The three chemicals approved for use in potatoes as desiccants are sulphuric acid, diquat and glufosinate-ammonium. Products which contain sodium chlorate are not approved for this purpose. The use of sulphuric acid as a haulm desiccant is subject to specified conditions. Operators must be trained with the appropriate Certificate of Competence, use the correct protective equipment and have emergency eyewash available at all times. Warning notices must be displayed at field entrances and owners of adjoining crop or property advised in advance.
All desiccants have potential to damage adjacent crops.
Drift must be avoided by correct use of equipment and consideration of weather conditions.