Efficacy of aromatic plant and two fungicides on fungi causing onion bulb rot in burkina faso

This study is focus on research for solutions to fungal diseases involved in the bulb rot in the field. In all, seven fungal species including Fusarium solani, Fusarium oxysporum, Aspergillus niger, Aspergillus flavus, Alternaria porri, Acremonium strictum and Rhizopus stoloniferhave been isolated from rotten onion bulbs. Two conventional fungicides and a botanical extract have been tested dominant fungi such asFusarium solani, Fusarium oxysporum, Aspergillus niger, and Aspergillus flavus. The results revealed antifungal effects of both fungicides and botanical extract on mycelial growth. Thiophanate methyl has completely inhibited the mycelial growth of Fusarium solani, Aspergillus niger and A. flavus. Mancozèb induced 100% efficacy rate on F. solani and A. niger; 92.71% and 61.88% respectively on F. oxysporum and A. flavus. In contrast to fungicides, essential oil of L. multiflora at 0.1% was moderately reduced the mycelial growth of most fungi, showing a partial antifungal activity. Efficacy of essential oil of L. multiflora was 65.96 and 56.59% respectively for A. flavus and F. oxysporum; 45.32 and 43.66% respectively for A. niger and F. solani. Thiophanate methyl had fungicidal activity on A. niger, mancozèb used having a fungi static effect.