Aflatoxins are carcinogens and mutagens produced by certain moulds. They must not enter the food chain. This experiment developed a test for aflatoxins and adapted a Husky robot to carry a sensor suite and adjustable sprayer. The robot navigates the field autonomously. Aflatoxin detection triggers local fungicide spraying or, if weather conditions are not favourable, a geotagged order for later spraying, based around a specialist decision support system.