Forest Island Isla Manechi (left) in the Barba Azul Nature Reserve (image) University of Exeter Share Print E-Mail Caption Forest Island Isla Manechi (left) in the Barba Azul Nature Reserve where. Here is where the oldest evidence for cassava and squash was found. Credit Umberto Lombardo Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.