scholarly journals Evolution of the Rate of Live and Tapped Trees of Hevea brasiliensis Clones, Muell. Arg. the First 15 Years of Plantation Establishment

2021 ◽  
pp. 174-187
Author(s):  
Diarrassouba Moussa ◽  
Soumahin Eric Francis ◽  
Konan Djézou ◽  
Kouakou N’ Guessan Kan Pulchérie ◽  
Moro Affia Perpetue ◽  
...  
Keyword(s):  
Experimental Design ◽  
Metabolic Activity ◽  
Cote D'ivoire ◽  
Hevea Brasiliensis ◽  
Côte D’Ivoire ◽  
Block Design ◽  
Plantation Establishment ◽  
Cote D’Ivoire ◽  
Activity Class ◽  
Factors Influencing

The density of tapped rubber trees in a plantation is a determining parameter of its productivity. It is related to the number of trees planted per hectare, the evolution of which can be influenced by several factors that act on the trees from the year of establishment to the time of tapping. To this end, a study to determine the evolution of the rate of live trees and tapped trees of eight rubber clones during the first fifteen years of establishment was carried out in southwestern Côte d'Ivoire. At opening, rubber trees planted at 510 trees/ha (7 m x 2.80 m) were bled in a descending half-spiral at different tapping and stimulation frequencies. The experimental design was a Fisher block design with 6 treatments (d2, d3/4y, d4/4y, d4/8y, d5/8y, d6/10y) and 3 replications. The results revealed that the rate of live trees and tapped trees was not influenced by either clone or latex harvesting treatment. The rate of live trees decreased progressively from the immature phase of the plantation (94.71 ± 1.34%) to the end of the downward tapping (91.55 ± 0.67%). The rate of tapped trees increases from the time of planting (69.51 ± 8.03%), over the years (92.00 ± 1.39%) until it equals the rate of live trees (92.00 ± 1.08%) before gradually decreasing to 88 ± 3.78%. It should be noted that the factors influencing the evolution of the rates of live and taped trees caused less damage to the rubber trees. And this influence is not dependent on clone, metabolic activity class and latex harvesting system.

scholarly journals Effect of design and planting density on the agrophysiological parameters of clone GT 1 Hevea brasiliensis Muell Arg in southwestern Côte d'Ivoire

2019 ◽  
Vol 133 (1) ◽  
pp. 13516
Author(s):  
Kouadio Espérence Ballo ◽  
Francis Eric Soumahin ◽  
Jean Lopez Essehi ◽  
Justin Yatty Kouadio ◽  
Samuel Obouayeba
Keyword(s):  
Cote D'ivoire ◽  
Hevea Brasiliensis ◽  
Côte D’Ivoire ◽  
Planting Density ◽  
Cote D’Ivoire ◽  
Côte D'ivoire

scholarly journals Effect of Late Upward Tapping on the Productivity of the Metabolically Active Hevea brasiliensis Clone PB 260 in Southwestern Cote d'Ivoire

2021 ◽  
pp. 107-117
Author(s):  
Kouakou N’guessan Kan Pulchérie ◽  
Moro Affia Perpetue ◽  
Diarrassouba Moussa ◽  
Lehi Irénée Malydie ◽  
Konan Djézou ◽  
...  
Keyword(s):  
Cote D'ivoire ◽  
Hevea Brasiliensis ◽  
Vegetative Growth ◽  
Côte D’Ivoire ◽  
Block Design ◽  
High Yield ◽  
Physiological Profile ◽  
Rubber Production ◽  
Set Up ◽  
Société Civile

In order to evaluate the improvement of rubber productivity of rubber trees by late upward tapping. A study was conducted at SCASO (Société Civile Agricole du Sud-Ouest) on the PB 260 clone of the active metabolic class. The experimental set-up is a Fisher block design with eight treatments and three replications. The treatments compared were bled in reverse in the eleventh year of harvest, in quarter spiral every 3, 4, 5 and 6 days, with stimulation frequencies of 6, 8, 10, 12 and 13 times a year. The parameters measured were rubber production, isodiametric growth, sensitivity to dry notching of trees and physiological profile. The results show that the different latex harvesting technologies improve the rubber productivity of PB 260 (5469 kg.ha-1.yr-1) with a low dry-nut rate (1.2%) and satisfactory radial vegetative growth (3.9cm.yr-1). The physiological profile of the trees is balanced, but the treatments significantly influenced the different parameters except sucrose. Trees bled in S/4U d3 gave better results due to their high yield with an acceptable dry notch rate. Late reverse tapping is therefore a good latex harvesting technology for improving rubber productivity after down tapping.

scholarly journals Factors Influencing the Transborder Transmission of Brucellosis in Cattle Between Côte d'Ivoire and Mali: Evidence From Literature and Current Key Stakeholders

2021 ◽  
Vol 8 ◽  
Author(s):  
Wilfried Délé Oyetola ◽  
Kanny Diallo ◽  
Katharina Kreppel ◽  
Philippe Soumahoro Kone ◽  
Esther Schelling ◽  
...  
Keyword(s):  
Cote D'ivoire ◽  
Côte D’Ivoire ◽  
Control Strategies ◽  
Regional Scale ◽  
Small Ruminants ◽  
Border Control ◽  
Cote D’Ivoire ◽  
Factors Influencing ◽  
Côte D'ivoire ◽  
Key Stakeholders

Brucellosis is one of the main zoonoses affecting ruminants. Cattle and small ruminants are involved in transhumance and trade between Côte d'Ivoire and Mali. The endemic nature of the disease in both countries, connected through transhumance, poses unique challenges and requires more information to facilitate disease surveillance and the development of integrated control strategies. This study aimed to assess the main factors influencing the historical and current transborder transmission of brucellosis between Côte d'Ivoire and Mali. A literature review was conducted and data collection was performed through a participatory, transdisciplinary process by holding focus group discussions and interviews with key stakeholders. Cattle breeders, herdsmen, professionals of animal and human health, border control agents and experts took part. The data was analyzed to generate essential new knowledge for transborder brucellosis transmission factors and control strategies. From the literature, the seroprevalence of brucellosis in both countries varied from 11% (1987) to 20% (2013) and 15% (1972–1973) to 5% (2012–2014) in Mali and Côte d'Ivoire, respectively. The reduction of seroprevalence in Côte d'Ivoire was the result of the annual vaccination campaigns which lowered it from 28% (1978) to 14% (1984) after an increase due to livestock policy implemented in 1976. The meta-analysis and interviews jointly showed that the cross-border mobility was associated with the livestock development policy in Côte d'Ivoire as well as the ECOWAS act on the free movement of people and goods. This act supported the seasonal transhumance of livestock for access to pasture land in southern humid zones in Côte d'Ivoire. The seasonal mobility for grazing and trade was the main risk factor for the spread of brucellosis between pastoral zones of both countries. The existing legal health framework and border control mechanism do not achieve transborder surveillance to control brucellosis. Existing sanitary regulations should be adapted at regional scale to integrate a joint surveillance of high priority zoonotic diseases like brucellosis at border controls.

Multiplication industrielle par bouturage de clones matures d' Hevea brasiliensis

2013 ◽  
Vol 317 (317) ◽  
pp. 51 ◽  
Author(s):  
Aurélien Masson ◽  
Jean-Marc Julien ◽  
Luc Boedt
Keyword(s):  
Cote D'ivoire ◽  
Hevea Brasiliensis ◽  
Côte D’Ivoire ◽  
Grand Nombre ◽  
Cote D’Ivoire ◽  
Cette Situation ◽  
Côte D'ivoire ◽  
Conditions De Travail

L'importance de l'hévéa (caoutchouc), Hevea brasiliensis, en tant que culture de rente ne cesse d'augmenter justifiant de s'intéresser à de nouvelles techniques de clonage plus efficaces que le greffage (écussonnage) traditionnellement utilisé pour la production industrielle de matériel de plantation de qualité supérieure. Les bonnes performances sur le terrain (croissance rapide, haut rendement) des hévéas produits par embryogenèse somatique n'ont été constatées jusqu'à présent qu'à l'échelle expérimentale. La propagation de masse in vitro par embryogenèse somatique ou microbouturage de clones d'hévéas sur leurs propres racines reste pénalisée par un manque de réactivité de la plupart des génotypes sélectionnés et par des coûts de production prohibitifs. Face à cette situation, la propagation par bouturage de clones matures sélectionnés issus de micropropagation in vitro a été tentée par la SoGB en Côte d'Ivoire comme une alternative possible à l'utilisation exclusive des techniques in vitro. Les deux clones matures industriels, A (70 ans) et B (53 ans), ont d'abord été rajeunis in vitro par embryogenèse somatique puis micropropagés en plus grand nombre par microbouturage. Après acclimatation, les microboutures enracinées in vitro ont été rempotées dans des pots individuels pour être gérées de manière intensive comme pieds-mères destinés au bouturage. Après 3 semaines en conditions horticoles adéquates, les taux d'enracinement obtenus pour les boutures des clones A et B ont été respectivement de 74,6 % (1203/1613) et 76,5 % (198/259). Les racines adventices néoformées étaient généralement vigoureuses. A l'issue d'une phase d'acclimatation réussie, les boutures se sont développées de façon conforme pour atteindre 4 mois plus tard une hauteur de 25-30 cm suffisante pour être plantées au champ. En sus d'une plus grande vigueur et conformité sur le terrain, les clones issus de bouturage peuvent être produits plus rapidement, sur des surfaces plus réduites à moindre coût et dans des conditions de travail plus faciles par rapport aux plantes issus d'écussonnage. Des analyses en cours devraient permettre d'établir les avantages comparatifs des boutures par rapport aux plants écussonnés en ce qui concerne d'autres caractères à fort impact économique tels que le rendement de latex.

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