STUDY OF TREE-TO-TREE YIELD VARIABILITY AMONG SEEDLING-BASED CACAO POPULATIONS IN AN INDUSTRIAL PLANTATION IN CÔTE D'IVOIRE

2017 ◽  
Vol 54 (5) ◽  
pp. 719-730
Author(s):  
THOMAS WIBAUX ◽  
DANY-CLAUDE KONAN ◽  
DIDIER SNOECK ◽  
PATRICK JAGORET ◽  
PHILIPPE BASTIDE
Keyword(s):  
Cote D'ivoire ◽  
Environmental Conditions ◽  
Côte D’Ivoire ◽  
Cropping Systems ◽  
Significant Proportion ◽  
Limiting Factor ◽  
Cote D’Ivoire ◽  
Côte D'ivoire ◽  
Individual Trees ◽  
Cacao Tree

SUMMARYIn Côte d'Ivoire, the world's largest cocoa producer, cacao (Theobroma cacaoL.) is usually grown from seed. The genetics consist of a mix of amelonado, trinitario and selected hybrids. This mix of varieties generates high phenotypic variabilities, including variability in tree productivity, within cacao populations in both smallholder and industrial plantations. Tree-to-tree variability in yield has been reported in cacao breeding trials under different environmental conditions. However, it has never been considered a limiting factor for agronomical performance of seedling-based cacao plantations. Around 10 000 cacao trees from seven plots under different environmental conditions in a cacao plantation in Côte d'Ivoire were monitored for 2 years. Pod production of individual trees was recorded and annual average tree pod yields were assessed. High heterogeneity in cacao-tree yields was observed in all plots, with coefficients of variation ranging from 56 to 102%. The distribution of cacao-tree yields in each plot was positively skewed. Analysis of these distributions showed that unproductive trees represented a significant proportion of cacao tree populations (7%), and the 20% least productive trees accounted for 3% of production. The 20% most productive trees were responsible for 46% of the total pod production of a plot. This heterogeneity reflects a major imbalance in the agronomical performances of low- and high-yielding trees and also represents possible efficiency gaps in seedling-based cacao plantations, which could be overcome through innovative corrective strategies, opening new pathways for improvement of cacao-based cropping systems.

scholarly journals Identification of Agromorphological Determinants Favoring the Propagation of Bacterial Disease in Agroforestry Farms of Cashew Trees in Côte d'Ivoire

2021 ◽  
pp. 29-37
Author(s):  
Brou Kouassi Guy ◽  
Oro Zokou Franck ◽  
Doga Dabé ◽  
Leki Konan Bertrand ◽  
Kouassi Koffi II Nazaire ◽  
...  
Keyword(s):  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Cropping Systems ◽  
Descriptive Analysis ◽  
Hierarchical Classification ◽  
Agroforestry Systems ◽  
Bacterial Disease ◽  
Cote D’Ivoire ◽  
Côte D'ivoire ◽  
Ascending Hierarchical Classification

In Côte d'Ivoire, cashew cultivation faces several health obstacles. Among these problems, bacteriosis causes extensive damage to twigs, leaves and fruits, lowers the quality of crops and causes yield losses. The spread of this disease would be under the determination of the morphological characters of the cashew tree. The objective of this study is to search for agro-morphological determinants that influence the spread of bacteriosis in agroforestry systems in Côte d'Ivoire. To achieve this objective, 30 cashew trees spread across 26 agroforestry cashew orchards in the Korhogo, Sinématiali and Boundiali departments were chosen and geolocated. The study factor is the clone, consisting of 30 cashew genotypes, with 13 modalities. The collected data was subjected to descriptive analysis, correlation test, ACP and ascending hierarchical classification (CAH). The results obtained showed that the size and leaf areas and size of cashew trees are determinants that promote the spread of bacteriosis in these 30 cashew genotypes. Following this result, the ascending hierarchical classification (CAH) made it possible to screen the genotypes into three groups. These results should contribute to the agroecological management of bacteriosis, to enhance and intensify agroforestry cropping systems in Côte d'Ivoire.

scholarly journals Identified main fire hotspots and seasons in Côte d’Ivoire (West Africa) using MODIS fire data

2021 ◽  
Vol 117 (1/2) ◽  
Author(s):  
Tionhonkélé D. Soro ◽  
Moussa Koné ◽  
Aya B. N’Dri ◽  
Evelyne T. N’Datchoh
Keyword(s):  
West Africa ◽  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Significant Proportion ◽  
Temporal Variations ◽  
Fire Dynamics ◽  
Cote D’Ivoire ◽  
North East ◽  
Côte D'ivoire ◽  
Fire Activity

Biomass burning has become more frequent and widespread worldwide, with a significant proportion occurring in tropical Africa. Fire dynamics have been generally studied at global or regional scales. At local scale, however, fire impacts can be severe or catastrophic, suggesting local analyses are warranted. This study aimed to characterise the spatio-temporal variations of vegetation fires and identify the main fire hotspots in Côte d’Ivoire, a country of West Africa, one of the world’s burn centres. Using MODISderived fire data over a 10-year period (2007–2016), the number of fire days, active fires and fire density were assessed across the entire country. In the southern part dominated by forests, fire activity was low. Three main fire hotspots were identified between 2°30’–8°30’W and 7°00’–10°30’N in the North-West, North-East and Central areas all dominated by savannas. In these areas, Bafing, Bounkani and Hambol regions recorded the highest fire activity where fire density was 0.4±0.02, 0.28±0.02 and 0.18±0.01 fires/km²/year, respectively. At national scale, the annual fire period stretched from October to April with 91% of fires occurring between December and February, with a peak in January. Over the decade, there was a decreasing trend of fire activity. Fire density also was negatively correlated with rainfall >1000 mm for the synchronic analysis, whereas fire density was positively correlated with rainfall in the previous years. Results suggest that the positive relationship between the previous year’s rainfall and fire activity could operate on a cycle from 1 to 4 years.

scholarly journals Itineraires Therapeutiques Des Malades De L’ulcere De Buruli Et Difficultes De Prise En Charge Hospitaliere A Djekanou (Cote d’Ivoire)

2017 ◽  
Vol 13 (3) ◽  
pp. 197
Author(s):  
Adjet A. Abel
Keyword(s):  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Health Workers ◽  
Care Center ◽  
Significant Proportion ◽  
Public Health Problem ◽  
Prise En Charge ◽  
Cote D’Ivoire ◽  
Awareness Campaigns ◽  
Côte D'ivoire

Among the neglected tropical disease, Buruli ulcer (BU) is a real public health problem in Côte d'Ivoire. Facing this pathology, international and national institutions to combat advocate for people in endemic areas early detection and immediate use of support centers at the first signs. However, patients continue to attend late care centers with large ulcerative lesions. Therefore, healing requires a long-term hospitalization that requires medical and surgical treatment. The main objective of this study is to analyze the factors that change the therapeutic route of BU patients and constraints socio - economic issues related to their hospitalisation. This is a qualitative and quantitative study. We used the technique of reasoned choice. It covered 55 patients met at the Djekanou care center in the Toumodi Health District. Data were collected through structured and semi - structured interviews based on questionnaires, individual interview guides and focus groups. A significant proportion of patients with BU are children and adolescents. The sick are accompanied by a parent who takes care of them. Awareness campaigns, community health workers, television and radio did not really help to change the therapeutic itinerary of patients. The patients encountered testify to the ineffectiveness of traditional care. The hospitalization of patients is marked by difficulties of several kinds.

scholarly journals Phytosociological Surveys and Monitoring of the Bromatological Parameters According to the Age of Regrowth of Savannah Pastures Perfectly Reconstituted in the Central Zone of Côte d'Ivoire

2021 ◽  
pp. 54-61
Author(s):  
Gouagoua Séverin Kouadja ◽  
Adam Camille Kouamé ◽  
Kouakou Eugène Kouadio ◽  
Brou Jean Kouao ◽  
N’Gouan Cyrille Kouassi
Keyword(s):  
Nitrogen Content ◽  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Central Zone ◽  
Poor Quality ◽  
Point Of View ◽  
Limiting Factor ◽  
Cote D’Ivoire ◽  
Côte D'ivoire

Although pastures in central (Affouvansou) Côte d'Ivoire are abundant, signs of undernutrition are observed in the animals towards the end of wintering, possibly due to insufficient quality pastures, poor grass quality, or poor herd distribution. Using the in-vivo digestibility method, bromatological monitoring of the fodder from these pastures was carried out according to the development age of the regrowth using Djallonke sheep. The objective is to help in the judicious use of these pastures. At regrowth age intervals between the 4th and 8th week, the nitrogen content in the grass decreases, the energy value increases at 6 weeks, and decreases slightly to remain at a correct value in the following weeks. Due to its nitrogen value, this pasture can be classified as a more or less poor quality savannah fodder. However, the savannah studied is of excellent quality from an energy point of view at 5 - 6 weeks of regrowth age. Depending on the nitrogen value, the forage can be said to be of average quality from the 5th to the 7th week. Beyond 8 weeks, the forage is of poor quality. The nitrogen content is therefore a limiting factor here. It cannot meet the maintenance needs of the UBT. It, makes sense to use the pastures in the center of the country between the 6th and 7th week of regrowth to get the most out of it.

scholarly journals Relationship between the Intensity of Latex Harvesting and the Tapping Panel Dryness Expression of Clone GT 1 of Hevea brasiliensis Muell Arg in South-East Côte d'Ivoire

2021 ◽  
pp. 36-45
Author(s):  
Obouayeba Samuel ◽  
Konan Djezou ◽  
Diarrassouba Moussa ◽  
Lehi Malidy Irénné ◽  
Koffi Antoine ◽  
...  
Keyword(s):  
Cote D'ivoire ◽  
Hevea Brasiliensis ◽  
Côte D’Ivoire ◽  
Thiol Group ◽  
Limiting Factor ◽  
Eastern Region ◽  
Cote D’Ivoire ◽  
Rubber Production ◽  
Côte D'ivoire ◽  
Tapping Panel Dryness

Tapping panel dryness is an important limiting factor in rubber productivity of Hevea brasiliensis. In order to assess the sensitivity to this syndrome, the effect of two intensive latex harvesting technologies on moderately metabolized GT1 clone, has been studied in the South-Eastern region of Côte d'Ivoire. The rubber trees were planted according to the experimental mono-tree device, "One tree one plot design" a tree constituting a repetition, and 31 trees per treatment, selected on circumference and health status criteria. The parameters measured were rubber production, circumference increase, physiological profile and tapping panel dryness sensitivity. The results showed that induction of tapping panel dryness in latex harvesting system, S/2 d/3 6d/7 ET 10 % Pa 1 (1) 1/ w) was significantly low (0.18 ± 0,22 %) than that of the control (S d/1 6d/7 unstimulated, 1.43 ± 1.45 %). Productivity of this particular system was also good (62 ± 16.32 g.a-1.s-1) and it especially has less stress that can cause physiological fatigue, or even the notch dry. Otherwise, Rubber production, radial vegetative growth, physiological parameters of the latex and the tapping panel dryness rate were influenced by the two treatments applied to GT 1. In addition, the medium and high sucrose contents (16.5 ± 3.01%) and thiol group (0.51 ± 0.13 mmol.l-1) of the latex in the treatment (S/2 d/3 6d/7 ET 10% Pa 1 (1) 1 / w), were instrumental in the response to this stimulation. The sensitivity to the tapping panel dryness is in very close linear relation with the harvest intensity of the latex to which the GT 1 clone has been subjected. These results corroborate and confirm the moderate sensitivity to the tapping panel dryness of GT 1 clone.

scholarly journals Agromorphological Determinants Favoring the Spread of Anthracnose Disease in Cashew Agroforestry Farms in Côte d'Ivoire

2021 ◽  
pp. 50-60
Author(s):  
Brou Kouassi Guy ◽  
Silue Souleymane ◽  
Doga Dabé ◽  
Oro Zokou Franck ◽  
N’goran Yao Claude François ◽  
...  
Keyword(s):  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Cropping Systems ◽  
Descriptive Analysis ◽  
Agroforestry Systems ◽  
Cote D’Ivoire ◽  
Anthracnose Disease ◽  
Côte D'ivoire ◽  
Hierarchical Ascending Classification ◽  
Cashew Tree

Cashew cultivation faces several health problems. Among these problems, anthracnose causes extensive damage to twigs, leaves and fruits and causes loss of yield. The spread of this disease is thought to be determined by certain agromorphological features of the cashew tree. The objective of this study was to search for these agro-morphological determinants that influence the spread of anthracnose disease in agroforestry systems in Côte d'Ivoire. To achieve this objective, 30 cashew trees spread across 26 agroforestry cashew orchards in the Korhogo, Sinématiali and Boundiali departments were chosen and geolocated. The factor studied was the clone, consisting of 30 cashew genotypes, with 15 modalities. The collected data was subjected to descriptive analysis, correlation test, PCA and hierarchical ascending classification (CAH). The results showed that the wingspan, leaf area and size of cashew trees are determinants that promote the spread of anthracnose disease. Following this result, the CAH made it possible to screen the genotypes into three groups. These results could contribute to management of anthracnose disease in agroforestry, to enhance and intensify this cropping systems.

scholarly journals Attacks and damage of termites (Insecta: Isoptera) in different cocoa agroforestry systems (Nawa, Côte d’Ivoire).

2020 ◽  
Vol 44.1 ◽  
pp. 7567-7576
Author(s):  
SIB Ollo ◽  
SORO Senan ◽  
TRA BI Crolaud Sylvain
Keyword(s):  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Cropping Systems ◽  
Agroforestry Systems ◽  
Cote D’Ivoire ◽  
South West ◽  
Côte D'ivoire ◽  
Different Types ◽  
Cocoa Agroforestry ◽  
Intermediate System

To maintain its status of leading producer of cocoa in the world, Côte d'Ivoire must be contain the different types of threats, including the emergence of termites in cocoa farms. This study was conducted in the south-west of the country to evaluate the effect of cropping systems (full sun system, intermediate system and shaded system) on termite attacks. The study was conducted in four localities with different cocoa agroforestry systems. The sampling was made on cocoa trees in quadrats of 30mx30m and the attack rate was calculated. Eleven (11) termite species were identified. The wood-feeders groups were dominant. These termites were responsible for 41.82% of the damage on cocoa trees. Termite Attacks vary between different cropping systems. Full sun systems were most attacked comparing to intermediate shade systems that were least attacked by termites. This work shows that the shade system has an effect on termite attacks in cacao trees. The choice of right system can help to significantly reduce termite attacks in cocoa farms.

Sign in / Sign up

Export Citation Format

Share Document