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Tuesday, November 24, 2020 | History

3 edition of African cassava mosaic found in the catalog.

African cassava mosaic

African cassava mosaic

report of an interdisciplinary workshop held at Muguga, Kenya, 19-22 February, 1976

by

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  • 24 Currently reading

Published by International Development Research Centre in Ottawa .
Written in English

    Places:
  • Africa, East
    • Subjects:
    • Cassava mosaic disease -- Congresses.,
    • Cassava mosaic disease -- Africa, East -- Congresses,

    • Edition Notes

      Statementeditor, Barry L. Nestel ; cosponsored by the East African Agriculture and Forestry Research Organization and the International Development Research Centre.
      ContributionsNestel, Barry L., East African Agriculture and Forestry Research Organization., International Development Research Centre (Canada)
      Classifications
      LC ClassificationsSB608.C33 A37
      The Physical Object
      Pagination48 p. :
      Number of Pages48
      ID Numbers
      Open LibraryOL4491472M
      ISBN 100889360960
      LC Control Number79321249
      OCLC/WorldCa3746018

        Cassava mosaic disease is one of the most important biotic constraint affecting Cassava limiting the production potential of the crop in Northern Nigeria. This study was carried out to evaluate the current status of Cassava mosaic disease incidence, severity, infection type, whitefly abundance in the farmers’ field as well as to determine the virus strains causing the disease in Bauchi State. Cassava production in Africa is constrained by cassava mosaic disease (CMD) that is caused by the Cassava mosaic virus (CMV). The aim of this study was to evaluate the responses of a range of commonly cultivated West African cassava cultivars to varying inoculum doses of African cassava mosaic virus (ACMV).   A local variety of cassava showing signs of mosaic disease. Many farmers' crops have the African Cassava Mosaic Virus (ACMV) which causes the plants to wilt. Oxfam is working with special disease-resistant strains of cassava, “sawa sawa”, which also give high yields. They are resistant to the African Cassava Mosaic Virus. Photo: Caroline Gluck/Oxfam Read more: Oxfam's work in the Views: K. Alternate hosts of African cassava mosaic virus and East African cassava mosaic Cameroon virus in; sequence identity with cassava isolates from West Africa. Cassava Mosaic Disease. Cassava is vulnerable to a broad range of diseases caused by viruses (Table 1); East African cassava mosaic Cameroon virus.


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African cassava mosaic Download PDF EPUB FB2

The cassava mosaic virus disease (CMD) is considered the most devastating disease of cassava in Africa. Annual yield loose on the continent amount to over billion tonnes of storage root, at a cost of US $ million.

The use of resistance cultivars is the most effective means of control, however, over the years a single source of resistance Author: Yvonne Lokko.

Buy Diversity of Bemisia tabaci, Vector of African cassava mosaic virus: Bemisia tabaci's genotype determines its virus transmission ability on FREE SHIPPING on Price: $   Get this from a library.

African cassava mosaic: report of an interdisciplinary workshop held at Muguga, Kenya, February, [Barry L Nestel; East African Agriculture and Forestry Research Organization.; International Development Research Centre (Canada);].

77 Diversity of African Cassava Mosaic Disease CHAPTER The Diversity of Cassava Mosaic Begomoviruses in Africa Peter Markham*, Robert Briddon*, Clotilde Roussot*, John Farquhar*, Geoffrey Okao-Okuja** and James Legg*** Introduction Cassava mosaic disease (CMD) is the. ACMV+EACMV ACMV and EACMV ACMV SS ACMV4 African cassava mosaic Agric begomoviruses cassava mosaic disease cassava mosaic virus CMD symptoms CMD WF Sample collected contained Cultivar SS isolate cultivation detected distribution double infections EACMV-Ug2 East African cassava Ebonyi Ege dudu Ekiti Enugu express farmers farms Figure.

In vitro techniques for the control of cassava mosaic disease, 0. Gamborg and K. Kartha 30 Symptomatology of cassava mosaic disease and a proposal for further study to categorize the variants, E. Terry and D. Jennings 36 Breeding for resistance to African cassava mosaic disease: progress and prospects, D.

PDF | OnAlabi Olufemi Joseph and others published Cassava mosaic disease: A curse to food security in Sub-Saharan Africa | Find, read and cite all the research you need on ResearchGate. Cassava mosaic disease (CMD) is caused by whiteflyborne viruses of the genus Begomovirus (family Geminiviridae).The disease has long been regarded as the most important of those affecting cassava in sub‐Saharan Africa, and has been the subject of much research, especially since the onset of the current very damaging pandemic in eastern and central Africa.

African Cassava Mosaic Virus: Etiology, Epidemiology, and Control Cassava (Munihor escuknra CrantE; Euphorbiaceae) is the only species in its genus that is cultivated as a food crop. In South America, where it originated. cassava was domesticated 2, years B.c., yet only recently has it become distributed worldwide.

The Portuguese. Cassava mosaic virus is the common name used to refer to any of eleven different species of plant pathogenic virus in the genus Begomovirus. African cassava mosaic virus (ACMV), East African cassava mosaic virus (EACMV), and South African cassava mosaic virus (SACMV) are distinct species of circular single-stranded DNA viruses which are transmitted by whiteflies and primarily infect cassava.

The spread of African cassava mosaic disease (ACMV) into healthy cassava fields was recorded at weekly intervals. In addition, 21 yellow water traps were placed in one field and the number of whiteflies caught was recorded twice a week.

The number of Bemisia spp. feeding on cassava was also estimated. Cassava is a major tropical tuber crop found throughout the tropics (India, Oceania, Africa and Latin America). Hitherto, there has been no single text covering all aspects of cassava biology, production and African cassava mosaic book.

This book fills that gap, representing the first comprehensive research level overview of this main staple crop. Chapters are written by leading experts in this field from all /5(2). Notes on Taxonomy and Nomenclature Top of page.

Cassava mosaic disease (CMD) Cassava mosaic disease in Africa and the Indian subcontinent is caused by one, or a mixture, of the 10 definitive and one tentative species of distinct cassava mosaic geminiviruses (CMGs): African cassava mosaic virus (ACMV), East African cassava mosaic virus (EACMV), East African cassava mosaic Malawi virus.

Cassava (Manihot species) is a crop of the humid tropics that belongs to the family Euphorbiaceae. Cultivated forms belong to the species “Manihot esculenta Crantz” and “Manihot utilissima Pohl.” Africa produces about 50–80 million tonnes of cassava annually; this translates into an average of more than calories per day for more than million people.

African cassava mosaic virus (ACMV) is a member of the genus Begomovirus in the family Geminiviridae. ACMV was the first of 10 recognized and one tentative begomovirus species characterized from cassava plants affected by cassava mosaic disease (CMD).

Historically, the first report of CMD came from the Usambaras Mountains range in northeast. However, the productivity of cassava in sub-Saharan Africa is generally low, in part due to the deleterious effects of pests and diseases.

Cassava brown streak virus disease in coastal areas of eastern and southern Africa and cassava mosaic virus disease in all regions, are two of the most important biotic constraints and greatly.

South West and North Central Nigeria: Assessment of cassava mosaic disease and field status of African cassava mosaic virus and East African cassava mosaic virus Angela O. Eni1,2 | Oghenevwairhe P.

Efekemo1,2 | Olabode A. Onile-ere1,2 | Justin S. Pita3 1Department of Biological Sciences, College of Science and Technology, Covenant University. The causal agent of CMD was initially named as cassava latent virus (Bock, Guthrie, & Figueiredo, ) but was subsequently characterized and renamed as African cassava mosaic virus (ACMV) (Bock & Woods, ; Stanley & Gay, ) (genus Begomovirus; family Geminiviridae).Between andseven different Begomovirus species were identified in association with CMD in different regions of.

East African cassava mosaic Kenya virus, EACMKV; and East African cassava mosaic Cameroon virus, EACMCV). Phylogeographic analyses suggest that CMG’s presence on these SWIO islands is probably the result of at least four independent introduction events from mainland Africa occurring between and Amongst the islands of.

African cassava mosaic geminivirus ATCC ® ™ Designation: pCLVO12 TypeStrain=False Application: The experimental host is Nicotiana benthamiana. African cassava mosaic virus in single infection was the predominant causal agent of CMD in IITA experimental fields under study.

Keywords: improved cassava genotypes, cassava mosaic disease. Book Chapter. Metadata East African cassava mosaic virus-Uganda (EACMV-UG), has been associated with a pandemic of unusually severe CMD, which has affected much of East and Central Africa, leading to production losses of 47%, equivalent to nearly 14 million tonnes.

Although the deployment of conventionally-bred host plant resistance is the. Cassava mosaic disease (CMD) is a widespread viral disease that causes high yield losses in susceptible genotypes in Sub-Saharan Africa.

Effective control of CMD is beneficial and justifiable since cassava is an important source of carbohydrates for over million people in most African countries where the crop is grown. African cassava mosaic virus (ACMV, ICTV approved acronym) is a plant pathogenic virus of the family Geminiviridae that may cause either a mosaic appearance to plant leaves, or chlorosis, a loss of Manihot esculenta (cassava), a highly valuable African food crop, the virus causes severe a is a staple food crop in many places throughout the tropics and subtropics as.

Others are Sinoxylon conigerum Gerstaecker, Achatina Fulica, Meloidogyne spp, Oxalias latifolia Kunth, African cassava mosaic virus (ACMV), Xanthomonas (Bondar), Vauterin et al. This paper considers the various estimates that have been made since of the losses caused by African cassava mosaic disease (ACMD).

It is suggested from the limited evidence available that the overall incidence of ACMD is currently % and that diseased plants sustain losses of %. On these plausible assumptions losses in Africa are %, equivalent to million tonnes.

of African Cassava Mosaic (ACM), the magnitude of the latter factor is known with certainty, since practically aIl cassava plants grown in Africa are virus-infected. This fact was unanimously reaffirmed in our investigation covering thfr 25 African producing countries participating in this seminar on African Cassava Mosaic.

Fig. Genome organization of DNA A and DNA B components of cassava-infecting begomoviruses. The genomic maps were drawn based on DNA A (GenBank Accession No.

X) and DNA B (GenBank Accession No. X) sequences of African cassava mosaic reading frames (ORFs) are denoted as either being encoded in the virion-sense (V) or complementary-sense (C) strand. Plants that are infected by mixed CMGs typically express more severe symptoms than those with single infections.

For example, plants that are co-infected with ACMV and EACMV-UG show severe foliar symptoms, as observed in the pandemic movement of a severe form of cassava mosaic disease in East Africa (Zhou et al., ). East African cassava mosaic virus-Uganda3 Mild East African cassava mosaic virus-Uganda3 Severe Disclaimer: The NCBI taxonomy database is not an authoritative source for nomenclature or classification - please consult the relevant scientific literature for the most reliable information.

African Cassava Mosaic Disease, a vector-borne plant disease, causes massive food shortages throughout sub-Saharan Africa. A system of ordinary di erential equa-tions is used to nd the equilibrium values of the white y vector and the cassava plants it a ects.

The temporal ODE system is modi ed to incorporate the spatial. African cassava mosaic virus (ACMV00) Menu. Overview; For publication in journals, books or magazines, permission should be obtained from the original photographers with a copy to EPPO. Filter photos by tag: All; Symptoms; Symptoms of African cassava mosaic virus.

Courtesy: Parthasarathy Seethapathy. Symptoms of African cassava mosaic virus. Cassava mosaic disease (CMD) is a major constraint to sustainable production of cassava (Manihot esculenta Crantz) in Zambia and other sub-Saharan African countries.

During a survey conducted between April and May in six (Western, Northwestern, Northern, Luapula, Lusaka, and Eastern) provinces of Zambia, symptomatic cassava leaf tissue samples were. Introduction. In East Africa, African cassava mosaic virus is the most important single factor limiting cassava production.

Its wide distribution in the region is primarily due to the use infected planting material, the widespread presence of the vector (Bemisia tabaci) and the use of traditional local varieties that are susceptible to the virus.

During the s, a pandemic of an unusually. A cassava protoplast system for screening genes associated with the response to South African cassava mosaic virus. Virol J. ; 17(1) (ISSN: X) Chatukuta P; Rey MEC. Keywords: African cassava mosaic virus-Cameroon, landraces, Manihot, resistance Introduction Cassava mosaic geminiviruses (CMGs) have been reported from many cassava growing countries in Africa and the cassava mosaic disease (CMD) induced by them.

An epidemiological model of African cassava mosaic virus disease (ACMD) was developed in which the dynamics within a locality, of healthy and infected cassava, and of infective and non-infective whitefly vectors, were specified.

Cassava is propagated routinely from stem cuttings. If the exclusive use of virus-free cuttings was assumed then either a high rate of virus transmission by the vector. African Cassava Mosaic. African cassava mosaic occurs in all countries of sub-Saharan Africa where cassava is grown, in India, and in many islands of southern Asia.

In Africa, where cassava is by far the largest source of carbohydrates for human food, African cassava mosaic is extremely widespread, affecting 80 to % of all cassava plants and. A cassava protoplast system for screening genes associated with the response to South African cassava mosaic virus.

Overview of attention for article published in Virology Journal, November Altmetric Badge. About this Attention Score Average Attention. Bock, K.R. Some aspects of the epidemiology of African cassava mosaic virus in coastal districts of Kenya.

In C. Fauquet and D. Fargette, eds., Proceedings International Seminar on African Cassava Mosaic Disease and Its Control. Yamoussoukro, Côte d’Ivoire, 4–8 May CTA/FAO/ ORSTOM/IITA/IAPC, pp. – Google Scholar. Two types of geminate structures were purified from African cassava mosaic geminivirus (ACMV)-infected Nicotiana benthamiana plants and analyzed by electron cryomicroscopy and image reconstruction.

After cesium sulfate density gradient centrifugation, they were separated into lighter top (T) and heavier bottom (B) components.Cassava leaf showing symptoms of African cassava mosaic virus Cassava stem showing bacterial gum exu- dations resultihg from CBB infection Cassava leaf showing an attack of CBB Cassava plant showing defoliated stems, commonly referred to as 'candlesticks', resulting from severe CBB infection Cassava leaf showing an attack of brown leaf spot.

Cassava production in Africa is constrained by cassava mosaic disease (CMD) that is caused by the Cassava mosaic virus (CMV). The aim of this study was to evaluate the responses of a range of commonly cultivated West African cassava cultivars to varying inoculum doses of African cassava mosaic virus (ACMV).

We grafted 10 cultivars of cassava plants with different inoculum .