Rice yellow mottle virus in West Africa

Awoderu, V. A.

doi:10.1080/09670879109371614

Cited by 42 publications

(30 citation statements)

References 5 publications

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“…According to the farmers the main cause of the disease was the use of excessive nitrogen fertilizer. In a study conducted in Suakoko, Liberia, with 16 rice cultivar, the incidence of the blast increased when nitrogen was increased from 60 kg N to 120 kg N ha -1 (Awoderu 1983). This indicates the risk of excessive use of nitrogen fertilizers.…”

Section: Resultsmentioning

confidence: 99%

Investigating the impact of rice blast disease on the livelihood of the local farmers in greater Mwea region of Kenya

et al. 2013

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Rice is the most important cereal crop in Kenya coming third after maize and wheat. It forms a very important diet for a majority of families in Kenya. The demand for rice in Kenya has seen a dramatic increase over the last few years while production has remained low. This is because rice production has been faced by serious constraints notably plant diseases of which the most devastating is rice blast. Rice blast is known to cause approximately 60% -100% yield losses. It is caused by an Ascomycete fungus called Magnaporthe Oryzae. The aim of this study was to investigate the impact of rice blast disease on the livelihood of the local farmers in Greater Mwea region and develop a rice blast disease distribution map using GIS approach. The study methodology employed a questionnaire survey which were subjected to sample population of households in the 7 sections with 70 blocks within Mwea region. The collected data was analysed using SAS Version 9.1. Descriptive statistics were used to summarize the household characteristics, the farm characteristics and the farmers’ perceptions of rice blast disease. In the questionnaire, farmers’ response on whether they had been affected by rice blast disease and the total production per acreage was used to develop an attribute table with GPS points. The GPS points were interpolated to create a geographical distribution map of rice blast disease. From the research findings almost all the farmers’ had awareness and knowledge of rice blast disease, 98% of the farmers interviewed were aware of rice blast disease. Out of the 98% with knowledge and awareness 76% have been affected by the disease, while 24% have never been affected. Farmers attributed rice blast disease to a range of different causes, including excessive use of nitrogen fertilizer, water shortage, lack of proper drainage canal and due to climate change. Majority of the farmers interviewed (72%) did not engage themselves in any other socio-economic activity even after being affected by the rice blast disease. 15% opted to growing horticultural crops, 7% engaged in trading activities while 2% started livestock raring, wage earning and Boda boda business.

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Section: Resultsmentioning

confidence: 99%

Investigating the impact of rice blast disease on the livelihood of the local farmers in greater Mwea region of Kenya

et al. 2013

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“…Coulibaly and N'guessan (1994) indicated infection of E. indica in host range studies in Cote d'Ivoire using back inoculation to a susceptible rice host. According to Okioma et al (1983), in East Africa and Awoderu (1991a) in West Africa, the grasses (Dinebra retroflexa, Eleusine indica, Eragrostis tenifolia, Pheleum arenanum) and wild Oryza species which occur abundantly around rice fields are likely important reservoirs of the virus during the off-season. RYMV was also found in Oryza longistaminata, a wild species of rice growing in marshy areas and in rice fields in Niger, Mali (John et al, 1984), Senegal (Mbodj et al, 1984), and Burkina Faso (Konate, 1995).…”

Section: Host Plantsmentioning

confidence: 99%

An Overview of the Mode of Transmission, Host Plants and Methods of Detection of Rice Yellow Mottle Virus

Abo

Alegbejo²,

et al. 2000

Journal of Sustainable Agriculture

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Investigations on the mode of transmission of rice yellow mottle virus (RYMV) revealed that it is located in the rice husks. It is therefore, not transmitted through rice seeds. The virus was transmitted through leaf debris, empty rice spikelets, intertwining roots, leaf contact, rice stubble, contaminated hands and from closely spaced plants. Chrysomelid beetles, Chnootriba similis Thurnberg (Coccinelidae) and some long homed grasshoppers transmitted RYMV. The virus is not transmitted by nematodes. Oryza sativa L., O. glaberrima, and O. barthii are systemic hosts while O. longistaminata and a few weed species are local lesion hosts. The virus was readily detected by visual assessment based on the standard evaluation system (SES) and a serological test utilising enzyme linked immunosorbent assay (ELISA) and agar gel diffusion.

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“…It now occurs in most rice-growing African countries including Madagascar (Abo et al, 1998;, but not outside the African continent. Thus, it was speculated that RYMV is an indigenous virus which gained importance with the intensification of rice production and the introduction of a diversity of exotic varieties mainly from Asia (Awoderu, 1991;Thresh, 1998).…”

Section: Introductionmentioning

confidence: 99%

Rice seedbeds as a source of primary infection by Rice yellow mottle virus

Traoré

Fargette

et al. 2006

Eur J Plant Pathol

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The effect of contamination of rice seedlings by Rice yellow mottle virus (RYMV) in seedbeds on the onset and spread of rice yellow mottle in the field was investigated. Rice seedlings were artificially contaminated in seedbeds at different rates (0.1, 0.5, and 2.5%) and pooled in bundles before transplantation, as done by farmers. RYMV was successfully transmitted through contaminated hands and bundling healthy and diseased seedlings together. Hand contamination was responsible for 4.5% infection. Disease incidence in the field after secondary spread reached 32% for 2.5% seedbed contamination rate but remained limited (less than 10%) for all other rates. Eradicating infected plants from seedbeds lessened disease incidence in the field. This technique may be used in conjunction with other prophylactic measures to efficiently control rice yellow mottle disease.

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Rice yellow mottle virus in West Africa

Cited by 42 publications

References 5 publications

Investigating the impact of rice blast disease on the livelihood of the local farmers in greater Mwea region of Kenya

Investigating the impact of rice blast disease on the livelihood of the local farmers in greater Mwea region of Kenya

An Overview of the Mode of Transmission, Host Plants and Methods of Detection of Rice Yellow Mottle Virus

Rice seedbeds as a source of primary infection by Rice yellow mottle virus

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