United States

Department of

Agriculture

Agricultural 

Marketing

Service

Fruit and

Vegetable

Programs

Fresh

Products

Branch

United States Standards

for Grades of

Table Grapes (European or

Vinifera Type)

Effective March 29, 1999

(Reprinted - April 1999)
1

United States Standards for Grades of Table Grapes (European or Vinifera

Type)

Grades

51.880 U.S. Extra Fancy Table.

51.881 U.S. Extra Fancy Export.

51.882 U.S. Fancy Table.

51.883 U.S. Fancy Export.

51.884 U.S. No. 1 Table.

51.885 U.S. No. 1 Institutional.

Tolerances

51.886 Tolerances.

Application of Tolerances

51.887 Application of tolerances.

Maturity Requirements

51.888 Maturity requirements.

Definitions

51.889 Well developed grapes.

51.890 One variety.

51.891 Uniform in appearance.

51.892 Color terms.

51.893 Firm.

51.894 Weak.

51.895 Shriveled at capstem.

51.896 Shattered.

51.897 Wet.

51.898 Decay.

51.899 Waterberry.

51.900 Sunburn.

51.901 Damage.

51.902 Fairly well filled.

51.903 Excessively tight.

51.904 Shot berries.

51.905 Dried berries.

51.906 Well developed and strong.

51.907 Diameter.

51.908 Serious damage.

51.909 Materially shriveled at capstem.

51.910 Straggly.

51.911 Container.
2

51.912 Export.

51.913 Clusters.

Metric Conversion Table

51.914 Metric conversion table.

Grades

§51.880 U.S. Extra Fancy Table. 

"U.S. Extra Fancy Table'' consists of bunches of well developed grapes of one variety, except

when designated as assorted varieties, which are uniform in appearance, well colored, and which

meet the following requirements: 

(a) Basic requirements for berries: 

(1) Mature; 

(2) Firm; 

(3) Firmly attached to capstem; 

(4) Not weak; 

(5) Not shriveled at capstem; 

(6) Not shattered; 

(7) Not split or crushed; 

(8) Not wet. 

(b) Basic requirements for bunches: 

(1) Fairly well filled; 

(2) Not excessively tight for the variety. 

(c) Basic requirements for stems: 

(1) Well developed and strong; 

(2) Not dry and brittle; 

(3) At least yellowish-green in color except for Cardinal, Robin, Exotic, and Beauty Seedless

varieties. 

(d) Berries free from: 

(1) Decay; 

(2) Waterberry; 

(3) Sunburn; 

(4) Almeria Spot. 

(e) Stems free from: 

(1) Mold; 

(2) Decay. 

(f) Berries not damaged by: 

(1) Any other cause. 

(g) Bunches not damaged by: 

(1) Shot berries; 

(2) Dried berries; 

(3) Other defective berries; 

(4) Trimming away of defective berries; 

(5) Any other cause. 

(h) Stems not damaged by: 
3

(1) Freezing; 

(2) Any other cause. 

(i) Size: 

(1) For berries: Exclusive of shot berries and dried berries, not less than 90 percent, by count, of

the berries on each bunch shall have the minimum diameters indicated for varieties as follows: 

(i) Ribier, Cardinal, Robin, Exotic, Queen, Italia Muscat, and other similar varieties

thirteen-sixteenths of an inch. 

(ii) Other varieties eleven-sixteenths of an inch. 

(2) For bunches: 

(i) Not less than one-half pound. 

(j) For tolerances see §51.886. 

§51.881 U.S. Extra Fancy Export. 

"U.S. Extra Fancy Export'' consists of grapes which meet the requirements for U.S. Extra Fancy

Table and, in addition, meet the packaging requirements set forth in §51.912.

§51.882 U.S. Fancy Table. 

"U.S. Fancy Table'' consists of bunches of well developed grapes of one variety, except when

designated as assorted varieties, which are at least reasonably well colored, uniform in appearance

when so specified in connection with the grade, and which meet the following requirements: 

(a) Basic requirements for berries: 

(1) Mature; 

(2) Firm; 

(3) Firmly attached to capstem; 

(4) Not weak; 

(5) Not shriveled at capstem; 

(6) Not shattered; 

(7) Not split or crushed; 

(8) Not wet. 

(b) Basic requirements for bunches: 

(1) Fairly well filled; 

(2) Not excessively tight for the variety. 

(c) Basic requirements for stems: 

(1) Well developed and strong; 

(2) Not dry and brittle. 

(d) Berries free from: 

(1) Decay; 

(2) Waterberry; 

(3) Sunburn; 

(4) Almeria Spot. 

(e) Stems free from: 

(1) Mold; 

(2) Decay. 

(f) Berries not damaged by: 

(1) Any other cause. 
4

(g) Bunches not damaged by: 

(1) Shot berries; 

(2) Dried berries; 

(3) Other defective berries; 

(4) Trimming away of defective berries; 

(5) Any other cause. 

(h) Stems not damaged by: 

(1) Freezing; 

(2) Any other cause. 

(i) Size: 

(1) For berries: Exclusive of shot berries and dried berries, the following percentages, by count, of

the berries on each bunch shall have the minimum diameters indicated for varieties as follows: 

(i) For Ribier, Cardinal, Robin, Exotic, Queen, Italia Muscat, and other similar varieties, 90

percent shall be at least twelve-sixteenths of an inch; 

(ii) For Thompson Seedless, Perlette, Delight, Beauty Seedless, Sugraone, Flame Seedless and

other seedless varieties, 75 percent shall be at least ten-sixteenths of an inch; and,

(iii) For other varieties 90 percent shall be at least ten-sixteenths of an inch. 

(2) For bunches: 

(i) Not less than one-fourth pound. 

(j) For tolerances see §51.886. 

§51.883 U.S. Fancy Export. 

"U.S. Fancy Export'' consists of grapes which meet the requirements for U.S. Fancy Table, except

that bunches shall weigh not less than one-half pound, and in addition meet the packaging

requirements set forth in §51.912. 

§51.884 U.S. No. 1 Table. 

"U.S. No. 1 Table'' consists of bunches of well developed grapes of one variety, except when

designated as assorted varieties, which are at least fairly well colored, uniform in appearance when

so specified in connection with the grade, and which meet the following requirements: 

(a) Basic requirements for berries: 

(1) Mature; 

(2) Firm; 

(3) Firmly attached to capstem; 

(4) Not weak; 

(5) Not materially shriveled at capstem; 

(6) Not shattered; 

(7) Not split or crushed; 

(8) Not wet. 

(b) Basic requirements for bunches: 

(1) Not straggly. 

(c) Basic requirements for stems: 

(1) Not weak, or dry and brittle. 

(d) Berries free from: 

(1) Decay; 
5

(2) Waterberry; 

(3) Sunburn. 

(e) Stems free from: 

(1) Decay; 

(2) Mold. 

(f) Berries not damaged by: 

(1) Any other cause. 

(g) Bunches not damaged by: 

(1) Shot berries; 

(2) Dried berries; 

(3) Other defective berries; 

(4) Trimming away of defective berries; 

(5) Any other cause. 

(h) Stems not damaged by: 

(1) Freezing; 

(2) Any other cause. 

(i) Size: 

(1) For berries: Exclusive of shot berries and dried berries, 75 percent, by count, of the berries on

each bunch shall have the minimum diameters indicated for varieties as follows: 

(i) Thompson Seedless, Perlette, Delight, Beauty Seedless, Sugraone, Flame Seedless and other

seedless varieties nine-sixteenths of an inch. 

(ii) Other varieties ten-sixteenths of an inch. 

(2) For bunches: 

(i) Not less than one-fourth pound. 

(j) For tolerances see §51.886. 

§51.885 U.S. No. 1 Institutional.

"U.S. No. 1 Institutional" grapes must have no less than 95 percent of the containers in the lot

legibly marked "Institutional Pack." Further requirements for this grade include grapes which

consist of clusters and/or bunches of well developed grapes of one variety, except when

designated as assorted varieties, which are at least fairly well colored, uniform in appearance when

so specified in connection with the grade, and which meet the following requirements:

(a) Basic requirements for berries:

(1) Mature;

(2) Firm;

(3) Firmly attached to capstem;

(4) Not weak;

(5) Not materially shriveled at capstem;

(6) Not shattered;

(7) Not split or crushed;

(8) Not wet.

(b) Basic requirements for stems:

(1) Not weak, or dry and brittle.

(c) Berries free from:
6

(1) Decay;

(2) Waterberry;

(3) Sunburn.

(d) Stems free from:

(1) Mold;

(2) Decay.

(e) Berries not damaged by:

(1) Any other cause.

(f) Bunches not damaged by:

(1) Shot berries;

(2) Dried berries;

(3) Other defective berries;

(4) Any other cause.

(g) Stems not damaged by:

(1) Freezing;

(2) Any other cause.

(h) Size:

(1) For berries: Exclusive of shot berries and dried berries, 75 percent, by count, of the berries on

each bunch shall have the minimum diameters indicated for varieties as follows:

(i) Thompson Seedless, Perlette, Delight, Beauty Seedless, Sugraone, Flame Seedless and other

seedless varieties nine-sixteenths of an inch.

(ii) Other varieties ten-sixteenths of an inch.

(2) For clusters/bunches: In this grade grapes shall consist of at least a two berry cluster ranging

to clusters and/or bunches of grapes not greater than five ounces in weight. See Section 51.913.

(i) For tolerances see Section 51.886.

Tolerances

§51.886 Tolerances. 

(a) No tolerances are provided in these standards for grapes which fail to meet the applicable

maturity requirements other than the allowances specified in §51.888 or in the sampling and

testing procedures of State maturity regulations. 

(b) In order to allow for variations incident to proper grading and handling in each of the

foregoing grades except U.S. No. 1 Institutional, tolerances, by weight, other than for maturity,

are provided as set forth in Tables I and II.
Shipping Point, as used in these standards, means the point of origin of the shipment in the producing area or 1

at port of loading for ship stores or overseas shipment, or, in the case of shipments from outside the continental United

States, the port of entry into the United States.

7

Table I -- Tolerances at Shipping Point1

[Percent]

Factor U.S. Extra U.S. Fancy U.S. No. 1

Fancy Table Table Table

(A) For bunches failing to meet color

 requirements --------------------------------------- 10 10 10

(B) For bunches failing to meet

 requirements for minimum diameter 

 of berries -------------------------------------------- 10 10 10

(C) For bunches failing to meet stem color

 requirements --------------------------------------- 10

(D) For offsize bunches and for bunches

 and berries failing to meet the

 remaining requirements for the grade ---------- 8 8 8

Including in (D):

 (a) For serious damage ---------------------------- 2 2 2

And, including in (a): 1⁄2 of 1 1⁄2 of 1 1⁄2 of 1

 (i) For decay ----------------------------------------

Table II Tolerances En Route or at Destination

[Percent]

Factor U.S. Extra U.S. Fancy U.S. No. 1

Fancy Table Table Table

(A) For bunches failing to meet color

 requirements --------------------------------------- 10 10 10

(B) For bunches failing to meet requirements for

 minimum diameter of berries -------------------- 10 10 10

(C) For bunches failing to meet stem color

 requirements --------------------------------------- 10

(D) For offsize bunches and for bunches

 and berries failing to meet the

 remaining requirements for the grade ---------- 12 12 12

Including in (D):

 (a) For permanent defects ------------------------- 8 8 8

 (b) For serious damage----------------------------- 4 4 4

 And, including in (b):

 (i) For serious damage by permanent defects--- 2 2 2

 (ii) For decay --------------------------------------- 1 1 1
Shipping Point, as used in these standards, means the point of origin of the shipment in the producing area or 1

at port of loading for ship stores or overseas shipment, or, in the case of shipments from outside the continental United

States, the port of entry into the United States.

8

(c) In order to allow for variations incident to proper grading and handling in the U.S. No. 1

Institutional grade only, tolerances, by weight, other than for maturity, are provided as set forth in

Tables Ia and IIa of this section.

TABLE Ia -- TOLERANCES AT SHIPPING POINT FOR U.S. NO. 1

INSTITUTIONAL GRADE ONLY 1

[Percent]

Factor U.S. No. 1 Institutional

(A) For clusters/bunches failing to meet color requirements ------------------- 10

(B) For clusters/bunches failing to meet requirements for minimum 

 diameter of berries --------------------------------------------------------------- 10

(C) For offsize clusters/bunches ----------------------------------------------------- 4

(D) For clusters/bunches and berries failing to meet the remaining 

 requirements for the grade ----------------------------------------------------- 8

Including in (D):

 (a) For serious damage ------------------------------------------------------------ 2

 And, including in (a):

 (i) For decay ------------------------------------------------------------------------ 1⁄2 of 1

TABLE IIa -- TOLERANCES EN ROUTE OR AT DESTINATION FOR

 U.S. NO. 1 INSTITUTIONAL GRADE ONLY

[Percent]

Factor U.S. No. 1 Institutional

(A) For clusters/bunches failing to meet color requirements --------------------- 10

(B) For clusters/bunches failing to meet requirements for minimum 

 diameter of berries ----------------------------------------------------------------- 10

(C) For offsize clusters/bunches ----------------------------------------------------- 4

(D) For clusters/bunches and berries failing to meet the remaining 

 requirements for the grade ------------------------------------------------------- 12

Including in (D):

 (a) For permanent defects --------------------------------------------------------- 8

 (b) For serious damage------------------------------------------------------------- 4

 And, including in (b):

 (i) For serious damage by permanent defects----------------------------------- 2

 (ii) For decay ------------------------------------------------------------------------ 1
9

Application of Tolerances

§51.887 Application of tolerances. 

The contents of the individual packages in any lot, based on sample inspection, are subject to the

following limitations: Provided, That the averages for the entire lot are within the tolerances

specified for the grade: 

(a) For tolerances of 10 percent or more, individual packages may contain not more than one and

one-half times the specified tolerance. 

(b) For a tolerance of less than 10 percent, individual packages may contain not more than double

the specified tolerance. 

§ 51.888 Maturity requirements.

(a) In the case of grapes grown in Arizona or California, "mature" means grapes in any lot shall

meet the maturity requirements for the variety as set forth in the applicable State Agricultural

Laws and Regulations referenced in this section. This incorporation by reference was approved

by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. 

Copies may be obtained from, in the case of Arizona maturity regulations, Arizona Department of

Agriculture, Citrus, Fruit and Vegetable Standardization, 1688 W. Adams, Phoenix, AZ 85007 or

in the case of California maturity regulations, California Department of Food and Agriculture,

Fruit and Vegetable Quality Control, Standardization Section, 1220 N Street, P.O. Box 942871,

Sacramento, California 94271-0001 or copies of both regulations may be inspected at USDA,

AMS, F&VD, FPB, Standardization Section, Room 2065-S, 14th and Independence Ave.,

Washington, DC 20250 or at the Office of the Federal Register, Suite 700, 800 North Capitol,

Washington, DC.

(1) Arizona maturity regulations are contained in Chapter 4 - Plant Services Division, Article 7.

Fruit And Vegetable Standardization, Section R3-4-733 Table Grape Standards, Effective January

6, 1994.

(2) California maturity regulations are contained in The California Code of Regulations, Title 3,

Subchapter 4, Fresh Fruits, Nuts and Vegetables, Article 25 Table Grapes and Raisins, February

28, 1992.

(b) Grapes subject to U.S. import regulations shall meet the maturity requirements specified in

such regulations.

(c) Grapes produced in States other than Arizona or California, or grapes imported from countries

outside the United States during periods in which U.S. import regulations do not apply, shall meet

the minimum percentage of soluble solids set forth in Table III as determined by use of a standard

hand refractometer.

Table III

Variety Percent of soluble solids

Muscat --------------------------------------------------------- 17.5

All varieties not listed in this table -------------------------- 16.5

Cardinal, Emperor, Perlette, Ribier, Olivette Blanche, Rish Baba, Red

Malaga, and similar varieties ------------- 15.5
Good characteristic color for black varieties means purple to black except that Ribier or similar varieties of grapes 1

shall have at least two-thirds of the surface of the berry showing purple to black color. 

For red varieties good characteristic color means at least two-thirds of the surface of the berry is light red through dark

red color; except, for the Tokay variety pink through dark red, and for the Cardinal variety light red through purple shall be

permitted. 

Characteristic color for black varieties means reddish-purple to black except that Ribier or similar varieties 2

of grapes shall have at least two-thirds of the surface of the berry showing reddish-purple to black color. 

For red varieties characteristic color means at least two-thirds of the surface of the berry is pink to dark red; except,

for the Tokay variety light pink through dark red and for the Cardinal variety light pink through purple color shall be

permitted.

10

(1) The minimum percentage of soluble solids for any lot shall be determined from the juice of at

least 10 percent, by weight, of whole bunches of the least mature grapes in that container which

appears to have the least mature grapes. No lot shall be considered as failing to meet these

requirements unless samples from two containers which appear to have the least mature grapes

test below the required percentage of soluble solids.

Definitions 

§51.889 Well developed grapes. 

"Well developed" grapes means grapes which are not abnormally small for the variety. 

§51.890 One variety. 

"One variety" means that the grapes show similar varietal characteristics. 

§51.891 Uniform in appearance. 

"Uniform in appearance" means that not more than one-tenth of the containers in any lot show

sufficient variation in color or size of berries to materially detract from the appearance of the

contents of the individual container, and that the stems are well developed and strong. 

§51.892 Color terms. 

The color terms "well colored," "reasonably well colored," and "fairly well colored" are defined in

Table IV.

Table IV

Color terms Black varieties Red varieties White varieties

Well colored (U.S. Extra Each bunch shall have not Each bunch shall have not less No requirement.

Fancy). less than 95 percent, by than 75 percent, by count, of

count, of berries showing berries showing good

good characteristic color. characteristic color. 1 1

Reasonably well colored Each bunch shall have not Each bunch shall have not less No requirement.

(U.S. Fancy). less than 85 percent, by than 66-2/3 percent, by count, of

count, of berries showing berries showing good

good characteristic color. characteristic color except the 1 1

Tokay and Cardinal varieties shall

have not less than 75 percent, by

count, of berries showing

characteristic color.2

Fairly well colored (U.S. Each bunch shall have not Each bunch shall have not less No

No. 1). less than 75 percent, by than 60 percent, by count, of

count, of berries showing berries showing characteristic

characteristic color. color. 2 2

requirement.
11

§51.893 Firm. 

"Firm" means that the berry does not yield more than slightly to moderate pressure and is not

flabby or wilted. 

§51.894 Weak. 

"Weak" means that individual berries are somewhat translucent, watery and soft, may have

relatively low sugar content, inferior flavor, or are of poor keeping quality. 

§51.895 Shriveled at capstem. 

"Shriveled at capstem" means that the berry shows more than slight wrinkling of the skin

surrounding the capstem. 

§51.896 Shattered. 

"Shattered" means that the berry is separated from the bunch and may or may not have the

capstem attached. 

§51.897 Wet. 

"Wet" means that the grapes are wet from moisture from crushed, leaking, or decayed berries or

from rain. Grapes which are moist from dew or other moisture condensation such as that resulting

from removing grapes from a refrigerator car or cold storage to a warmer location shall not be

considered as wet. 

§51.898 Decay. 

"Decay" means any soft breakdown of the flesh or skin of the berry resulting from bacterial or

fungus infection. Slight surface development of green mold (Cladosporium) shall not be

considered decay. 

§51.899 Waterberry. 

"Waterberry" means a watery, soft, or flabby condition of the berry. Affected berries are low in

sugar content, have tender skins, and are easily crushed. This is an advanced or more pronounced

stage of the condition referred to as "weak''. 

§51.900 Sunburn. 

"Sunburn" means injury to the berry caused by exposure to the sun, including "sulphur burn,''

usually occurring as a sunken and discolored or dried area on the exposed surface. 

§51.901 Damage. 

"Damage" means any specific defect described in this section; or an equally objectionable variation

of any one of these defects, or any other defect, or any combination of defects which materially

detracts from the appearance, or the edible or marketing quality of the individual berry, the

appearance of the bunch as a whole, or the marketing quality of the stems. 

(a) The following shall be considered as damage to the individual berry: 

(1) Scarring such as that caused by thrips, mildew, rubs, and similar injuries when materially

detracting from the appearance of the berry; 

(2) Discoloration when any light brown, tan, or darker discoloration of the skin materially detracts

from the appearance of the berry: Provided, That "sunkissed'' berries of the white Malaga variety

which show discoloration of amber or light brown color shall not be considered as damaged.

"Buckskin'' berries of the Tokay variety, and similar injury to other varieties, shall be considered

as damaged by discoloration; 

(3) Heat when the flesh of the berry is affected; 

(4) Almeria Spot when any spot is distinctly sunken or dark in color; 

(5) Mildew when active powdery mildew is present; 

(6) Freezing when the berry is frozen or when the flesh of the berry is affected by freezing; 
12

(7) Insect injury when penetrating the skin of the berry or when there is noticeable insect

infestation on the bunch; when mealybug residue or aphis honeydew are present in noticeable

amounts; or when leafhopper residue materially detracts from the appearance of the individual

berry or of the bunch. 

(b) The following shall be considered as damage to stems: 

(1) Active powdery mildew or any other disease when present on the stems to the extent that it

detracts from the appearance of the bunch or when scars caused by mildew or other disease

constrict or weaken any part of the main or lateral stems; and, 

(2) Freezing when the stems are frozen or the capstems are swollen or dried, or when the main or

lateral stems are water-soaked and limp, or dried, as a result of freezing. 

§51.902 Fairly well filled. 

"Fairly well filled" means that the berries are reasonably closely spaced on main and lateral stems

and that the bunch is not very loose or stringy. 

§51.903 Excessively tight. 

"Excessively tight" means that the berries are so wedged together that the bunch is extremely

compact for the variety and resulting distorted berries materially detract from the appearance of

the bunch. 

§51.904 Shot berries. 

"Shot berries" means very small berries resulting from insufficient pollination, usually seedless in

those varieties which normally develop seeds. 

§51.905 Dried berries. 

"Dried berries" means berries which are dry and shriveled to the extent that practically no

moisture is present. 

§51.906 Well developed and strong. 

"Well developed and strong" means that the main and lateral stems are firm, fibrous, and pliable;

not distinctly immature or spindly or threadlike at time of packing. 

§51.907 Diameter. 

"Diameter" means the greatest dimension of the berry taken at right angles to a line running from

the stem to the blossom end. 

§51.908 Serious damage. 

"Serious damage" means any defect or any combination of defects which seriously detracts from

the appearance, or the edible or marketing quality of the grapes and includes berries which are

split, crushed, wet, affected by decay or waterberry, or affected by heat or freezing. Grapes which

show healed cracks at the blossom and shall not be considered as seriously damaged. 

§51.909 Materially shriveled at capstem. 

"Materially shriveled at capstem" means that the skin of the berry is definitely wrinkled adjacent to

the capstem and the surface is materially sunken. 

§51.910 Straggly. 

"Straggly" means that the berries are so widely spaced on main and lateral stems that the bunch is

distinctly open or very stemmy or stringy in structure. 

§51.911 Container.

"Container" as used in these standards shall, for the purposes of determining maturity and other

factors of grade of grapes in packages containing 5 pounds or less, mean the master container in

which the individual packages are packed for shipment.

§51.912 Export. 
13

When designated as Export, grapes shall be packed with any of the customary protective materials

such as cushions, liners, or wraps, or properly packed in sawdust or granulated cork. The

so-called "semi-sawdust packs'' which are cushioned and/or covered with sawdust are not

approved as protective packaging for export.

§51.913 Clusters.

"Clusters" as used in these standards in reference to the U.S. No. 1 Institutional grade only shall

be defined as two or more berries sharing a common point of attachment.

Metric Conversion Table 

§51.914 Metric conversion table.

Inches Millimeters

 (mm)

3/16 equals 4.8

8/16 equals 12.7

9/16 equals 14.3

10/16 equals 15.9

11/16 equals 17.5

12/16 equals 19.1

13/16 equals 20.6

14/16 equals 22.2

15/16 equals 23.8

1 equals 25.4

Pounds Grams

1/4 equals 113.4

1/2 equals 226.8

3/4 equals 340.2

1 equals 453.6

2 equals 907.2

3 equals 1,360.8

4 equals 1,814.4

5 equals 2,268.0

10 equals 4,536.0
Varieties listed, when tested by refractometer, are mature when meeting or exceeding the 1

specified soluble solids. All varieties, regardless of refractometer reading, are mature at 18 to 1 or higher

titration ratio.

All varieties, when tested by temperature compensated hand refractometer, are mature when 2

meeting or exceeding the specified soluble solids percentage. The Thompson Seedless at 15 percent or

more soluble solids and Perlette or Sugraone at 14 percent or more soluble solids and all other varieties

regardless of refractometer reading are mature, provided that the juice contains a minimum of 20 parts

soluble solids to every part acid in the juice as determined by titration. Thompson Seedless below 15

percent soluble solids, and Perlette or Sugraone below 14 percent soluble solids may not be titrated. They

are immature with out further testing. The California Agricultural Code should be consulted for official

sampling guidelines and titration procedures.

All varieties, when tested by refractometer, are mature when meeting or exceeding the specified 3

soluble solids.

14

Table Grape Maturity Chart

Percent

Soluble

Solids

Arizona Agricultural

Code1

California Agricultural Code U.S. Standards for Origins 2

Outside California & Arizona3

17.5 All white varieties of Muscat and White Malaga grown Muscat

NW of San Gorgonio Pass

17.0 Thompson Seedless grown NW of San Gorgonio Pass

16.5 All varieties not listed elsewhere in this column All varieties not listed in this

column

16.0 Thompson Seedless

Flame Seedless

15.5 Beauty Seedless grown SE of San Gorgonio Pass. Cardinal, Emperor, Perlette,

Berenda Red, Cardinal, Imperial Cardinal, Richards Ribier, Olivette, Blanche,

Black, and Robin grown NW of San Gorgonio Pass Rish Baba, Red Malaga, and

Blackrose, Isabella Regia, Bleu Grau, Khalili, Burger,

Perlette, California Concord, Persian 23, Concord,

Pierce Isabella, Dattier de Beyrouth, Queen, Delight,

Red Malaga, Dizmar, Ribier, Drodelabi, Servian Blue,

Emperor, Sugraone, Fresno Beauty

similar varieties.

15.0 Perlette, Beauty Seedless

14.5 Cardinal, Robin, Berenda Red, Imperial Cardinal, and

Richards Black grown SE of San Gorgonio Pass; and 

Lady finger, Rish Baba, Khandahar, Olivette Blanche

14.0 Exotic Exotic