scholarly journals Fluctuation in Yam Nematodes Depending on the Phenological Stages of the Main Yam Species (Dioscorea alata L.) Cultivated in Côte d’Ivoire

2020 ◽  
pp. 30-44
Author(s):  
Yadom Y. F. R. Kouakou ◽  
Kouamé Daniel Kra ◽  
Hortense Atta Diallo
Keyword(s):  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Correlation Coefficients ◽  
Phenological Stages ◽  
Dry Rot ◽  
Cote D’Ivoire ◽  
Pratylenchus Coffeae ◽  
Côte D'ivoire ◽  
Meloidogyne Spp ◽  
Production Areas

The telluric factors favorable to nematode pathogenic diversity make yam nematode control ineffective. This work aims at studying the fluctuation in yam nematodes depending on yam phenological stages. Trials were implemented in four yam production areas in Côte d'Ivoire. After inventory of symptoms on yam tubers, the nematodes associated with the symptoms were extracted and identified. The correlation coefficients between the severity of symptoms on tubers and the size of the associated nematode populations were determined. The size of nematode populations associated with the symptoms were determined in 100 g of soil and 100 g of yam peel were determined depending on the phenological stages of yam plants. Galls, cracks, dry and wet rot were observed on harvested yam tubers. Globodera, Meloidogyne spp., Pratylenchus coffeae and Xiphinema were the nematodes associated with the symptoms. Pratylenchus coffeae was strongly involved in the development of cracks (r = 0.75) and dry rot (r = 0.86) then Meloidogyne spp. in that of galls (r = 0.78). Pratylenchus coffeae and Meloidogyne spp. fluctuation in cultivation soils and yam tubers is influenced by yam phenological stages. Their numbers increase in soils and tubers before tuberization initiation. Producers could draw on the results of this study to establish a schedule of nematicide treatments that could start as soon as yam seeds are planted.

scholarly journals Bionomics and Importance of an Emerging Pest Pseudotheraptus devastans (Distant) (Heteroptera: Coreidae) in the Cocoa Orchards of Côte d'Ivoire

2021 ◽  
pp. 114-121
Author(s):  
Norbert N’Dri Kouamé ◽  
François Kouamé N’Guessan ◽  
Pierre Walet N’Guessan ◽  
Alain Jacques Acka Kotaix ◽  
Yao Tano
Keyword(s):  
Cote D'ivoire ◽  
Ivory Coast ◽  
Côte D’Ivoire ◽  
Cote D’Ivoire ◽  
Côte D'ivoire ◽  
Cocoa Production ◽  
Production Areas ◽  
Cocoa Tree

The cocoa tree is a very important plant in Côte d'Ivoire (formerly known as Ivory Coast) with a production of 2,15 million  tons. In spite of this performance, cocoa production is attacked by several pests of which the emerging ones are Pseudotheraptus devastans (Distant). These insects  attack  cherelles,  pods, gourmands and young shoots. This study aims to locate these pests and determine their importance in the different cocoa production areas. The device used is total  randomization. The leaching carried out in the orchard revealed the presence of P.devastans in all the cocoa producing districts. The means were 0,02 ± 0,00 to 2,35 ± 0,38 P. devastans  / tree.  The  districts of Sassandra-Marahoué, Comoé and Montagnes recorded  more  P.devastans.  However, the districts of Bas-Sassandra, Lagunes et Lacs had fewer P.devastans.

scholarly journals Les Contraintes Des Coopératives Dans Le Commerce De La Noix De La Cola À Bouaké (Côte d’Ivoire)

2018 ◽  
Vol 14 (2) ◽  
pp. 68
Author(s):  
Djibli Vincent Dibi
Keyword(s):  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Agricultural Sector ◽  
Foreign Currency ◽  
Direct Access ◽  
Agricultural Cooperatives ◽  
Sharp Decline ◽  
Cote D’Ivoire ◽  
Côte D'ivoire ◽  
Production Areas

This article is an attempt to understand and analyze the difficulties encountered by agricultural cooperatives in the marketing of cola nuts. Despite the considerable capital generated by this sector, many difficulties are hampering the agricultural sector, which results in a sharp decline in the profits of cooperatives and producers. For the members, this is due to the lack or little commitment of the Ivorian State to revitalize this promising sector as is the case with the coffee-cocoa pair. In fact, the fact that foreign traders have direct access to growers in their production areas without going through a central structure, in particular the wholesale marketBouake, weakens domestic traders. Similarly, this situation prevents the Ivorian export circuit of Cola from having a substantial tonnage and allowing the entry of foreign currency into the country. All this contributes to devalue the label of the cola nut produced in Cote d'Ivoire.

scholarly journals Caractérisation des insectes et des champignons infestant les fèves de cacao dans les principales zones de production en Côte d’Ivoire

2018 ◽  
Vol 14 (33) ◽  
pp. 298
Author(s):  
Brou Julien Kouiakou ◽  
Bi Zahouli Irie ◽  
Kouadio Emmanuel N’goran ◽  
Brou Kouame ◽  
Acka Emmanuel Dick ◽  
...  
Keyword(s):  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Cocoa Beans ◽  
Mushroom Species ◽  
Cote D’Ivoire ◽  
Great Satisfaction ◽  
Côte D'ivoire ◽  
Production Areas ◽  
Appearance Frequency

If the culture of the cocoa in Côte d’Ivoire gives a great satisfaction concerning the production level, the quality of raw cocoa beans remains to be improved. One of the causes of this depreciation is the moulds development in beans. In order to identify responsible fungus, cocoa beens have been collected in the maine production areas which are the East, the Mid-West and the South-West, represented respectively by the localities of Abengourou, Oumé and Soubré. From collected beans, the fungus have been insulated and purified on PDA medium and then, they have been identified by observing their morphocultural and microscopic characteristics. The results show that 9 mushroom species belonging to 5 genera were identified in cocoa beans collected in the whole of the localities. There are Aspergillus, Penicillium, Fusarium, Curvularia and Streptomyces. Among them, the Aspergillus genus which is able to produce ochratoxine, was found with an appearance frequency of 86.30 %.

scholarly journals Morphological Characteristics of Scutellonema bradys Populations Responsible for Yam Dry Rot in Côte d’Ivoire

2021 ◽  
pp. 43-59
Author(s):  
Yadom Y. F. R. Kouakou ◽  
Kouamé Daniel Kra ◽  
Toualy Marie Noël Yeyeh ◽  
Hortense Atta Diallo
Keyword(s):  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Morphological Variability ◽  
Morphological Characteristics ◽  
Principal Component ◽  
Morphological Characterization ◽  
Food Markets ◽  
Dry Rot ◽  
Cote D’Ivoire ◽  
Côte D'ivoire

The great diversity of agroecological factors that cover the yam production area in Côte d’Ivoire can be a source of morphological variability within Scutellonema bradys species, responsible for yam dry rot. This study aims at identifying the morphological group(s) of S. bradys which infect(s) yam Dioscorea cayenensis-rotundata. Two hundred ten yam tubers for sale in food markets in the Autonomous District of Abidjan were sampled from traders. After extraction and identification, a morphological characterization was carried out on S. bradys populations using morphological descriptors. Yam tubers sampled from food markets came from three agroecological zones namely dry tropical savannah, semi-deciduous dense forest and transitional forest areas. Morphometric variables and ratios used individually did not help identify morphological groups. Principal component analysis, however, performed with the most discriminating variables and ratios revealed three morphological groups named "large", "medium" and "small" in males and females and confirmed by the agglomerative hierarchical clustering. Each group consisted of a rate greater than 48% of individuals from a given agroecological zone. Three morphological groups of S. bradys are associated with yam dry rot in Côte d’Ivoire. Pathogenic and molecular characterization of the morphological groups would be necessary with a view to researching control methods.

scholarly journals Determination of Merchantability of Maize (Zea mays L.) as Epis, Spathes and Grains Stocked in the Production Areas of Côte d'Ivoire

2020 ◽  
pp. 1-10
Author(s):  
Sira Bamba ◽  
Henri Marius Godi Biego ◽  
Adama Coulibaly ◽  
Yves B. Nyamien ◽  
Ysidore Konan ◽  
...  
Keyword(s):  
Zea Mays ◽  
Study Design ◽  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Zea Mays L ◽  
Cote D’Ivoire ◽  
Constant Weight ◽  
Côte D'ivoire ◽  
Production Areas

Aims: This study aims to determine merchantability of maize produced and stocked as grains, epis and spathes of maize in five departments of Côte d’Ivoire. Study Design: A total of 375 samples were collected at rate of 75 samples by department (Botro, Korhogo, Katiola, Agniblékro and Bondoukou). Then, the received samples were sent to the laboratory in order to analyse their merchantability. Place and Duration of Study: The collection of samples was carried out on grains, epis and spathes maize from February 2013 to January 2014. Then, the analyzes were carried out at the Biochemistry and Food Sciences Laboratory of the Félix Houphouët-boigny University. Methodology: The humidity was determined by drying until constant weight when the losses and damages of grains have been quantified by counting and weighing. Results: The results show that for maize grains, humidity levels vary from 8.59±0.11% to 14.18±0.52%. Concerning epis of maize, humidity levels are between 9.85±0.23% to 13.02±0.32%. For maize spathes, humidity levels fluctuate between 11.16±0.29% to 14.17±0.32%. The damages varies from 5.01±2.64% to 19.35±2.00% for maize grains, 9.05±5.27% to 21.29±7.17% for epis and 17.95±1.13% for spathes. As regards weigh losses, proportions of grains, epis and spathes are between 1.53±1.17% and 5.10±0.97%, 2.43±1.70% and 6.54±1.79% and 2.76±1.18% and 5.11±2.65%, respectively. Conclusion: A significant variability from one department to another can be noticed at level of maize quality regardless the type of maize. The merchantability of maize seems to be tied to post-harvest treatments (drying), type of storage (epis, grains and spathes) and structure of storage.

scholarly journals Evaluation of Effective and Safe Extraction Method for Analysis of Polycyclic Aromatic Hydrocarbons in Kolanuts from Côte d’Ivoire

2020 ◽  
pp. 1-10
Author(s):  
Kouadio Kan Rodrigue ◽  
Biego Godi Henri ◽  
Nyamien Yves Bleouh ◽  
Ake Assi Yolande ◽  
Coulibaly Adama
Keyword(s):  
Cote D'ivoire ◽  
Analytical Method ◽  
Côte D’Ivoire ◽  
Distribution Channel ◽  
Correlation Coefficients ◽  
Cote D’Ivoire ◽  
Côte D'ivoire ◽  
Relative Standard ◽  
Polycyclic Aromatic ◽  
Significant Regression

Aims: The current study targets the achievement of a reliable process for the determination of PAH contents in kola nuts for better appreciation of the risks incurred from the consumption of such food products. Study Design: Kolanuts collected from two big storage centers were analyzed after the validation of the proposed analytical method. Place and Duration of Study: Central Laboratory for Food Hygiene and Agro-Industry, LANADA in Abidjan, Côte d’Ivoire, running 2018. Methodology: Two references were used for the validation of the analytical method, namely the French standard NF V 03-110 and the ISO directive ISO/DIS/15753 applicable in Liquid Chromatography. The PAH contents of some samples collected from different stores were then determined. Results: From the data, a significant regression chart was recorded for the PAH detection graphs. All the analysis exhibited good linearity with significant correlation coefficients (R²˃ 0.99). The relative standard deviations of the repeatability and reproducibility assays are below 3%, whereas standard additions of PAH are fully recovered, with percentages close to 100%. Conclusion: Using this analytical method, kola nuts contamination by PAH have been determined with satisfactory.This analytical method could help in ensuring effective sanitary control at different critical points of kola nut distribution channel for promoting a good management of the toxicity concerns in such products.

scholarly journals Process of Attack on Cashew Tree Branches by Diastocera trifasciata (Coleoptera: Cerambycidae) and the Relationship between These Attacks and the Phenological Stages in the Gbêkê Region (Central Côte d’Ivoire)

Insects ◽  
2020 ◽  
Vol 11 (8) ◽  
pp. 456
Author(s):  
San-Whouly M. Ouali-N’Goran ◽  
Ettien Narcice Akessé ◽  
Gniré Mariam Ouattara ◽  
Daouda Koné
Keyword(s):  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Control Method ◽  
Abiotic Factors ◽  
Growth Stages ◽  
Phenological Stages ◽  
Cote D’Ivoire ◽  
Average Temperature ◽  
Côte D'ivoire ◽  
Cashew Tree

Cerambycidae Diastocera trifasciata attacks were studied from October 2015 to September 2017 in three cashew tree orchards in the locality of Brobo in central Côte d’Ivoire. One hundred fifty-three (153) cashew trees, arranged on a diagonal from each orchard, were selected for sampling. The attacked plants and the branches cut per tree were counted every 15 days. Biotic parameters, namely phenological stages of trees, and abiotic factors, which are rainfall, relative humidity and average temperature, were recorded throughout the study. Attacks were observed from mid-September to January from the pre-flowering vegetative stage to the flowering stage. Attack period duration was therefore four and a half months per year. The peak of attacks was recorded in November with an attack rate of 88.02% in 2015 and 75.49% in 2016. No attack was recorded from February to mid-September, corresponding to the flowering, fruiting and post-harvest vegetative growth stages. This description of the attack process and the determination of D. trifasciata attack periods provides essential data for the implementation of an effective and sustainable control method of this species.

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