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Articles by Abo Kouabenan
Total Records ( 6 ) for Abo Kouabenan
  Affery Arthur Martin , Abo Kouabenan , Wonni Issa , Tuo Seydou , Kassi Fernand Martial , Camara Brahima and Kone Daouda
  Background and Objective: Cassava (Manihot esculenta Crantz) is an important crop in intertropical areas. However, it is subject to many diseases, among them the bacterial blight caused by Xanthomonas axonopodis pv. manihotis. The objective of this study was to assess the behavior of two varieties of cassava, including a traditional one (Diarrassouba) and an improved one (Bocou 1) in the area of Ferkessédougou endemic to bacterial blight and on the other hand, to test the bactericidal activity of NECO, a biological product made of essential oil extracted from Ocimum gratissimum. Materials and Methods: Eight increasing concentrations of NECO in comparison with the reference Callicuivre were used to assess the in vitro antibacterial activity and the 5 mL L–1 NECO dose was used in situ. Data were analyzed with one way ANOVA and Statistica software. Results: The results show that NECO exhibits bacterial inhibitory activity with diameters ranging from 0.34-3.46 cm. In situ, the use of NECO at 5 mL L–1 dose significantly decreases bacterial blight in the range of 74.94-59.35%, depending on the crop season. Conclusion: NECO could, therefore, be used as an alternative to synthetic products in cassava bacterial blight control.
  Ehui Kouadio Jean Nestor , Bolou Bi Antoine , Amari Ler-N`Ogn Dade Georges Elisee , Affery Arthur Martin , ABO Kouabenan and Kone Daouda
  Background and Objective: Distribution, incidence and severity of cassava anthracnose interact with environmental factors and threaten cassava cultivation in Côte d'Ivoire. Current study was aimed at analyzing physiological parameters of plants, climate variability and their interaction in response to cassava anthracnose disease during crop cycle. Materials and Methods: Study focused on the establishment of experimental plots during two agricultural season (2016-2018), according to Fisher block design with eight genotypes. Observations occurred at 1 and every 2 months after planting to assess incidence and severity. Temperature (°C), relative humidity and dew point data were collected. Data were analyzed with variance ANOVA (two way) of Statistica 7.1 software with p<0.05. Results: Cassava genotypes Bocou2 (improved) and Diarrassouba (local) were resistant and tolerant with means incidences 0 and 4.02% for means severity indexes of 0 and 0.5, respectively. All over 6 genotypes have been sensitive. Cassava genotypes phenological stages of tuberization (incidence = 14.70, severity index = 0.9) and maturation (incidence = 25.13%, severity index = 1.8) were most severely infested. Mean temperature, relative humidity and dew point variations of 8.4°C, 26% and 7.4°C, respectively, led to outbreak of first symptoms at tuberization stage. Rising temperatures and dew point levels are correlated to heavy infestation and severe deterioration of infected organs. Conclusion: Cassava genotypes behavior differs in response to anthracnose disease at tuberization and maturation stages. Physiological modifications occurred at tuberization stage conducted to infestations of sensitive genotypes. Rising temperature, relative humidity and dew point variations could support severe outbreak of cassava anthracnose disease.
  Tuo Seydou , Amari Ler-N`ogn Dade Georges Elisee , Camara Brahima , Soro Sibirina , Sorho Fatogoma , Abo Kouabenan , Ouedraogo Somgnogdin Leonard and Kone Daouda
  Background and Objective: An assessment trial on the behavior of five varieties of banana and plantain cultivars under natural infestation by Mycosphaerella fijiensis was carried out in Azaguié-Ahoua in Southern Côte d’Ivoire, in 2013 and repeated in 2014 for selecting varieties that are productive and tolerant to Black Sigatoka (BLSD). Methodology: The trial was set up in split-plot with three repetitions. The banana tree suckers were planted, with a density of 1,600 plants per hectare, that is a spacing of 2.5 and over 2.5 m. In the 4th month after planting, observations and measurements focused on agronomic and phytopathological descriptors so as to assess yield components and sensitivity of the varieties to BLSD. Results: The results indicated that hybrids PITA 3 and FHIA 21 introduced were the most tolerant and productive and the local cultivar "Orishele", the most sensitive and least productive. These hybrids PITA 3 and FHIA 21 presented respective gross yields of 18.50 and 21.22 t ha–1 in the first crop cycle and 10.62 and 14.98 t ha–1 in the second crop cycle with a high tolerance to BLSD. Whereas, the local cultivar "Orishele" presented a gross yield of 11.49 and 5.63 t ha–1 in the first and second crop cycle, respectively with a high sensitivity to BLSD. Conclusion: In order to improve the performance of the local cultivar "Orishele" appreciated by consumers it seems appropriate to continue research in an agronomic approach focusing on its cultivation in combination with tolerant hybrids for an integrated management of Black Sigatoka.
  Affery Arthur Martin, , Abo Kouabenan , Tuo Seydou , N`Zue Boni and Kone Daouda
  Background and Objective: Cassava (Manihot esculenta Crantz) is the second largest food crop in Côte d’Ivoire after yam. It is cultivated for its fleshy roots rich in starch and for the richness of its leaves in minerals (calcium, phosphorus and iron). However, this crop is subject to numerous biotic constraints of which one of the most formidable is bacterial blight caused by Xanthomonas axonopodis pv. manihotis. In Côte d’Ivoire, no concrete study has been conducted on this emerging disease with the aim of reducing its impact on the yield of tuberous roots of traditional and improved varieties. The objective of this study is to study the distribution of bacterial blight on the one hand and to assess the sensitivity of 8 varieties through an epidemiological study in two agro-ecological zones of Côte d’Ivoire on the other hand. Materials and Methods: Survey missions conducted in 2013 and 2014 have helped establish the health map of the different cassava production zones, followed by an epidemiological study of the disease with 8 cassava varieties of which four are improved, in two cassava production zones (Yamoussoukro and Ferkessedougou). Results: The results showed that bacterial blight was observed in all agro-ecological zones with an incidence ranging from 2.17-66.67%. As for the epidemiological study, it showed a contrast between the two areas of study. The severity of the disease was very low in the dry season (December-March) corresponding to the 7th until the 10th month of this study. Moreover, the rainy season contributed to an expansion of the disease. Diarrassouba and Yace (traditional varieties) and Bocou 1 (improved variety) were the most susceptible to the disease. Conclusion: A fight against this disease must be envisaged before it spreads to all cassava cultivation zones in Côte d’Ivoire.
  Silue Nakpalo , Soro Sibirina , Kone Tchoa , Abo Kouabenan , Kone Mongomake and Kone Daouda
  Background and Objective: Cashew tree (Anacardium occidentale L.) is an important fruit tree mainly culture for the edible nuts providing substantial income to farmers in northern and central regions of Côte d’Ivoire. However, the productivity is threatened by the strategies development and extension of diseases. Therefore, this study aimed to identify pathogens involved in cashew diseases. Materials and Methods: Leaf, shoot tip, twig, flower and fruit samples were collected in the most important cashew-growing areas of Côte d’Ivoire. Sections of 4-6 mm diameter from the periphery of lesions where surface sterilized in 70% ethanol and then in 3% sodium hypochlorite followed by abundant rinsing in sterile distilled water. After removing excess of water, fragments were placed on PDA medium. Symptoms associated with the pathogens in the field were described. To test the pathogenicity of isolates obtained, leaves of twenty eight days seedlings were sprayed with a spore concentration of 106 mL–1 used as inoculum for each isolate. Data collected were analyzed using analysis of variance (ANOVA 1) with Statistica version 7.1 software. Results: The results revealed that the different pathogenic diseases of cashew in Côte d’Ivoire are caused by Colletotrichum gloeosporioides (63.45%), Pestalotia heterocornis (30.35%), Lasiodiplodia theobromae (1.66%) and other unidentified pathogens. Pathogenicity of isolates was verified by the implementation of Koch’s postulate. Conclusion: This study confirmed the presence of pathogenic fungi on cashew and the fact that some of these fungi can induce symptoms reducing leaf photosynthetic area and the production capacity. Based on pathogenic characterization of fungi, strategies need to be developed in order to identify fungi species and integrated disease management approaches.
  Ouattara Brahima , Abo Kouabenan , Tuo Seydou , Bolou Bi Bolou Antoine , Cherif Mamadou and Kone Daouda
  Background and Objective: Tomato (Solanum lycopersicum L.) domestic production is largely below requirements in Côte d'Ivoire because of numerous abiotic and biotic constraints, especially sclerotinia caused by Sclerotium rolfsii. The present study was initiated to test the antifungal activity of a complex consisting of propagules of 6 different species of arbuscular mycorrhizal fungi (AMF) on S. rolfsii. Materials and Methods: Inoculations with S. rolfsii sclerotia were performed. Green house tomato plants of the 45 day old Lindo F1 variety were transplanted into pots of 297 cm3 volume. The impact of inoculation was assessed at planting and at the end of the experiment on plant height growth, collar diameter, number of functional leaves and number of flowers. Results: The results revealed that the mycorrhization of nursery plants with the CMAs used has antifungal action on S. rolfsii. Mycorrhization had a beneficial effect on growth, especially in the early phase, when mycorrhizal plants appeared to be better developed than non-mycorrhizal plants. The incidence of dry rot in non-mycorrhizal plants is 2.5 times higher than the incidence of mycorrhizal plants. Conclusion: Mycorrhization may be advisable for growers in tomato growing areas where sclerotinia is more prevalent as an alternative to the over use of synthetic fungicides.
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