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REPRODUCE LOCALLY. Include form number and date on all reproductions. Form Approved OMB NO 0581-0055

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reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. 

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USDA is an equal opportunity provider and employer.

U.S. DEPARTMENT OF AGRICULTURE Exhibit C 

AGRICULTURAL MARKETING SERVICE

SCIENCE AND TECHNOLOGY

PLANT VARIETY PROTECTION OFFICE

OBJECTIVE DESCRIPTION OF VARIETY

Potato (Solanum tuberosum L.) 

INSTRUCTIONS

The Objective Description Form:

The objective description form lists characteristics to be used as the basis for developing the description of potato 

varieties. It is designed to guide the applicant in describing a variety in detail so a meaningful comparison with 

other potato varieties can be accomplished. It is recommended that this form be completed in as much detail as 

possible to ensure an accurate description. Please fill in the requested data and place the appropriate number that 

describes the varietal characters typical of this potato variety and the reference varieties in the respective boxes.

Test Guidelines:

Any statistical and trial (field test) data that may be necessary to support the variety description should be attached 

to this form. Please include for trial data the plot size, number of replications, number of plants, plant spacing, trial 

locations and growing periods. Trials should normally be conducted at one place, in the region that the variety has 

been adapted. All comparative data should be determined from varieties entered in the same trials. The size of the 

plots should be such that plants or parts of plants may be removed for measuring and counting without prejudice to 

the observations which must be made at the end of the growing period. As a minimum, each test should include a 

total of 60 plants which should be divided between two or more replicates. Separate plots for observation and 

measuring can only be used if they have been subject to similar environmental conditions. To determine color for a 

plant or plant parts a recognized standard color chart must be used such as the Royal Horticultural Society (RHS) 

Color Chart or Munsell Color Chart (MCC).

Reference Varieties:

The application variety should be compared to at least one reference variety preferably a set of reference varieties. 

The reference varieties should be market class standard varieties currently grown in the United States and or the 

variety (ies) most similar. The following varieties are recommended as market class standards to be used as 

reference varieties:

Yellow-flesh table-stock .........................Yukon Gold

Round-white table-stock.........................Superior

Chip-processing .....................................Atlantic, Snowden, Norchip

Frozen-processing .................................Russet Burbank

Russet table-stock..................................Russet Burbank, Russet Norkotah, Goldrush

Red table-stock ......................................Red Pontiac, Red Norland, Red Lasoda

If the applicant does not use one of the recommended reference varieties by the PVP office, a complete description 

of the reference variety should be submitted by the applicant (Exhibit C). 
Exhibit C (Potato)

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Characteristics:

Light sprout characteristics are supplied in Figure 1. The plant type and growth habit characteristics are 

collected at early first bloom. Figure 2 is supplied to help visualize the growth habit. For this descriptor, look 

at the stems rather than the stems and foliage. Plant maturity is measured at natural vine senescence.

Stem characteristics are also collected at early bloom. Stem anthocyanin coloration is divided into two 

descriptors: Location and intensity. Figure 3 is supplied to give an example of stem wings.

Leaf characteristics are observed at early first bloom. Fully-developed leaves located on the middle third of 

the plant should be used. Leaf pubescence refers to general trichomes. Figure 4 is supplied for examples of 

leaf silhouette. Leaf stipules are shown in Figure 5 for visual definition. Figure 6 is supplied to define leaf 

characteristics. Figure 7 should be used to describe terminal and primary leaflet shape. Figures 8 and 9 are 

used to describe the terminal and primary leaflet shape of tip and base, respectively. To measure the total 

number of primary leaflets pairs, collect 10 fully developed petioles (with leaves attached from each 

replication) and take the average number of secondary and tertiary leaflets. Glandular trichomes should be 

described in the Additional Comments and Characteristics (Descriptor 15). 

Inflorescence characteristics should be measured at early first bloom. Figures 10, 11 and 12 are supplied to 

describe anther and stigma shape, respectively. Corolla, calyx, anther, stigma, and pollen should be 

observed on newly opened flowers. Berry production should be based on field-grown plants rather than 

greenhouse plants.

Tuber characteristics should be observed following harvest. Figures 13 and 14 are available to describe 

distribution of secondary color and tuber shape, respectively. 

Disease and pest reactions should be based upon specific tests or statistical analysis rather than just field 

observations, rating 1 as Highly Resistance and 9 as Highly Susceptible, please follow the scale on each 

descriptor. Other diseases or pests reactions not requested can be described if it is felt that it would be 

helpful to determine novelty of the variety.

Quality characteristics should be described according to the market use.

If the plant is transgenic, this gene insertion(s) should be described.

Chemical identification and any other characteristics can be described if they are helpful in distinguishing the 

variety.
Exhibit C (Potato)

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NAME OF APPLICANT (S) TEMPORARY OR EXPERIMENTAL DESIGNATION VARIETY NAME

ADDRESS (Street and No. or RD No., City, State, Zip Code, and Country) FOR OFFICIAL USE ONLY

PVPO NUMBER

1. MARKET CHARACTERISTICS: 

 ____ MARKET CLASS:

1 = Yellow-flesh Tablestock 2 = Round-white Tablestock 3 = Chip-processing 4 = Frozen-processing

5 = Russet Tablestock 6 = Other _____________________________________

2. LIGHT SPROUT CHARACTERISTICS: (See Figure 1)

 ____ LIGHT SPROUT: GENERAL SHAPE

1 = Spherical 2 = Ovoid 3 = Conica 4 = Broad cylindrica 5 = Narrow cylindrical 6 = Other __________________________

 ____ LIGHT SPROUT BASE: PUBESCENCE OF BASE

1 = Absent 2 = Weak 3 = Medium 4 = Strong 5 = Very Strong

 ____ LIGHT SPROUT BASE: ANTHOCYANIN COLORATION

1 = Green 2 = Red-violet 3 = Blue-violet 4 = Other(describe) _________________________________

 ____ LIGHT SPROUT BASE: INTENSITY OF ANTHOCYANIN COLORATION (IF PRESENT)

1 = Absent 2 = Weak 3 = Medium 4 = Strong 5 = Very Strong

 ____ LIGHT SPROUT TIP: HABIT

1 = Closed 2 = Intermediate 3 = Open

 ____ LIGHT SPROUT TIP: PUBESCENCE

1 = Absent 2 = Weak 3 = Medium 4 = Strong 5 = Very Strong

____ LIGHT SPROUT TIP ANTHOCYANIN COLORATION

1 = Green 2 = Red-violet 3 = Blue-violet 4 = Other(describe) __________________________________

____ LIGHT SPROUT TIP: INTENSITY OF ANTHOCANIN COLORATION (IF PRESENT)

1 = Absent 2 = Weak 3 = Medium 4 = Strong 5 = Very Strong

____ LIGHT SPROUT ROOT INITIALS: FREQUENCY

1 = Absent 2 = Some 3 = Abundant

3. PLANT CHARACTERISTICS:

____ GROWTH HABIT: (See Figure 2)

3 = Erect (>45° with ground) 5 = Semi-erect (30-45° with ground) 7 = Spreading

____ TYPE: 

1 = Stem (foliage open, stems clearly visible) 2 = Intermediate 3 = Leaf (Foliage closed, stems hardly visible

____ MATURITY: Days after planting (DAP) at vine senescence

PLANTING DATE: ______________________

____ REGIONAL AREA:

1 = Pacific North West (WA, OR, ID, CO, CA) 2 = North Central (ND, WI, MI, MN, OH) 3 = North East (ME, NY, PA, NJ, MD, MA, RI,) 

4 = Mid-Atlantic Erect (VI, NC, SC, South NJ, FL) 5 = South (LA, TX, AZ, NE) 6 = Canada 

7 = Europe 8 = England 9 = Latin America 10 = Brazil 11 = Other ____________________________

____ MATURITY CLASS:

1 = Very Early (<100 DAP) 2 = Early (100-110 DAP) 3 = Mid-season (111-120 DAP) 4 = Late (121-130 DAP) 5 = Very Late (>130 DAP).

4. STEM CHARACTERISTICS: Measure at early first bloom

1 = Absent 3 = Weak 5 = Medium 7 = Strong 9 = Very Strong

____ STEM ANTHOCYANIN COLORATION:

____ STEM WINGS: (See Figure 3)
Exhibit C (Potato)

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5. LEAF CHARACTERISTICS:

____ LEAF COLOR: (Observe fully developed leaves located on middle 1/3 of plant)

1 = Yellowing-green 2 = Olive-green 3 = Medium Green 4 = Dark Green 5 = Grey-green 6 = Other _________________________

____ LEAF COLOR CHART VALUE: Royal Horticulture Society Color Chart or Munsell Color Chart

(Observe fully developed leaves located on middle 1/3 of plant and circle the appropriate color chart)

____ LEAF PUBESCENCE DENSITY:

1 = Absent 2 = Sparse 3 = Medium 4 = Thick 5 = Heavy

____ LEAF PUBESCENCE LENGTH:

1 = None 2 = Short 3 = Medium 4 = Long 5 = Very Long

(Note Descriptor #15 (Additional Comments and Characteristics) can be used to describe the type and length of the glandular trichomes observed.)

____ LEAF SILHOUETTE: (See Figure 4)

1 = Closed 3 = Medium 5 = Open

____ PETIOLES ANTHOCYANIN COLORATION:

1 = Absent 3 = Weak 5 = Medium 7 = Strong 9 = Very Strong

____ LEAF STIPULES SIZE: (Se Figure 5)

1 = Absent 3 = Small 5 = Medium 7 = Large

____ TERMINAL LEAFLET SHAPE (See Figures 6 and 7)

1 = Narrowly ovate 2 = Medium Ovate 3 = Broadly Ovate 4 = Lanceolate 5 = Elliptical 6 = Obovate 7 = Oblong 8 = Other ____________

____ TERMINAL LEAFLET TIP SHAPE: (See Figures 6 and 8)

1 = Acute 2 = Cuspidate 3 = Acuminate 4 = Obtuse 5 = Other _________________________

____ TERMINAL LEAFLET BASE SHAPE: (See Figure 9)

1 = Cuneate 2 = Acute 3 = Obtuse 4 = Cordate 5 = Truncate 6 = Lobed 7 = Other ________________________

____ TERMINAL LEAFLET MARGIN WAVINESS:

1 = Absent 2 = Slight 3 = Weak 4 = Medium 5 = Strong

NUMBER OF PRIMARY LEAFLET PAIRS: (See Figure 6)

AVERAGE: _______

RANGE: ______ to _______

____ PRIMARY LEAFLET TIP SHAPE: (See Figures 6 and 8)

1 = Acute 2 = Cuspidate 3 = Acuminate 4 = Obtuse 5 = Other ___________________________

____ PRIMARY LEAFLET SIZE:

1 = Very Small 2 = Small 3 = Medium 4 = Large 5 = Very Large

____ PRIMARY LEAFLET SHAPE: (See Figures 6 and 7)

1 = Narrowly ovate 2 = Medium ovate 3 = Broadly ovate 4 = Lanceolate 5 = Elliptical 6 = Ovate 7 = Oblong 8 = Other _____________

____ PRIMARY LEAFLET BASE SHAPE: (See Figures 6 and 9)

1 = Cuneate 2 = Acute 3 = Obtuse 4 = Cordate 5 = Truncate 6 = Lobed 7 = Other _____________________________

NUMBER OF SECONDARY AND TERTIARY LEAFLET PAIRS: (See Figure 6)

AVERAGE: _______

RANGE: ______ to _______

NUMBER OF INFLORESCENCE/PLANT:

AVERAGE: _______

RANGE: ______ to _______

NUMBER OF FLORETS/INFLORESCENCE:

AVERAGE: _______

RANGE: ______ to _______
Exhibit C (Potato)

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5. LEAF CHARACTERISTICS: (continued)

____ COROLLA INNER SURFACE COLOR CHART VALUE: Royal Horticulture Society Color Chart or Munsell Color Chart (Measure predominant color of 

newly open flower and circle the appropriate color chart)

____ COROLLA OUTER SURFACE COLOR CHART VALUE: Royal Horticulture Society Color Chart or Munsell Color Chart (Measure predominant color of 

newly open flower and circle the appropriate color chart)

____ COROLLA INNER SURFACE COLOR: (Measure predominant color of newly open flower, if flowers are bi-color please use the ratio codes)

1 = White 2 = Red-violet 3 = Blue-violet 4 = Cream 5 = Red-purple 6 = Blue 7 = Pink 8 = Pink-white 9 = Purple 10 = Violet

11 = Purple-violet 13 = Violet-White 1:1 14 = Violet-White 1:3 15 = Violet-White 3:1 16 = Violet-White Halo 17 = Pink-White 1:1 18 = PinkWhite 1:3 19 = Pink-White 3:1 20 = Pink-White Halo 21 = RedViolet-White 1:1 22 = RedViolet-White 1:3 23 = RedViolet-White 3:1 24 = 

RedViolet-White Halo 25 = BlueViolet-White 1:1 26 = BlueViolet-White 1:3 27 = BlueViolet-White 3:1 28 = BlueViolet-White Halo 

12 = Other ____________________

____ COROLLA SHAPE: (See Figure 10)

1 = Very rotate 2 = Rotate 3 = Pentagonal 4 = Semi-stellate 5 = Stellate

6. INFLORESCENCE CHARACTERISTICS:

____ CALYX ANTHOCYANIN COLORATION:

1 = Absent 3 = Weak 5 = Medium 7 = Strong 9 = Very strong

____ ANTHER COLOR CHART VALUE: Royal Horticulture Society Color Chart or Munsel Color Chart (Measure when newly opened flower is fully 

expanded and circle the appropriate color chart)

____ ANTHER SHAPE: (See Figure 11)

1 = Broad cone 2 = Narrow cone 3 = Pear-shaped cone 4 = Loose 5 = Other

____ POLLEN PRODUCTION:

1 = None 3 = Some 5 = Abundant

____ STIGMA SHAPE: (See Figure 12)

1 = Capitate 2 = Clavate 3 Bi-lobed

____ STIGMA COLOR CHART VALUE: Royal Horticulture Society Color Chart or Munsel Color Chart (Circle the appropriate color chart)

____ BERRY PRODUCTION: (Under field conditions)

1 = Absent 3 = Low 5 = Moderate 7 = Heavy 9 = Very Heavy

7. TUBER CHARACTERISTICS:

____ PREDOMINANT SKIN COLOR:

1 = White 2 = Light Yellow 3 = Yellow 4 = Buff 5 = Tan 6 = Brown 7 = Pink 8 = Red 9 = Purplish-red 

10 = Purple 11 = Dark purple-black 12 = Other ________________________

____ PREDOMINANT SKIN COLOR CHART VALUE: Royal Horticulture Society Color Chart or Munsell Color Chart (Circle the appropriate color chart)

____ SECONDARY SKIN COLOR:

1 = Absent 2 = Present (please describe)

____ SECONDARY SKIN COLOR CHART VALUE: Royal Horticulture Society Color Chart or Munsell Color Chart (Circle the appropriate color)

____ SECONDARY SKIN COLOR DISTRIBUTION: (See Figure 13)

1 = Eyes 2 = Eyebrows 3 = Splashed 4 = Scattered 5 = Spectacled 6 = Stippled 7 = Other ____________________

____ SKIN TEXTURE:

1 = Smooth 2 = Rough (flaky) 3 = Netled 4 = Russetted 5 = Heavily russetted 6 = Other __________________________

____ TUBER SHAPE: (See Figure 14)

1 = Compressed 2 = Round 3 = Oval 4 = Oblong 5 = Long 6 = Other ______________________________

____ TUBER THICKNESS:

1 = Round 2 = Medium thick 3 = Slightly flattened 4 = Flattened 5 = Other _____________________________

TUBER LENGTH (mm):

AVERAGE: _______

RANGE: ______ to _______

____ STANDARD DEVIATION:

____ AVERAGE WEIGHT OF SAMPLE TAKEN:
Exhibit C (Potato)

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7. TUBER CHARACTERISTICS: (continued)

TUBER WIDTH (mm)

AVERAGE: _______

RANGE: ______ to _______

____ STANDARD DEVIATION:

____ AVERAGE WEIGHT OF SAMPLE TAKEN (g):

TUBER THICKNESS (mm):

AVERAGE: _______

RANGE: ______ to _______

____ STANDARD DEVIATION:

____ AVERAGE WEIGHT OF SAMPLE TAKEN (g):

____ TUBER EYE DEPTH:

1 = Protruding 3 = Shallow 5 = Intermediate 7 = Deep 9 = Very deep

____ TUBER LATERAL EYES:

1 = Protruding 3 = Shallow 5 = Intermediate 7 = Deep 9 = Very deep

NUMBER EYE/TUBER:

AVERAGE: _______

RANGE: ______ to _______

____ DISTRIBUTION OF TUBER EYES:

1 = Predominantly apical 2 = Evenly distributed

____ PROMINENCE OF TUBER EYEBROWS:

1= Absent 2 = Slight prominence 3 = Medium prominence 4 = Very prominent 5 = Other _________________________

 

 ____ PREDOMINANT TUBER FLESH COLOR

1 = White 2 = Light Yellow 3 = Yellow 4 = Buff 5 = Tan 6 = Brown 7 = Pink 8 = Red 9 = Purplish-red 

10 = Purple 11 = Dark purple-black 12 = Other ________________________________

____ PRIMARY TUBER FLESH COLOR CHART VALUE: Royal Horticulture Society Color Chart or Munsell Color Chart (Circle the appropriate color chart)

____ SECONDARY TUBER FLESH COLOR:

1 = Absent 2 = Present, please describe: ____________________________________________________________

____ SECONDARY TUBER FLESH COLOR CHART VALUE: Royal Horticulture Society Color Chart or Munsell Color Chart (Circle the appropriate color 

chart)

____ NUMBER OF TUBERS/PLANT:

1 = Low (<8 ) 2 = Medium (8-15) 3 = High (>15)

8. DISEASES CHARACTERISTICS:

____ DISEASES REACTION: 0 = Not Tested 1 = Highly Resistant 2 = Resistant Few Symptoms 3 = Resistance Few Lessions in Number and S

4 = Moderately Resistance 5 = Intermedia Susceptible 6 = Moderate Susceptible 7 = Susceptible 9 = Highly Susceptible

____ LATE BLIGHT: (Phytophthora)

____ EARLY BLIGHT: (Alternaria)

____ SOFT ROT (Erwinia)

____ COMMON SCAB (Streptomyces)

____ POWDERY SCAB (Spongospora)

____ DRY ROT (Fusarium)

____ POTATO LEAF ROLL VIRUS (PLRV)

____ POTATO VIRUS X (PVX)

____ POTATO VIRUS Y (PVY)
Exhibit C (Potato)

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8. DISEASES CHARACTERISTICS: (continued)

____ POTATO VIRUS M (PVM)

____ POTATO VIRUS A (PVA)

____ GOLDEN NEMATODE (Globodera)

____ ROOT – KNOT NEMATODE (Meloidogyne)

____ OTHER DISEASE _______________________________________________________________

____ PHYSIOLOGICAL DISORDER

1 = Malformed shape 2 = Tuber cracking 3 = Feathering 4 = Hollow heart 5 = Internal necrosis 6 = Blackheart 7 = Internal sprouting

8 = Other __________________________________ 

9. PESTS CHARACTERISTICS:

____ PEST REACTION: 0 = Not Tested 1 = Highly Resistant 2 = Resistant Few Symptoms 3 = Resistance Few Lessions in Number and Size 

4 = Moderately Resistance 5 = Intermedia Susceptible 6 = Moderate Susceptible 7 = Susceptible 9 = Highly Susceptible

____ COLORADO POTATO BEETLE (CPB) (Leptinotarsa)

____ GREEN PEACH APHID (Myzus)

____ OTHER: ____________________

____ OTHER:

10. GENE TRAITS: 

____ INSERTION OF GENES: 1 = YES 2 = NO

IF YES, describe the gene(s) introduced or attach information:

________________________________________________________________________________________________________________

________________________________________________________________________________________________________________

________________________________________________________________________________________________________________

________________________________________________________________________________________________________________

11. QUALITY CHARACTERISTICS:

____ CHIEF MARKET:

SPECIFIC GRAVITY (wt. air/wt. air – wt. water)

1 = <1.060 2 = 1.060-1.069 3 = 1.070-1.079 4 = 1.080-1.089 5 = >1.090

____ TOTAL GLYCOALKALOID CONTENT (mg./100 g. fresh tuber)

OTHER QUALITY CHARACTERISTICS: Describe any other quality characteristics that may aid in identification, (e.g., chip-processing, french fry processing, 

baking, boiling, after-cooking darkening). Please attach data and corresponding protocol.

________________________________________________________________________________________________________________

________________________________________________________________________________________________________________

________________________________________________________________________________________________________________

________________________________________________________________________________________________________________

12. CHEMICAL IDENTIFICATION:

Describe chemical traits of the candidate variety that aid in its identification (e.g., protien or DSN electrophoresis). Please attach data and the corresponding 

protocol.

________________________________________________________________________________________________________________

________________________________________________________________________________________________________________

________________________________________________________________________________________________________________

________________________________________________________________________________________________________________
Exhibit C (Potato)

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13. FINGER PRINTING MARKERS:

____ ISOZYMES 1 = YES 2 = NO

IF YES, attach information

14. ____ DNA PROFILE: 1 = YES 2 = NO

IF YES, attach information

15. ADDDITIONAL COMMENTS AND CHARACTERISTICS:

Include any additional descriptors that would be useful in distringuishing the candidate variety.

________________________________________________________________________________________________________________

________________________________________________________________________________________________________________

________________________________________________________________________________________________________________

________________________________________________________________________________________________________________

________________________________________________________________________________________________________________

________________________________________________________________________________________________________________
Exhibit C (Potato)

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Exhibit C (Potato)

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General structures Medium stipular leaf Large stipular leaf Small stipular leaf 

Figure 2: Growth Habit

Figure 3: Stem Wings

Figure 4: Leaf Sillhouette

Figure 5: Leaf Stipules

Erect Semi Erect Spreading

Weak Medium Strong

Closed Medium Open

main stem

pediole

stipular leaf

main stem
Exhibit C (Potato)

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Figure 6: Leaf Dissection

Terminal leaflet

Leaflets

primary

lateral

leaflets

rachis

2° and 3°

petiole

Figure 7: Terminal Leaflet Shape/Primary Leaflet Shape

Figure 8: Terminal Leaflet Shape of Tip/Primary Leaflet Shape of Tip

Narrowly 

Ovate

Medium 

Ovate

Broadly 

Ovate

Lanceolate Elliptical Obovate Oblong

Acute Cuspidate Acuminate Obtuse
Exhibit C (Potato)

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Figure 9: Terminal Leaflet Shape of Base/Primary Leafelet Shape of Base

Figure 10: Corolla Shape

Stellate Semi-stellate Pentagonal

L > b L = b L < b

Rotate Very rotate

L << b L <<< b

Figure 11: Anther Shape

 

Cuneate

Acute

Obtuse

Cordate Truncate Lobed

L

Broad cone Narrow cone Pear-shape cone Loose
Exhibit C (Potato)

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Figure 12: Stigma Shape

 

Figure 13: Distribution of Secondary Skin Tuber Color

Figure 14: Tuber Shape

References:

Huaman, Z. 1986. Systematic botany and morphology of the potato. Technical information Bulletin 6. International 

Potato Center, Lima, Peru.

Huaman, Z., Williams, J.T., Salhuana, W. and Vincent, L. Descriptors for the cultivated potato and the maintenance 

and distribution of germplasm collections. 1977. International Board for Plant Genetic Resources. Rome, Italy.

Potato (Solanum tuberosum L.) Guidelines for the conduct of tests for distinctness, uniformity and stability. 

International union for the protection of new varieties of plants (UPOV). 2004-03-31.

Eyes Eyebrows Splashed Scattered Spectacled Stippled

Capitate Clavate Bi-lobed

Compressed Round Oval Oblong Long