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The diversity of culturable bacterial and fungal communities was assessed from leaves, trunk and rhizosphere of coconut palms infected and non-infected by the Côte d'Ivoire lethal yellowing (CILY) phytoplasma. Bacterial and fungal microbes were isolated from leaves, trunk and rhizosphere samples collected from two villages of Grand-Lahou, Braffedon and Yaokro, by using a high-throughput 'dilution-to-extinction' cultivation method coupled with PCR and sequencing with primers that amplified both the 16S ribosomal RNA and intergenic transcribed spacer (ITS) genes. The relative abundance was higher for Bacillus and Candida in Braffedon, and Burkholderia and Neodeightonia in Yaokro. Commonly genera identified from rhizosphere included Bacillus, Burkholderia, Pseudomonas, Streptomyces, Cryptococcus, Penicillium, Purpureocillium and Trichoderma. The most abundant endophytes identified were Pantoea, Candida, Cryptococcus, Bacillus, Pseudomonas, Penicillium, Aspergillus and Rhodotorula. Genera limited to symptomless palms included Arthrininum, Chaetomium, Phialemonium, Fusarium, Klebsiella and Candida. Results indicate that the CILY phytoplasma may be a factor determining the level of diversity of a microbial community in a given location. Our research provides the basis to investigate the possible effect of endophytic and rhizosphere microbes against the CILY phytoplasma to further effectively improve the management of CILY in Grand-Lahou.

This study aims to characterize the climatic variability in the South-East of Ivory Coast and to show its impact on the supply of water resources. To do this, statistical and hydrological methods were applied to climatic data collected at the Marc DELORME Research Station of the CNRA. The statistical trend tests on this data revealed a significant decrease in precipitation and an increase in temperature, insolation and evaporation. Statistical break methods indicate a rainfall break in 1982 which marks a modification of the rainfall regime thus translating a drop in rainfall of 15%, a recession in the frequency of rainy days in general and in particular in rainfall heights between 10 and 30 mm and greater than 50 mm.

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Objective: The objective of this study was to assess the fertilizing properties of two organic fertilizers (chicken droppings and coprah meal) on the growth parameters of the plantain banana tree (Musa paradisiaca) grown on quaternary sands of the Ivorian coast. Methodology and results: The study was conducted at the Marc Delorme research station of the National Centre for Agronomic Research (CNRA) in southern Côte d'Ivoire on the quaternary sands of the Ivorian coast with the PITA 3 variety of plantain banana tree with chicken droppings and coprah meal. The test was conducted using an experimental device in randomized random blocks with three replicates. Banana tree plants of PITA 3 have been subjected to eight treatments for ten weeks with three chicken dung treatments: T2 (500g/plant), T3 (750g/plant) and T4 (1000g/plant), three coprah meal treatments: T5 (500g/plant), T6 (750g/plant) and T7 (1000g/plant) and a control treatment (without fertilizers). Observations included collar circumference, banana plant size, leaf surface and mean number of live leaves. The results obtained showed that on the quaternary sands of the Ivorian coast, banana plants treated with 750 g/plant of chicken droppings or coprah meal have generated the best growth. However, chicken dung at the 750 g/plant dose yielded the best mean values of plant height (58.24+9.26), collar circumference (17.119 + 2.77), foliar surface (1534.452 cm2) and living leaves (9.16 + 1.46) during the study. Conclusion and application: Soil fertilization in plantain banana cultivation can be adequately ensured in coastal sandy soils by fertilization based on chicken droppings that are relatively accessible to producers with generally very low economic incomes, at a dose of 750 g/plant to ensure the proper growth of plants for a successful, sustainable plantain cultivation that respects the environment. However, in the absence of chicken droppings, the coprah meal also at the dose of 750 g/plant, could be an alternative for fertilization of soils in plantain banana tree culture on the quaternary sands of the Ivorian coast.