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Keuka Gold
Monticello (NY102)
AF1758-7

Maine Agricultural and Forest Experiment Station
 The University of Maine Potato Development Project

AF1758-7—Potato Variety Profile1
Draft date: April 10, 2001 (revised April 24, 2006)

Parentage:

AF303-5 x CF7608-19

Breeder:

Maine Potato Breeding Program; Aroostook Research Farm, Presque Isle, ME

Release Date:

n/a

Description: 

Medium-late to late maturing, scab resistant tablestock line adapted to northern growing areas

Plant Characteristics:

Type       large-sized tops (equal to or larger than Katahdin)

Maturity   medium-late to late (has ranged from slightly earlier to slightly later than Katahdin)

Flowers    purple

Tuber Characteristics:

Shape     round to slightly oblong, attractive shape

Eyes       shallow

Skin        moderately smooth to slightly netted

Flesh       white

Resistances/Susceptibilies:

Net necrosis          resistant

Golden nematode    resistant

Verticillium wilt       moderately resistant

Early blight            moderately resistant

Common scab         good resistance

Powdery scab         moderately resistant to moderately susceptible  

Corky ring spot       resistant

Internal defects      resistant to hollow heart

Blackspot bruise      resistant

Susceptible to late blight, PLRV, PVY, and wart. Susceptible to internal heat necrosis where this internal defect is a problem. Research trials indicate that this clone is relatively susceptible to shatter bruise

Regional NE1014 Small-plot Trials (Canada to Florida)2:

U.S.#1 Yields      105% of Katahdin (average for 38 site-years, 2000-2003, best at northern sites)
110% of Superior (average for 38 site-years, 2000-2003, best at northern sites)

Specific gravity   averaged 0.0012 less than Katahdin

Tuber size          usually equal to Katahdin

External defects  usually low incidence, misshapen tubers in southern and coastal states

Hollow heart        0.5% vs 4.4% for Katahdin and 0.2% for Superior (2000 to 2004)

Chip color           not acceptable for chipping

Cooking tests      good boiled scores, acceptable baked in most tests (bakes very moist)

 Maine Small-plot Trials:

U.S.#1 Yields      141% of Katahdin (average for 15 site-years,1997-2003)
105% of Atlantic (average for 11 site-years, 1997-2003)

Specific gravity    averaged 0.0011 less than Katahdin

Tuber size           usually equal to Katahdin

External defects   usually low incidence (7.8% compared to 25.0% for Katahdin)

Hollow heart        0% vs 1.2% for Katahdin and 4.8% for Atlantic

Chip color           not acceptable for chipping

Cooking tests      good boiled scores, acceptable baked (bakes very moist)

Dormancy and Small-scale storage tests3:

Maine tests:                 Short dormancy, on-average 6 weeks earlier than Katahdin

Weight loss 5-mo. @38F: Acceptable, 4.4% vs 4.2% for Katahdin

Weight loss 5-mo. @50F: High, 21.6% vs 12.8% for Katahdin

Maine Challenge Grant Results:

2002: St Agatha commercial test, 301 cwt/A (better than Superior or Ontario), medium to large size, good early and late vigor, very few external defects, dug when very mature and had no bruise problem, sold out of field, would grow again. Management: spaced at 8 inches, Sencor applied pre-emergence, 1275 lbs/A of 14-14-14 fertilizer at planting.

2001: St Agatha commercial test, poor stand, could not judge yield, large size, good  late vigor, very few external defects, moderate skinning and bruising at harvest, but stored well, would grow again. Management: spaced at 7.25 inches, Sencor applied pre-emergence, 1375 lbs/A of 14-14-14 fertilizer at planting.

Aroostook Research Farm commercial-scale tests: 1999 crop, average yields, good size, good appearance, very few defects, did well in storage--considerable sprouting, no fusarium, very little pressure bruise; 2000 crop, 234 cwt/A, small size, good quality, very few defects; 2005 crop, 313 cwt/A, good size, bright, packed well.

Management Suggestions:

Fertilizer:   Suggest moderate nitrogen rates, approximately 140 to 150 lbs/A, but may adjust depending on soil conditions and crop rotation. Use low postash rates when possible (80 to 100 lbs/A) to help reduce shatter bruise susceptiblity and improve specific gravity.

Spacing:    7-8 " seed; 8 to 9" table

Other:       Do not use post-emergence metribuzin herbicides (e.g. Sencor). Pre-emergence applications at moderate rates seem to be fine under Maine conditions. Due to shatter bruise susceptibility, harvest under warm conditions and when soil is dry, if possible. Low rates of potash fertilizer can help reduce susceptibility to shatter. Sprouting  in storage occurs quite early. Store it at 36 to 38F and use a sprout inhibitor if storing for fresh market.

1Results presented reflect current information available at the time of printing and is based on both research results and commercial trials.  The information will need to be updated as more trials are conducted.  For more information see the release publication (if  noted above), contact the originating breeding program, or contact Greg Porter, 5722 Deering Hall, Room #114, University of Maine, Orono, ME 04469 (207-581-2943).

2Growing conditions vary widely around the eastern region and performance in a particular area may be different from the average results.  See the annual trial reports or contact Greg Porter, 5722 Deering Hall, Room #114, University of Maine, Orono, ME 04469 (207-581-2943) for more information about performance at a specific location.

3Storage screenings indicate relative differences among varieties and do not guarantee Astorage capability@ under commercial conditions.  Commercial Astorage capability@ will depend on growing conditions, harvesting and handling practices, pest management,  storage size and management, etc.  The reported weight-loss values were generated from tubers that did not receive any sprout inhibitors.