Abstract
The study was conducted to examine the effect of the aqueous extract of Eucalyptus leaves on the growth of Aspergillus niger using three different concentrations 20%, 50%, and 80%. The study results showed that the aqueous extract of Eucalyptus leaves had an inhibitory effect on the fungus, with the inhibition percentages being 11.11% at 20%, 22.00% at 50%, and the highest inhibition of 77.78% at 80% concentration.