Evaluation De L’efficacité De Fongicides Au Laboratoire Contre Corynespora Cassiicola, Agent Causal De La Maladie « Corynespora Leaf Fall » De L’hévéa En Côte d’Ivoire

Corynespora leaf fall disease (CLFD) caused by Corynespora cassiicola is increasingly a major problem for the development of rubber production in Côte d'Ivoire. In the search for solutions to this problem, the efficacy of 11 fungicides (Azoxystrobin, Carbendazime + Chlorothalonil, Carbendazime, Chlorothalonil, Difenoconazole, Fosetyl-Aluminum, Iprodione, Mancozeb, Metalaxyl + Copper Oxide, Pyraclostrobin + Fenpropimorph, Triadimefon) was laboratory tested against an isolate of C. cassiicola. The results of this test showed a high level of efficacy of four fungicides, Iprodione, Carbendazime + Chlorothalonil, Carbendazim and Pyraclostrobin + Fenpropimorph. The use of these four fungicides formulations in mature plantation would be well indicated, to overcome this foliar pathology.

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Quantitative Assessment of the Agro-physiological Advantages of Upward Tapping in Relation to the Downward Tapping of the GT 1 and PB 260 Rubber Clones [Hevea brasiliensis, Muell. arg. (Euphorbiaceae)] in Southwest Côte d'Ivoire

Journal of Experimental Agriculture International ◽

10.9734/jeai/2021/v43i230650 ◽

2021 ◽

pp. 94-104

Author(s):

A. P. Moro ◽

B. Y. C. Adou ◽

M. Diarrassouba ◽

D. Konan ◽

E. F. Soumahin ◽

...

Keyword(s):

Cote D'ivoire ◽

Hevea Brasiliensis ◽

Côte D’Ivoire ◽

Cote D’Ivoire ◽

Physiological Profile ◽

Rubber Production ◽

Côte D'ivoire ◽

Productivity Gain ◽

Harvesting Systems ◽

Tapping Panel Dryness

The downward tapping on virgin bark of the lower panel (BO) is immediately followed by the upward tapping on virgin bark of the upper panel (HO), consecutively. To determine the agro-physiological advantages of one tapping over another, a study of the downward and upward tapping of the GT 1 and PB 260 clones of Hevea brasiliensis was carried out in southwestern Côte d'Ivoire. For this purpose, the rubber trees were tapped in a downward half-spiral (S/2) at the opening for nine consecutive years, followed by upward quarter-spiral tapping (S/4U) for four consecutive years. The agronomic parameters (rubber production and vegetative growth), tapping panel dryness and the latex micro-diagnosis, were evaluated. For GT 1 clone, the transition from the downward tapping panels to the upward tapping panels resulted rubber productivity gain of 35%. Meanwhile for PB 260, rubber productivity gain was 37%. Regardless of the clone and tapping direction, the higher the rubber productivity of a respective tapping panel, the lower the isodiametric growth of the tree trunk was recorded. Latex harvesting systems, and clone’s combination, did not influence the tapping panel dryness or the physiological profile of the trees. Finally, it should be concluded that upward tapping is more productive than downward tapping, but the quantification of the gains in this rubber production depends on the clone.

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Contract farming, and the success of smallholders in rubber production in Côte d’Ivoire

Cahiers Agricultures ◽

10.1684/agr.2012.0575 ◽

2013 ◽

Vol 22 (1) ◽

pp. 46-52 ◽

Cited By ~ 4

Author(s):

François Ruf

Keyword(s):

Cote D'ivoire ◽

Côte D’Ivoire ◽

Contract Farming ◽

Cote D’Ivoire ◽

Rubber Production ◽

Côte D'ivoire

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Anatomie Et Histologie De L’hepatopancreas Chez Le Male Du Poisson Brachydeuterus Auritus (Haemulidae, Valenciennes, 1831) En Cote D’ivoire

European Scientific Journal ESJ ◽

10.19044/esj.2017.v13n24p289 ◽

2017 ◽

Vol 13 (24) ◽

pp. 289

Author(s):

Komenan Daouda Kouassi ◽

Marie-Anne D’Almeida ◽

Jean Jacques Miessan ◽

Silvain Yao ◽

Valentin N’Douba ◽

...

Keyword(s):

Cote D'ivoire ◽

Côte D’Ivoire ◽

Methodological Approach ◽

Pigment Cells ◽

Cote D’Ivoire ◽

Côte D'ivoire ◽

Liver And Pancreas ◽

High Level ◽

Biliary Tracts ◽

Homogeneous Tissue

Brachydeuterus auritus is a fish species with a high level of exploitation potential in Côte d'ivoire. The following study is based upon a maturity ladder and the discrimination of the hepatopancreas. The methodological approach consisted of a macroscopic description of the hepatopancreas according to the five stages of sexual maturity. The microscopic study consisted of fixing the hepatopancreas, dehydrating, impregnating, including it, making cuts that are colored for observation. At the macroscopic level, the hepatopancreas is made of two unequal lobes. The organ has a colouring as well as a vascularization varying in terms of the species development stages. At the microscopic level among the males, the hepatopancreas is a mixed organ made of the liver and the pancreas. The hepatopancreatic parenchyma is an homogeneous tissue made of hematocytes which are polygonal cells. In addition, we can find hematopoietic tissues in the parenchyma and melanomacrophages centers located near the blood vessels and the biliary tracts. The melanomacrophages centers are formed with cells accumulating pigment cells. Inside the organ, the pancreas is discriminated centripally and constituted of exocrine cells and Langerhans islets. The physiology of the two entities (liver and pancreas) will establish the organ's physiology. Hepatopancreas is involved in reproduction, digestion and defence. It exists as an organ that controls many functions and plays an important part in the physiology of fish in anabolism and catabolism.

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Anatomie Et Histologie De L’hépatopancréas Chez La Femelle Du Poisson, Chloroscombrus Chrysurusde Linnaeus, 1766 (Carangidae) En Côte d’Ivoire

European Scientific Journal ESJ ◽

10.19044/esj.2018.v14n18p403 ◽

2018 ◽

Vol 14 (18) ◽

pp. 403

Author(s):

Jean-Jacques Miessan ◽

Marie-Anne D’almeida ◽

Komenan Daouda Kouassi ◽

Sylvain Yao ◽

Valentin N’douba ◽

...

Keyword(s):

Cote D'ivoire ◽

Sexual Maturity ◽

Côte D’Ivoire ◽

Methodological Approach ◽

Female Gender ◽

Hepatic Parenchyma ◽

Cote D’Ivoire ◽

Côte D'ivoire ◽

The Right ◽

High Level

Chloroscombrus chrysurus is a pelagic fish species that belongs to the Carangidae family. It has a fairly high level of exploitation in Côte d'Ivoire. This paper focuses on the study of the maturity scale, the differentiation, and the histology of hepatopancreas. The methodological approach consisted of a macroscopic description of the hepatopancreas according to the six stages of sexual maturity. The microscopic study consisted of fixing the hepatopancreas, dehydrating them, impregnating them, including them, and making the sections that will be stained for optical microscopic observation. Macroscopic analysis has established six stages of sexual maturity in the species during which the growth and differentiation of hepatopancreas occur. From the juvenile to the adult stage, the size and color of the hepatopancreas vary. On the other hand, its aspect and shape remain unchanged. The hepatopancreas consists of two unequal lobes. The left hepatic lobe is always more developed than the right. On the microscopical level, among the female gender, the hepatopancreas is a mixed organ which constituted the hepatic parenchyme and pancreas. The pancreas differs in the hepatic parenchyma which is composed mainly of polygonal hepatocytes and blood vessels. The hepatocytes are arranged in sinusoidal cords around the capillaries. The pancreas is composed of islets of Langerhans (endocrine pancreas) and serous acini Pancreatic (exocrine pancreas). Both structures progressively invade the hepatic parenchyma. The hepatopancreas is an essential organ in the physiology of fish.

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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

Journal of Advances in Biology & Biotechnology ◽

10.9734/jabb/2021/v24i530216 ◽

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.

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The diversity and conservation of mammals in the Dodo Coastal Forest in southwestern Côte d’Ivoire, western Africa: a preliminary study

Journal of Threatened Taxa ◽

10.11609/jott.4641.11.6.13654-13666 ◽

2019 ◽

Vol 11 (6) ◽

pp. 13654-13666

Author(s):

Serge Pacome Keagnon Soiret ◽

Célestin Yao Kouakou ◽

Béné Jean-Claude Koffi ◽

Blaise Kadjo ◽

Philippe Kouassi ◽

...

Keyword(s):

Cote D'ivoire ◽

Côte D’Ivoire ◽

Surveillance Program ◽

African Buffalo ◽

Coastal Forest ◽

Cote D’Ivoire ◽

Western Africa ◽

Remote Cameras ◽

Côte D'ivoire ◽

High Level

To improve the knowledge of non-volant mammal diversity and conservation prospects in the Dodo Coastal Forest (DCF) in southwestern Côte d’Ivoire, we conducted reconnaissance surveys and interviews, and deployed remote cameras. We calculated visual encounter rates (vER) and sign ER (sER) of mammalian taxa and hunting signs, mapped their locations and tested the hypothesis that sightings and signs of primates occurred closer to the river Dodo in and near the gallery forest. We sighted nine taxa, including threatened King Colobus (Endangered, EN), Olive Colobus (Vulnerable, VU), Lowe’s Monkey (VU), the Eastern Lesser Spot-nosed Monkey (VU), and White-bellied Pangolin (VU), with vER of 0.04, 0.12, 0.04, 0.12, 0.04, respectively. We confirmed 14 other taxa with signs including threatened Western Chimpanzee (CR), Pygmy Hippopotamus (Endangered, EN), Bosman’s Potto (VU), and Black-bellied Pangolin (VU), with sER of 0.51, 0.04, 0.08, 0.04, respectively. The most frequently encountered signs were of the Red River Hog at 1.73 signs/km, and the Bushbuck at 0.63 signs/km. Remote cameras captured images of these two taxa at image capture rates (ICR) of 0.044 and 0.022, respectively. Images of the African Buffalo were captured at ICR of 0.044. The 23 confirmed taxa include seven primates, four rodents, three carnivores, six even-toed ungulates, two pangolins and a Tree Hyrax. The mean distance from the river Dodo to the sightings and the signs of the primates was significantly shorter than that of other taxa. This supports our hypothesis. There was a high level of hunting signs (sER = 0.63) indicating that intensive hunting pressure is menacing the fauna. We recommend that authorities take actions against poaching, install a surveillance program, and curtail charcoal-making to ensure the conservation of the threatened mammals of the DCF.

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