associated with CMD, are East African cassava virus- Uganda2 (EACMV-UG2) and African cassava mosaic virus (ACMV). Despite efforts of generating improved Tropical Manihot Series (TMS) by traditional breeding and using highly resistant geminivirus cassava landraces such as Tropical Manihot Esculenta1 (TME1) and Tropical Manihot Esculenta3 (TME3), more recently two circular single st

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14

Allie, Farhahna. "Gene expression studies towards the elucidation of host responses to South African cassava mosaic virus." Thesis, 2014.

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A thesis submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Doctor of Philosophy. Johannesburg, 2013.<br>Unable to load abstract.

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15

Mugerwa, Habibu. "Molecular variability of cassava Bemisia tabaci and its effects on the spread of cassava mosaic begomoviruses in East Africa." Thesis, 2014.

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Bemisia tabaci is the vector of cassava mosaic begomoviruses and cassava brown streak viruses which are main production constraints to cassava in sub-Saharan Africa. Current vector dynamics involved in the spread of both viruses in the region was established through comparison of the mitochondria cytochrome oxidase I DNA. Two distinct species were obtained: sub-Saharan Africa clade 1 (SSA1), comprising of two sub-clades (I & II), and a South West Indian Ocean Islands (SWIO) species. SSA1 sub-clade I whiteflies were widely distributed in East Africa. SSA1 sub-clade II whiteflies predominated th

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16

Ndomba, Osmund Aureus. "Influence of satellite DNA molecules on severity of cassava begomoviruses and the breakdown of resistance to cassava mosaic disease in Tanzania." Thesis, 2013. http://hdl.handle.net/10539/12427.

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Cassava Manihot esculenta Crantz (Euphorbiaceae), is a source of food for more than 700 million people in developing countries and is cultivated in estimated global area of 18.6 million hectares with total annual production of 238 million tonnes. Diseases however, take a substantial toll of yield, with CMD being the most important disease and major constraint for cassava production in Tanzania and Africa. The disease causes an estimated loss of over US$ 14 million per annum. A study was undertaken in 2006/2007 to investigate the influence of satellite DNA molecules on severity of cassava bego

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17

Freeborough, Warren. "The transcription factor interacting network of tolerant TME3 and susceptible T200 cassava landraces infected with SACMV." Thesis, 2019. https://hdl.handle.net/10539/29438.

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A dissertation submitted to the Faculty of Science of the University of Witwatersrand, Johannesburg, in full fulfilment of the requirements for the degree of Master of Science, 2019<br>Cassava, Manihot esculenta Crantz, is categorized as a food security crop, producing large starchy tubers that are gaining interest from both international and local agro-processing industries for products such as bioethanol, textiles, and food additives. However, cassava is currently under threat from a group of begomoviruses that cause cassava mosaic disease (CMD) in all countries in sub-Saharan Africa where c

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