scholarly journals New drought-tolerant rainfed upland rice (Oryza sp.) genotypes adapted to the west, centre-west, and centre regions of Côte d'Ivoire

2020 ◽  
Vol 8 (12) ◽  
pp. 289-296
Author(s):  
Noumouha Ghislain ◽  
◽  
Anguété Kouamé ◽  
Bouet Alphonse ◽  
Bahan Frank ◽  
...  
Keyword(s):  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Upland Rice ◽  
Environment Interaction ◽  
Gge Biplot ◽  
The West ◽  
Cote D’Ivoire ◽  
Côte D'ivoire ◽  
Rainfed Upland ◽  
Paddy Yield

To select new rainfed upland rice genotypes, adapted to the West, Centre-West, and Centre regions of Côte d'Ivoire, a study was conducted in research stations. Six genotypes (ART15-11-8-5-2-B-1, WAB891-SG12, WAB1092-B-40AB.1, ARCC3Fa3L10P1-1-B-1, and ART15-16-12 -3-1-B-1-B-3-1) including the control IDSA 10, widely cultivated across the country, were evaluated on three research stations of the National Center of Agricultural Research (CNRA), during the wet seasons of the year 2016 and 2017. These stations are located at the West, Center, and West-Center of Côte d'Ivoire. The trial was set up in a randomised complete block design with four replications. The agromorphological traits such as tillering ability, sowing-50% heading cycle, plant height, percentage of productive tillers, sowing-maturity cycle, and paddy yield were collected for each genotype. In all the environments evaluated, the genotypes ART15-11-8-5-2-B-1, WAB891-SG12, ARCC3Fa3L10P1-1-B-1, and ART15-16-12-3-1-B-1-B -3-1 were characterised by high percentages of productive tillers (87 to 91%), intermediate plant heights (114 to 121 cm), and high average paddy yields (2,601 to 2,810 kg/ha). Yield gains of these genotypes compared to the control ranged from 16 to 25%. The Genotype × Environment interaction (G × E) was highly significant for paddy yield (p < 0.001). The study of the interaction based on the first two principal components analysis of the GGE biplot, explained a 97% of the main effect of the Genotype and the G × E interaction. The polygon tool of the biplot suggested the existence of a single complex mega-environment. Visualizing the mean and stability of genotypes' paddy yield in the biplot indicated that genotypes ART15-11-8-5-2-B-1, WAB891-SG12, ARCC3Fa3L10P1-1-B-1, and ART15-16-12-3-1-B-1-B- 3-1 were more adapted to upland rice-growing regions of the West, Center-West, and Center of Côte d'Ivoire. These genotypes can be released for large scale rice production in these regions. Keywords: Rainfed upland rice, G × E interaction, GGE biplot analysis

Profile of migrants for cocoa production and agronomic characteristics of cocoa farms in Western Côte d'Ivoire

2021 ◽  
Vol 3 (1) ◽  
pp. 051-062
Author(s):  
Kpangui Kouassi Bruno ◽  
Sangne Yao Charles ◽  
Kouakou Kouassi Apollinaire ◽  
Koua Kadio Attey Noël ◽  
Koffi N'Guessan Achille
Keyword(s):  
Cote D'ivoire ◽  
Forest Cover ◽  
Côte D’Ivoire ◽  
The West ◽  
Cote D’Ivoire ◽  
Côte D'ivoire ◽  
Cocoa Production ◽  
Research Findings ◽  
Migrant Farmers ◽  
Cocoa Farmers

The mountainous relief of the West of Côte d'Ivoire and the large savannahs next to forests didn’t make this zone very excellent for cocoa production. However, for the last decade, an important influx of farming population has been observed in this area. The objective of this study is to analyze the dynamics of the settlement of migrant farmers in the West region of Côte d’Ivoire, using the department of Biankouma as a case of study. So, individual surveys were conducted among 203 cocoa farmers from 15 villages in the department of Biankouma, who had migrated to this region, It was found that the majority of these farmers are natives of Côte d'Ivoire (38.3%) and non-natives (33.5%) from countries in the West Africa region. The migratory flow to this region is mainly internal, with 95.6% of farmers coming from 11 Districts and 55 localities in the country. While initially (i.e., before 1985), farmers came from towns near Duékoué (11.8%), these waves of movement from towns in neighboring districts (Bas-Sassandra and Sassandra-Marahoué) to the Western Region will experience their highest rates between 2002 and 2013. Observations drawn from our research findings support the hypothesis that the political-military crisis that the country has experienced has accentuated migratory flows of farmers for cocoa production in western Côte d'Ivoire and these migratory flows could be the cause of the degradation of forest cover in the Biankouma Department.

scholarly journals Molecular evolution of Azagny virus, a newfound hantavirus harbored by the West African pygmy shrew (Crocidura obscurior) in Côte d'Ivoire

2011 ◽  
Vol 8 (1) ◽  
pp. 373 ◽  
Author(s):  
Hae Ji Kang ◽  
Blaise Kadjo ◽  
Sylvain Dubey ◽  
François Jacquet ◽  
Richard Yanagihara
Keyword(s):  
Molecular Evolution ◽  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
West African ◽  
The West ◽  
Cote D’Ivoire ◽  
Côte D'ivoire ◽  
Pygmy Shrew

Assessment of the importance of individual plant-parasitic nematode species in a community dominated by Heterodera sacchari on upland rice in Côte d'Ivoire

Nematology ◽  
2002 ◽  
Vol 4 (6) ◽  
pp. 661-669 ◽  
Author(s):  
Richard Plowright ◽  
Daniel Coyne
Keyword(s):  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Parasitic Nematode ◽  
Upland Rice ◽  
Nematode Species ◽  
Plant Parasitic Nematode ◽  
Damage Potential ◽  
Cote D’Ivoire ◽  
Côte D'ivoire ◽  
Plant Parasitic

AbstractIn temperate climates, densities of plant-parasitic nematodes at or shortly before sowing are a useful predictor of their damage potential. Re-examination of data from nematode communities on upland rice in Côte d'Ivoire showed that interpretation of nematode pest potentials and the damage caused by either individual species, or by the community as a whole, is less simple. The numerical proportion of individual nematode species within a plant-parasitic nematode community, comprising Heterodera sacchari, Pratylenchus zeae , Meloidogyne incognita, Helicotylenchus dihystera, Mesocriconema tescorum and Xiphinema spp., changed with duration of the cropping cycle. The relative importance to the crop of the different species changed with time, and with development of the community structure over the course of the season. Analysis suggested that for H.sacchari, the mid-season population densities were most highly correlated with crop damage (yield loss) and therefore its damage potential for that particular season. The pest potential of other known rice pest species, such as M. incognita and P.zeae, was likely indicated earlier in the season, but the population increase of other nematode species in the community, particularly H. sacchari, compounded the interpretation of the data for other species. The use of single linear regression to assess the importance of individual nematode species conflicted with results of analyses using multiple stepwise regression, while use of cluster analysis permitted the identification of species groups at early and late stages in the cropping season.

scholarly journals Distribution, Pathogenicity, and Interactions of Two Strains of Rice yellow mottle virus in Forested and Savanna Zones of West Africa

Plant Disease ◽  
2001 ◽  
Vol 85 (1) ◽  
pp. 59-64 ◽  
Author(s):  
P. N'Guessan ◽  
A. Pinel ◽  
A. A. Sy ◽  
A. Ghesquière ◽  
D. Fargette
Keyword(s):  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Mottle Virus ◽  
Rice Yellow Mottle Virus ◽  
Yield Losses ◽  
The West ◽  
Cote D’Ivoire ◽  
Côte D'ivoire ◽  
Yellow Mottle ◽  
The Impact

In Côte d'Ivoire, the S2 strain of Rice yellow mottle virus (RYMV) predominated in the forested zones, including the “rice belt” to the west, in each of the cropping systems where rice was grown. The S1 strain occurred more frequently in the northern Guinean savanna, and only S1 isolates were found further north in the Sahelo-Soudanian zones. In mixed infection, S2 dominated over S1 both in viral capsid and RNA contents under temperature regimes encompassing those observed in savanna and forested zones of Côte d'Ivoire. There was no evidence of interactions in virus accumulation between the West African strains S1 or S2 with the more distantly related East African strain S4. Field trials emphasized the impact of RYMV, which induced yield losses of 40 to 60% in several widely grown cultivars of Oryza sativa indica and O. sativa japonica. We report the high resistance of the O. indica cv. Gigante under field conditions which was apparent with all the S1 and S2 isolates tested. Responses to RYMV infection of several cultivars were isolate dependent. With most differential cultivars, responses were not strain specific, with the exception of the O. japonica cv. Idsa6, in which the S2 isolates always induced higher yield losses than the S1 isolates.

scholarly journals Promising High-Yielding Tetraploid Plantain-Bred Hybrids in West Africa

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Abdou Tenkouano ◽  
Niéyidouba Lamien ◽  
Josephine Agogbua ◽  
Delphine Amah ◽  
Rony Swennen ◽  
...  
Keyword(s):  
West Africa ◽  
Research And Development ◽  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Central Africa ◽  
International Institute ◽  
The West ◽  
Cote D’Ivoire ◽  
Côte D'ivoire ◽  
West And Central Africa

The devastating threat of black leaf streak disease caused by Pseudocercospora fijiensis on plantain production in West Africa spurred the development of resistant hybrids. The goal of this research and development (R&D) undertaken was assessing the development and dissemination of two plantain hybrids PITA 3 and FHIA 21 bred in the 1980s by the International Institute of Tropical Agriculture (IITA, Nigeria) and the Fundación Hondureña de Investigación Agrícola (FHIA, Honduras), respectively. In Côte d’Ivoire, plantain growers selected PITA 3 and FHIA 21 based on their improved agronomic characteristics and, between 2012 and 2016, they were massively propagated and distributed to farmers in Benin, Burkina Faso, Côte d’Ivoire, and Togo under the West Africa Agricultural Productivity Program (WAAAP) coordinated by the West and Central Africa Council for Agricultural Research and Development (CORAF). In 2016, the Centre National de Recherche Agronomique in Côte d’Ivoire included the hybrids in the improved cultivar directory. This R&D activity illustrates how three decades of crossbreeding, selection, and distribution led to local acceptance. It also highlights how a CORAF-led partnership harnessed CGIAR research for development. The dissemination and acceptance of these plantain hybrids will enhance the sustainable intensification in plantain-based farming systems across the humid lowlands of West and Central Africa.

scholarly journals First Report of Cucumber mosaic virus in Yams (Dioscorea spp.) in Ghana, Togo, and Republic of Benin in West Africa

Plant Disease ◽  
2008 ◽  
Vol 92 (5) ◽  
pp. 833-833 ◽  
Author(s):  
A. O. Eni ◽  
P. Lava Kumar ◽  
R. Asiedu ◽  
O. J. Alabi ◽  
R. A. Naidu ◽  
...  
Keyword(s):  
West Africa ◽  
Mosaic Virus ◽  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Rt Pcr ◽  
The West ◽  
Cote D’Ivoire ◽  
Côte D'ivoire ◽  
Republic Of Benin ◽  
The Republic

Yam (Dioscorea spp., family Dioscoreaceae) is one of the most important food crops cultivated in the West African yam zone comprising the forest and savannah areas of Nigeria, Ghana, Côte d'Ivoire, Republic of Benin, and Togo, which account for more than 90% of the 4.59 million ha of yam cultivation worldwide (1). A survey was conducted in 2005 to document viruses in yams in Ghana, Togo, and the Republic of Benin. Samples (1,405) from five species of yam showing mosaic, chlorosis, and stunting as well as asymptomatic plants were tested for Dioscorea bacilliform virus (DBV, genus Badnavirus), Yam mosaic virus (YMV, genus Potyvirus), and Yam mild mosaic virus (YMMV, genus Potyvirus), the three most common viruses infecting yams. In addition, samples were tested for Cucumber mosaic virus (CMV), since CMV was previously reported to infect yams in Côte d'Ivoire (2) and Nigeria (3). In protein-A sandwich-ELISA with polyclonal antibodies to a cowpea isolate of CMV, 23 of the 1,405 samples (6 of 218 samples from Togo, 13 of 628 samples from Ghana, and 4 of 559 samples from Republic of Benin) tested positive for CMV. The CMV-positive samples were from D. alata (N = 16) and D. rotundata (N = 7), whereas all samples from D. cayenensis, D. dumetorum, and D. bulbifera tested negative. CMV was detected as mixed infections with DBV, YMV, or YMMV in 21 of 23 samples. Some of these samples showed puckering, chlorosis, mottling, and crinkling, whereas some plants infected by two or more viruses were asymptomatic. Only two samples from D. rotundata had a single infection of CMV and they showed mild chlorotic symptoms in young leaves that were inconspicuous in mature leaves. In sap inoculations, the virus induced systemic mosaic in Nicotiana glutinosa. The presence of CMV in ELISA-positive yam samples was further confirmed by immunocapture-reverse transcription (IC-RT)-PCR using CMV antibodies as trapping antibody and oligonucleotide primers specific for a 485 nt corresponding to 3′ end of the coat protein gene and C-terminal noncoding region of RNA-3 (4). To confirm the specificity of IC-RT-PCR, the 485-bp amplicons from an isolate from the Republic of Benin was cloned into pCR2.1 (Invitrogen, Carlsbad, CA) and three independent clones were sequenced from both orientations. Pairwise comparison of a consensus sequence (Accession No. EU274471) with corresponding sequences of other CMV isolates deposited in GenBank showed 99% identity at the nucleotide sequence level (Accession No. U22821) and revealed that the CMV isolate from yam belongs to sub-Group IA. To our knowledge, this is the first report of CMV infection in yams (D. alata and D. rotundata) in Ghana, Togo, and the Republic of Benin. Together with a previous documentation of CMV in D. alata and D. trifida in Côte d'Ivoire and Nigeria (2,3), this report adds to existing knowledge on distribution of CMV in yams with implications for yam production and germplasm distribution in the West Africa Region. References: (1) FAO. Online publication. FAOSTAT, 2007. (2) C. Fauquet and J. C. Thouvenel. Plant Viral Diseases in the Ivory Coast. ORSTROM: Documentation Techniques. Paris, 1987. (3) Jd'A. Hughes et al. Phytopathology 87:S45, 1997. (4) S. Wylie et al. Aus. J. Agric. Res. 44:41, 1993.

scholarly journals Dynamics of Human Pressures on the Mont Péko National Park (West-Côte d'Ivoire)

2018 ◽  
Vol 14 (11) ◽  
pp. 109 ◽  
Author(s):  
Ousmane Sidibe ◽  
Kouassi Kouadio Henri ◽  
Zadou Didie Armand ◽  
Kouame Djaha ◽  
Karidia Traore
Keyword(s):  
Cote D'ivoire ◽  
National Park ◽  
Côte D’Ivoire ◽  
Human Pressure ◽  
The West ◽  
Cote D’Ivoire ◽  
Côte D'ivoire ◽  
Wwf International

The Mont Péko national Park (MPNP) located to the West of Côte d'Ivoire underwent severe human pressure related to a succession of political and military crises from 2002 to 2011. Since 2013, the Ivoirians government is engaged in a process of rehabilitation of this park. This study aimed to evaluate the dynamics of human pressures from 1996 to 2018, in order to allow the manager of the park to better focus their awareness and protection activities. To achieve this, the RAPPAM method of WWF international was adopted for the collection of data. The study identified 10 types of pressures of which farm is the most severe followed by pressure on land, logging, bush fires, the establishment of settlements, poaching and pollution. The intensity of pressures on the MPNP doesn’t significantly vary depending on the areas, but this varies according to the socio-political gradient in time. The pressures have evolved gradually from 2002 to 2011 before beginning to decline progressively until 2018. Currently, except for uncontrolled bush fires, all pressures declined significantly, or even disappear for some. The existence of a variety of pressures on the MPNP to disturbing proportions is therefore related in part to the lack of monitoring during the crises. The anthropization of the MPNP found the springs of its acceleration in the existence of an armed gang who have organized, systematic exploitation of the resources.

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