فعالية بعض المستخلصات المائية النباتية ضد نمو فطر Aspergellus niger المسبب لمرض العفن الأسود في محصول البصل (Allium cepa) في المختبر

Abstract

The experiment was carried out in the Microbiology Department laboratory- Supreme Board of Drugs and Medical Appliances- Aden/ Yemen  during the period February-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 Azadirachta indica  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 57 mm, and the percentage of inhibition reached 36.6% compared to the control, in which the fungus colony growth diameter reached 90 mm after 7 days of incubation.