Petoskey A High Gravity Chip-Processing Variety with Long-term Storage Potential and Resistance to Common Scab

Abstract Petoskey is a high specific gravity round white chip-processing potato variety with resistance to common scab ( Streptomyces scabies ). It was selected from a cross between Beacon Chipper and the breeding line MSG227-2, and designated MSV030-4 during the trialling phase of its development. This variety has high yield potential with attractive round, uniform tubers with netted skin. Five years of field testing in Michigan demonstrate that yield of Petoskey is similar to Snowden with higher specific gravity averaging 1.089. Out-of-the field chip scores were comparable to Snowden while Petoskey chip scores outperform Snowden in long-term storage trials at eight months post-harvest. Petoskey has a medium upright canopy and a mid to full season maturity with excellent long-term storage chip-processing quality. This variety has performed well in Michigan in on-farm trials and multistate national SNAC trials. Formally released in 2019, Petoskey is a comparable alternative to Snowden with strong resistance to common scab. Producers can expect higher specific gravity and longer storage potential than Snowden with high chip-processing quality up to eight months post-harvest.