 Parentage:
Steuben x Kanona
Breeder:
Cornell University Potato Breeding Program,
Ithaca, NY
Release Date:
February 2003 (joint release of University of Maine and
Cornell University)
Description:
Mid-season chipstock line, very good storage chip color and
potential for chipping from long-term storage.
Plant Characteristics:
Type
nice vine type, moderate to large tops (typically slightly larger than Atlantic)
Maturity mid-season
(typically slightly earlier maturing than Atlantic)
Flowers white
Tuber Characteristics:
Shape mostly round, attractive shape
Eyes shallow
Skin bright,
smooth skin
Flesh white
 Resistances/Susceptibilities:
Golden nematode resistant
Net necrosis
resistant
Common scab
moderate resistance, somewhat less resistant than Superior or Pike
Monticello is moderately susceptible to late blight, early blight, powdery scab, and
blackspot bruise (similar to Snowden), large tubers can develop hollow heart.
New York Breeding Program Results:
U.S.#1 Yields: 97% of Atlantic or Kanona (average for 22 site-years, 1993-97)
Specific gravity: similar to Atlantic
Tuber size: small to medium, smaller than Atlantic
External defects: relatively low incidence
Internal defects: hollow heart less than Atlantic, can
develop IHN (less than Atlantic)
Chip color: very good color from 45F, similar to Snowden
Regional NE184 Small-plot Trials (Canada to North Carolina)2:
U.S.#1 Yields: 89% of Atlantic (average for 44 site-years, 1996-98 and 2000-2002)
Specific gravity: averaged 0.003 less than Atlantic
Tuber size: averaged much smaller than Atlantic
External defects: relatively low incidence
Hollow heart: 3% versus
11.5% for Atlantic
Chip color: good out of field, almost always good from storage
Cooking tests: acceptable boil and
bake scores
Maine Small-plot Trials:
Aroostook Research Farm (1996-98, 2000-2002):
 U.S. #1 Yield 81% of Atlantic, specific gravity 1.089
(0.002 less than Atlantic). Size similar to (two years) or much smaller (four years) than Atlantic,
no hollow heart observed compared to 3.8% in Atlantic, few external defect problems (average of 4%).
December Agtron from 50F:
68 vs Atlantic avg. 66 and Snowden avg. 67
February Agtron from 50F:
68 vs Atlantic avg. 65 and Snowden avg. 65
February Agtron from 45F:
66 vs Atlantic avg. 61 and Snowden avg. 63
February Recondition after 38F: 63 vs Atlantic avg. 57
and Snowden avg. 63
April Agtron from 50F:
66 vs Snowden avg. 61
Central Maine (1997-98, 2000-2002):
U.S. #1 Yield 108% of Atlantic, specific gravity 1.089
(0.005 less than Atlantic).
Size smaller than Atlantic, no hollow heart observed compared to 5% in
Atlantic,
moderate external defects (13.2% versus 28.4% for Atlantic)
December Agtron from 50F: 66 vs Atlantic avg. 63 and Snowden 65
March Agtron from 50F: 65 vs Atlantic avg. 62 and Snowden 65
March Agtron from 45F: 64 vs Atlantic avg. 54 and Snowden 64
March reconditioned from 45F: 65 vs Atlantic avg. 61 and Snowden
64
St. Agatha (1997-98, 2000-2002):
U.S. #1 Yield 95% of Atlantic, specific gravity 1.088 (0.001 lower than
Atlantic),
small to medium-sized tubers, average of 2% hollow heart compared to 2.5% for
Atlantic,
moderate external defects (17.1% versus 21.3% for Atlantic) usually due to
surface scab.
December Agtron from 50F: 64 vs Atlantic avg. 55
and Snowden 60
Dormancy and Small-scale Storage Tests3:
NY tests:
Dormancy two weeks longer than Atlantic and Monona
Maine tests: Dormancy similar to Kennebec; 2
to 4 weeks longer than Atlantic; 4 to 6 weeks longer than Snowden.
Weight loss 5-mo. @38F: 6.0% versus Atlantic 4.8% and
Snowden 4.9%
Weight loss 5-mo. @50F: 12.1% versus Atlantic 19.2% and
Snowden 20.6%
Maine Commercial-scale Results:
Seed
Production: Small amounts were produced on two farms during 1998 to 2000.
Stored well, no problems in the field or storage. One farm increased production
to 10, 23, and 35 acres from 2000 to 2002. Yields slightly over 300 cwt/A each
year, store well, no problems to date. Used 7.5" spacing and 180 lbs/A
nitrogen.
 Chip Production: One-acre each during 1999 and 2000. Yields >
adjacent standard storage variety, specific gravity 1.096 to 1.099,
small attractive tubers, chipped from April storage. 2001 season:
71 acres, 5 growers. 2002 season: 107 acres, 4
growers. Good yields where irrigated or adequate rainfall; small and bright;
very good quality except several growers reported a trace of blackspot, stored
and chipped well (had to be reconditioned in one 2001 storage after
ventilation problems; color improved nicely). Growers typically using 9-10"
spacing; 155 to 180 lbs/A nitrogen.
Management Suggestions:
General: This variety is
moderately susceptible to blackspot bruise, minimize
impacts and avoid harvesting under very dry conditions which promote blackspot
bruise. This variety performs best with good rainfall or good irrigation
management. It tends to be relatively low yielding (usually comparable to
other storage chippers) when conditions are very dry during tuber bulking.
Fertilizer: Moderate to high nitrogen rates 170 to 200 lbs/A
depending on soil conditions and crop rotation will help maintain late-season
vigor. Relatively high potash rates may be useful to keep specific gravity
from becoming excessively high and to reduce blackspot risk.
Spacing: 8 to 10" seed; 10" chipping
1 Results 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).
2 Growing conditions vary widely around the eastern region and
performance in a particular area may be different from the average results. See
the local trial reports or contact Greg Porter, 114 Deering Hall, University of
Maine, Orono, ME 04469 (207-581-2943) for more information about performance at
a specific location.
3 Storage screenings indicate relative differences among varieties and
do not guarantee "storage capability" under commercial conditions. Commercial
"storage 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.
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