To protect tree nuts and corn plants that are affected by "A. flavus" treating the plants with the yeast "Pichia anomala" reduces the growth of "A. flavus". Treating pistachio trees with "P. anomala" inhibited the growth of "A. flavus" up to 97% when compared to untreated trees. The yeast successfully competes with "A. flavus" for space and nutrients, ultimately limiting the growth of "A. flavus".