Researcher: Canola Oil Kills Grasshoppers (AP) AP - Raw canola oil can combine with a fungus to get rid of grasshoppers, a researcher says. Stefan Jaronski, who works at the Agricultural Research Service in Sidney, Mont., has found that the raw canola oil has fatty acids that will attract grasshoppers to deadly fungi known as Beauveria bassiana and Metarhizium anisopliae.