IN VITRO EFFICACY OF FIVE ESSENTIAL OILS ON THE MYCELIAL GROWTH OF ASPERGILLUS NIGER ISOLATES FROM ONION BULBS

Onion is a vegetable produced in practically all regions of Burkina Faso. Many efforts are being made to increase national production, but in storage, the loss due to black rot limits the disponibility of local bulbs during the year. The essential oils of Ocimum gratissimum, Ocimum basilicum, Cymbopogon citratus, Cymbopogon Gigantes, and Lippia multiflora, known to have antifungal properties, were added to a PDA medium and assessed in vitro at 500, 1000, 1500 and 2000 ppm concentrations on mycelial growth of isolates of Aspergillus niger. After the 4- and 7-day incubation, there was a highly significant difference between the essential oils at concentrations of 500 and 1000 ppm (p