This review examines how fatty acids and other compounds from algae and cyanobacteria can naturally fight Fusarium fungus, which damages crops like wheat, corn, and tomatoes. Traditional chemical fungicides harm the environment and can make fungi resistant, so scientists are exploring algae-based alternatives that work sustainably. The research shows these algal compounds can damage fungal cell membranes and boost plant defenses against infection. While promising, more work is needed to develop these natural solutions for practical farm use.