Submitted to: American Journal of Potato Research
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 8/13/1996
Publication Date: N/A
Technical Abstract: A field survey of the blackspot bruise potential of Russet Burbank (RB) and Ranger Russet (RR) was conducted in Idaho in 1993 and 1994. The survey included 17 RB and 3 RR fields in 1993 and 28 RB and 8 RR fields in 1994. 1993 was an unusually cool and wet season whereas 1994 was hot and dry. Samples were collected prior to normal harvest and at harvest to determine tuber characteristics and management factors that may have been related to blackspot. The blackspot potential was measured using impact and abrasive peel tests. Field maturity was the factor most consistently related to blackspot severity both years. In 1994, a multiple regression of 3 independent variables - percent dead vines in late August, specific gravity of tubers, and soil moisture at sampling - with blackspot index as the dependent variable gave an R 2 of 0.70 and R of 0.84 (p=0.001). In 1993 specific gravity and available soil moisture were not factors in blackspot susceptibility of RB fields. Field maturity and specific gravity, but not soil moisture, were related to the blackspot potential of Ranger. The available data indicated no relationship between plant nutrient levels and blackspot.