Identification of Fusarium Species Associated with Onion (<i>Allium cepa</i> L.) Plants in Field in Burkina Faso
- 1 Laboratoire de Phytopathologie Institute de l’Environnement et de Recherches Agricoles (INERA), Ouagadougou, Burkina Faso
- 2 Laboratoire de Phytopathologie Institute de l’Environnement et de Recherches Agricoles (INERA), Ouagadougou, Burkina Faso
- 3 Laboratoire de Phytopathologie Institute de l’Environnement et de Recherches Agricoles (INERA), Ouagadougou, Burkina Faso
- 4 Université Joseph Ki-ZERBO, Ouagadougou, Burkina Faso
- 5 Laboratoire de Phytopathologie Institute de l’Environnement et de Recherches Agricoles (INERA), Ouagadougou, Burkina Faso
Abstract
Many fungi limit onion production in Burkina Faso. This study aims to identify the main Fusarium species associated with onion plant in field in order to determine those involved in seed l ing damping-off and bulb rot, and develop adequate management strategies of these diseases. For this purpose, 36 isolates of Fusarium were isolated from onion plants in 17 sites and subjected to molecular analysis and biometric characterization. The results revealed that the i solates belong to five Fusarium species: Fusarium oxysporum (44.44% of t he isolates), Fusarium proliferatum (41.66%), Fusarium solani (5.55%), Fu sarium fujikuroi (5.55%) and Fusarium thapsinum (2.77%). Fus arium oxysporum , F . proliferatum , F . solani and F . fujikuroi had faster mycelial development, with a growth rate of 7.72 - 8.27 mm/d, than F . thapsinum (6.52 mm/d). Conidia of F . oxysporum , F . proliferatum and F . solani were longer (4.74 - 5.96 μm) than those of F . fujikuroi and F . thapsinum (3.20 - 4.04 μm). Fusarium solani and F . oxysporum , respectively, had the largest and most partitioned conidia.
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