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Publication #HS1295

University of Florida Potato Variety Trials Spotlight: ‘Peter Wilcox'1

Rodrick Z. Mwatuwa, Christian T. Christensen, Pam Solano, Kathleen G. Haynes, and Lincoln Zotarelli2

General Comments

‘Peter Wilcox’ is a fresh market potato variety selected from progeny of a cross between B0810-1 and B0918-5 and tested under the pedigree B1816-5 by K.G. Haynes. It was jointly released by the United States Department of Agriculture, the North Carolina Agricultural Research Service, the Agricultural Experiment Stations of New Jersey, Pennsylvania, Florida, and New York, and the Maine Agricultural and Forest Experiment Station in 2007. ‘Peter Wilcox’ demonstrates good tuber characteristics and high yields. Yields are slightly lower than the commercial standard ‘Red LaSoda’ (RLAS). Tuber production and quality results provided in this spotlight are from Florida Potato Variety Trials conducted at the UF/IFAS Hastings Agricultural Extension Center between 2001 and 2016.

General Characteristics

‘Peter Wilcox’ has a semi-erect plant habit with intermediate foliage. Tubers have a purple and slightly netted skin with a medium yellow flesh (Figure 1), according to Florida rating codes for potato tuber characteristics (Table 1). The tubers have a fair to good appearance with round to oblong shape and intermediate eye depth with apical distribution (Tables 1 and 3). The tubers have a low to medium specific gravity of 1.065 (Table 2) with a long dormancy (time required for sprout emergence). ‘Peter Wilcox’ has high yield potential under Florida production conditions with 219 cwt/acre marketable yield and 74% of the tubers produced in tuber size distribution classes A1 and A3 (Table 2).

Figure 1. 

Typical tuber and internal flesh color of ‘Peter Wilcox’ potato variety.


Credit:

Lincoln Zotarelli, UF/IFAS


[Click thumbnail to enlarge.]

Diseases

‘Peter Wilcox’ demonstrates no incidence of hollow heart, brown rot, corky ring spot, or internal heat necrosis (Table 3). It is resistant to powdery scab (Spongospora subterranea) and susceptible to late blight (Phytophthora infestans), early blight (Alternaria solani), common scab (Streptomyces scabies), potato virus Y, and potato virus S. The cultivar is highly susceptible to Verticullium wilt (Verticillium albo-atrum and Verticillium dahliae). The standard UF/IFAS Extension-recommended disease and weed control program described under “Potato Production” (Chapter 13 of the Vegetable Production Handbook for Florida http://edis.ifas.ufl.edu/cv131) should be followed.

Season Length and Growth

‘Peter Wilcox’ is a medium maturing cultivar under Florida growing conditions. Season length was 91 days on average from planting to harvest. This depended on weather conditions during the growing season. The plants should be harvested two to three weeks after vine kill to improve tuber maturation and skin set. Potatoes with proper skin set maintain better skin color, lose less weight in storage, and are more resistant to bruising and soft rot. For more information about vine killing on potatoes, see Potato Vine Killing or Desiccation described in Zotarelli et al. (2011). Late in the season, tuber size should be checked regularly in order to harvest tubers with desirable marketable size. Soil moisture should be managed late in the season to avoid high soil moisture conditions that cause enlarged lenticels and delayed skin set.

Fertilization

UF/IFAS trial plots are normally fertilized with 200 to 230 lb/A of N. The first application of 100 lb/A of N (granular) is typically incorporated in the bed prior to planting, followed by one or two side dress fertilizer applications at emergence and/or at tuber initiation. Phosphorus and potassium applications follow the UF/IFAS guidelines described in Liu et al. (2016) and normally range between 45 to 100 lb/A of P2O5 and 170 to 235 lb/A of K2O.

Planting

A seed piece of 2.5 to 3 oz is recommended for planting. This variety should be planted with 40 inches between rows and 8 inches between plants, at 3 to 4 inches deep. A seed rate of 2,000 to 3,000 lb/acre of seed is expected.

Other Information

For additional information on cultivation and weed and disease management see the “Potato Production” chapter of the Vegetable Production Handbook available at http://edis.ifas.ufl.edu/cv131.

References

Haynes, K. G., G. Craig Yencho, M. E. Clough, M. R. Henninger, X. S. Qu, B. J. Christ, et al. 2015. "Peter Wilcox: a New Purple-Skin, Yellow-Flesh Fresh Market Potato Cultivar with Moderate Resistance to Powdery Scab." American Journal of Potato Research 92(5): 573–581.

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.

Liu, G., E.H. Simonne, K.T. Morgan, G.J. Hochmuth, M. Ozores-Hampton, and S. Agehara. 2016. “Fertilizer management for vegetable production in Florida.” In: Vegetable Production Handbook of Florida 2016–17. J.S. Freeman et al. (eds). Farm Media Journal. p.3–10.

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., J. P. Dittmar, P. D. Roberts, P. Stansly, H. A. Smith, and S. E. Webb. 2016. Chapter 13. Potato Production. Vegetable Production Handbook for Florida, 2015–2016 Edition. HS733. Gainesville: University of Florida Institute of Food and Agricultural Sciences. http://edis.ifas.ufl.edu/cv131

Zotarelli, L., S. Sargent, P. Dittmar, M. Makani. 2011. Potato vine Killing or Desiccation. HS181. Gainesville: University of Florida Institute of Food and Agricultural Sciences. http://edis.ifas.ufl.edu/hs181

Tables

Table 1. 

Florida rating codes for potato vine maturity and tuber characteristics.

Tuber Characteristics1

Rating Code

Vine Maturity

Internal Flesh Color

Skin Color

Skin Texture

Tuber Shape

Eye Depth

Overall Tuber Appearance

1

dead

white

purple

partial russet

round

very deep

very poor

2

+-

cream

red

heavy russet

mostly russet

--

--

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

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

Table 2. 

Summary of production statistics and specific gravity of ‘Peter Wilcox’, a purple-skinned fresh market potato variety grown at the UF/IFAS Hastings Agricultural Extension Center, Hastings, FL from 2001 to 2016.

Year

Total Yield (cwt/ac)

Marketable yield1 (cwt/ac)

% of STD

Standard

Size Class (Distribution by class %)2

Range %

Specific Gravity

C

B

A1

A2

A3

A4

A1 to A3

Culls

2001

313

259

93

‘Red Lasoda’

0

14*

77

8

1

0

86

4

1.069

2002

339

296

87

‘Red Lasoda’

0

10*

72

17

1

0

90

3

1.064

2003

461

400

95

‘Red Lasoda’

5

5

51

33

6

0

90

4

1.062

2004

330

248

76

‘Red Lasoda’

12

12

70

6

0

0

75

1

1.076

2005

272

197

66

‘Red Lasoda’

1

23

75

1

0

0

76

5

1.072

2006

333

273

68

‘Red Lasoda’

2

15

84

0

0

0

84

3

1.070

2007

354

278

80

‘Red Lasoda’

2

19

76

3

0

0

79

0

1.067

2008

256

150

78

‘Red Lasoda’

4

35

59

2

0

0

61

3

1.071

2009

287

207

61

‘Red Lasoda’

2

13

65

17

3

0

85

20

1.062

2010

286

110

47

‘Red Lasoda’

10

50

39

0

0

0

39

3

1.060

2011

351

245

109

‘Red Lasoda’

5

21

74

0

0

0

74

10

1.062

2012

311

214

124

‘Red Lasoda’

3

17

68

12

0

0

80

15

1.060

2013

229

165

154

‘Red Lasoda’

4

17

73

6

0

0

79

10

1.055

2014

339

208

93

‘Red Lasoda’

4

32

63

1

0

0

64

4

1.062

2015

109

61

43

‘Red Lasoda’

5

35

60

0

0

0

60

7

1.060

2016

282

189

208

‘Red Lasoda’

5

26

68

1

0

0

69

3

1.069

Average

303

219

93

 

4

22

67

7

1

0

74

6

1.065

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

2 Size 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])

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

Table 3. 

Vine maturity, tuber characteristics, and internal tuber defects of Peter Wilcox, a purple-skinned fresh market potato variety grown at the UF/IFAS Hastings Agricultural Extension Center, Hastings, FL from 2001 to 2016.

Year

Vine Maturity

Tuber Characteristics1

Internal Defects2

Internal Flesh color

Skin Color

Skin Texture

Tuber Shape

Eye Depth

Overall Appearance

HH

BR

CRS

IHN

2001

3

4

1

6

3

7

6

0

0

0

0

2002

4

4

1

7

3

7

6

0

0

0

0

2003

8

5

1

5

3

6

6

3

0

0

0

2004

6

4

1

6

3

6

6

1

0

0

0

2005

6

5

1

5

4

5

6

0

0

0

0

2006

8

4

2

6

3

7

6

0

0

0

0

2007

6

4

1

7

4

5

6

0

0

0

0

2008

7

5

1

7

3

6

6

0

0

0

0

2009

6

4

1

6

4

4

6

0

0

0

0

2010

7

4

1

6

4

7

6

0

0

0

0

2011

7

4

1

6

4

3

6

0

0

0

0

2012

9

5

1

6

4

4

6

0

1

0

0

2013

7

3

1

5

2

4

5

0

0

1

0

2014

4

5

1

7

3

4

8

0

0

0

0

2015

5

na3

na

na

na

na

6

0

0

0

0

2016

6

3

1

7

3

7

7

0

0

3

1

Average

6

4

1

6

3

5

6

0

0

0

0

1 See rating system outlined in Florida Rating Code Table (Table 1).

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

3 na = data not available

Footnotes

1.

This document is HS1295, one of a series of the Horticultural Sciences Department, UF/IFAS Extension. Original publication date May 2017. Visit the EDIS website at http://edis.ifas.ufl.edu.

2.

Rodrick Z. Mwatuwa, research assistant; Christian T. Christensen, postdoctoral research associate, Pam Solano; biological scientist; Kathleen G. Haynes, Genetic Improvement of Fruits and Vegetables Laboratory, USDA-ARS, Beltsville, MD; and 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.