The Pesticide Management Regulatory Agency granted an emergency use registration for Confine (mono-and di-potassium salts of phosphorous acid) on July 30 for post-harvest application of potatoes for the suppression of silver scurf.
Caused by the fungus Helminthosporium solani, silver scurf is a common disease of potato. The brown blemishes that develop on the tuber surface lower the crop’s market value. These losses are greatest when the disease occurs on tubers with white or red skin intended for the table-stock market. Silver scurf-infected tubers may be more susceptible to secondary infection by other pathogens.
The table potato industry has been experiencing losses due to down grading of potatoes, and had requested that MAFRI seek an emergency use approval. Manitoba coordinated the submission to PMRA on behalf of the provinces of Alberta, Saskatchewan, Ontario and PEI.
The product is not recommended for use on potatoes intended for seed.