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Publication #HS1277

University of Florida Potato Variety Trials Spotlight: 'Marcy'1

Rodrick Z. Mwatuwa, Christian T. Christensen, and Lincoln Zotarelli2

General Comments

‘Marcy’ is a white-flesh and white-skinned fresh-market potato variety released from the Cornell University Potato Breeding program in 1990. The cultivar was selected from a cross between 'Atlantic' and Q155-3 (De Jong et al. 2006). In trials conducted at the University of Florida, 'Marcy' demonstrated high yield and good tuber characteristics compared to its matched commercial standards, 'Atlantic' and 'La Chipper'. After its release, 'Marcy' has been cultivated in several trials in Florida. Production and quality results provided here are from variety trials conducted by the University of Florida Hastings Agricultural and Extension Center in 2002 and from 2011 to 2014.

General Characteristics

'Marcy' has white skin with an oval, slightly flattened shape. In field trials, marketable yield ranged from 208 to 326 cwt/ac and on average was 12% greater than that of 'Atlantic' and La Chipper. Approximately 91% of the tuber size distribution was found between the A1 and A3 size classification, which is considered marketable. The specific gravity of 'Marcy' is slightly lower than that of Atlantic, but this is not a limitation for the tablestock market. It has greater yield potential than other fresh-market potato varieties adapted for Florida production conditions.

Figure 1. 

Typical tuber and internal flesh color of 'Marcy' potato variety.


Credit:

Lincoln Zotarelli


[Click thumbnail to enlarge.]

Season Length and Growth

The tuber size should be closely monitored in the weeks prior to vine killing. When desired size distribution has been achieved, vines should be killed. This typically occurs about 85 to 95 days after planting depending on growing conditions during the season. The period from vine kill to harvesting varies by season; however, the plant should be given two weeks for tubers to mature and set skin. For more information on vine kill chemicals see Potato Vine killing or Desiccation, http://edis.ifas.ufl.edu/hs181

Fertilization

During the reported trials, fertilizer was applied two or three times at planting and one or two side-dress applications, one at plant emergence and one when vines reached 6–8” in height. The cumulative season N rate applied was approximately 200 lb N/acre. The first application of 100 lb N/acre was applied at planting and then also at side dress (split into one or two applications). Special consideration should be given to the management of nitrogen.

Planting

Tubers should break dormancy before planting. In Florida, recommended seed pieces of 21/2 to 3 oz should be planted 8 inches apart in rows spaced 40 inches apart. Closer in-row spacing reduces harvest tuber size. Excessive soil moisture late in the season degrades lenticel appearance and delays skin set.

Diseases

'Marcy' is resistant to brown rot, common scab, and race Ro1 of the golden cyst nematode. The variety is susceptible to PVX and PVY (De Jong et al. 2006), hollow heart, corky ringspot, and internal heat necrosis.

Other Information

For additional information on cultivation and management, see the Potato Production chapter of the Vegetable Production Handbook available at http://edis.ifas.ufl.edu/cv131 and Potato Vine Killing or Desiccation available at http://edis.ifas.ufl.edu/hs181

References

De Jong, W. S., D.E Halseth, B.B. Brodie, L.K. Perry, J.B. Sieczka, B.J. Christ, B. J., G.A. Porter, K.M. Paddock, M.W. Peck, and R.L. Plaisted. 2006. “Marcy: A chipping variety with resistance to common scab and the golden nematode.” American Journal of Potato Research 83(2): 189–193. http://link.springer.com/article/10.1007%2FBF02872154

Hutchinson, C. M., J. M. White, D. M., Gergela, P. A. Solano, K. G. Haynes, R. Wenrich, and C. S. Lippi. 2003. Performance of chip processing potato varieties in northeastern Florida. HortTechnology, 13(4), 706-711.

Sisson, J.A. and G.A. Porter. 2002. Performance evaluations of potato clones and varieties in the northeastern states-1999. Maine Agr. For. Expt. Sta., Misc. Publ. 751.

Zotarelli, L., P. Dittmar, P.D. Roberts, and S.E. Webb. 2015. "Potato Production in Florida." In: Vegetable Production Handbook for Florida 2015–2016. HS733. Gainesville: University of Florida Institute of Food and Agricultural Sciences. http://edis.ifas.ufl.edu/pdffiles/CV/CV13100.pdf (Accessed 01/11/2016).

Zotarelli, L., S. Sargent, P. Dittmar, and M. Makani. 2016. Potato Vine Killing or Desiccation. Gainesville: University of Florida Institute of Food and Agricultural Sciences. http://edis.ifas.ufl.edu/hs181

Tables

Table 1. 

Summary of production statistics and specific gravity of 'Marcy', a white skinned, fresh-market variety grown at the UF/IFAS Hastings Agricultural Extension Center in Hastings, FL.

Year

Total Yield

Marketable Yield1

% of Standard2

Size Class (Distribution by Class %)3

Size Class Range %

Specific Gravity

 

(cwt/A)

(cwt/A)

Atlantic

La Chipper

C

B

A1

A2

A3

A4

A1 to A3

2002

230

208

n.a.

92%

n.a.*

3

45

49

3

0

97

1.070

2011

349

290

104%

121%

2

11

64

18

5

0

87

1.067

2012

370

326

92%

118%

1

4

53

25

17

0

95

1.069

2013

285

230

108%

132%

2

7

64

15

10

1

90

1.060

2014

364

303

129%

n.a.

1

10

68

12

8

0

88

1.063

Average

320

271

108%

116%

2

7

59

24

9

0

91

1.066

1Marketable yield: sum of size classes A1 to A3.

2% of standard: comparison of marketable yield between 'Marcy' and 'La Chipper' or 'Atlantic' cultivated in the same trial and year.

3Size classes: C = 0.5 to 1.5 inches, B = 1.5 to 1 7/8 inches, A1 = 1 7/8 to 2.5 inches, A2 = 2.5 to 3.25 inches, A3 = 3.25 to 4 inches, A4 >4 inches;

Size distribution by class: Class (wt)/(Total Yield [wt] – Culls [wt])

n.a. = not available.

* classification = <1 7/8 inches (C and B included in this classification)

Table 2. 

Florida rating codes for potato tuber characteristics1

Plant and Tuber Characteristics

Rating Code

Vine Maturity

Internal Flesh Color

Skin Color

Skin Texture

Tuber Shape

Eye Depth

Overall Appearance

1

dead

white

purple

partial russet

round

very deep

very poor

2

+-

cream

red

heavy russet

mostly round

--

--

3

yellow and dying

light yellow

pink

moderate russet

round to oblong

deep

poor

4

+-

medium yellow

dark brown

light russet

mostly oblong

--

--

5

moderately senesced

dark yellow

brown

netted

oblong

intermediate

fair

6

+-

pink

tan

slightly netted

oblong to long

--

--

7

starting to senesce

red

buff

moderately smooth

mostly long

shallow

good

8

+-

blue

white

smooth

long

--

--

9

green and vigorous

purple

cream

very smooth

cylindrical

very shallow

excellent

1Adapted from Hutchinson, C. M. et al. (2003), and Sisson, J.A. and G.A. Porter (2002).

Table 3. 

Vine maturity, tuber characteristics, and internal tuber defects of 'Marcy', a white-skinned, fresh-market potato variety grown at the UF/IFAS Hastings Agricultural Extension Center in Hastings, FL.

Year

Vine Maturity (vine kill)

Tuber Characteristics1

Internal Defects2

IFC

SC

ST

TS

ED

APP

HH

BR

CRS

IHN

2002

4

1

5

5

3

8

5

0

0

1

0

2011

5

1

6

5

4

5

6

1

0

10

1

2012

7

2

7

5

4

4

6

0

1

0

1

2013

6

1

6

5

3

6

6

3

0

1

1

2014

2

1

6

5

3

6

6

0

0

0

0

Average

5

1

6

5

3

6

6

1

0

2

1

1See rating system outlined in Florida Rating Code Table (Table 3); IFC, internal flesh color; SC, skin color; ST, skin texture; TS, tuber shape; ED, eye depth; APP, overall appearance.

2Percent tuber defects. HH = hollow heart, BR = brown rot, CRS = corky ring spot, IHN = internal heat necrosis.

Footnotes

1.

This document is HS1277, one of a series of the Horticultural Sciences Department, UF/IFAS Extension. Original publication date March 2016. Visit the EDIS website at http://edis.ifas.ufl.edu.

2.

Rodrick Z. Mwatuwa, research assistant; Christian T. Christensen, graduate student; Lincoln Zotarelli, assistant professor; Horticultural Sciences Department, UF/IFAS Extension, Gainesville, FL 32611.


The Institute of Food and Agricultural Sciences (IFAS) is an Equal Opportunity Institution authorized to provide research, educational information and other services only to individuals and institutions that function with non-discrimination with respect to race, creed, color, religion, age, disability, sex, sexual orientation, marital status, national origin, political opinions or affiliations. For more information on obtaining other UF/IFAS Extension publications, contact your county's UF/IFAS Extension office.

U.S. Department of Agriculture, UF/IFAS Extension Service, University of Florida, IFAS, Florida A & M University Cooperative Extension Program, and Boards of County Commissioners Cooperating. Nick T. Place, dean for UF/IFAS Extension.