EFFECTIVE OF SOME PLANT WATER EXTRACTS AGAINST THE GROWTH OF Aspergellus niger FUNGUS THAT CAUSES BLACK ROT IN ONIONS IN VIVO

Abstract

The experiment was carried out in the Microbiology Department laboratory- Supreme Board of Drugs and Medical Appliances- Aden/ Yemen during the period July February, March and April 2023. To find out the effectiveness of four concentrations of water extracts of Nerium oleander leaves, 5, 10, 15, and 20%, on the fungus Aspergillus niger, the Nerium oleander leaf extract with a concentration of 20% was the most effective. In a control, the fungus colony growth diameter reached 90 mm after 7 days of incubation. In another experiment, testing the effect of water extracts of Mentha longifolia leaves on the same fungus at the same concentrations (5, 10, 15, 20%). At the highest effective concentration of 20%, the fungus colony growth diameter did not exceed 38 mm, and the percentage of inhibition reached 57.7% compared to the control, in which the fungus colony growth diameter reached 90 mm after 7 days of incubation.