Crop Information

Select a link to the left to find more information about a particular crop kind.


Crop Standards

Cereal Grains and Identity Preservation Crops


Cereal Varieties and Classes Eligible for Oregon Certification

Other Information

Fees and Deadlines

Documentation for Bulk Shipments of Small Grains

Designating Field Boundaries for Isolation and Excluded Areas - A Guideline for Small Grains

Grass & Legumes

Crop Standards

Crop standards for Grasses, Legumes, and Miscellaneous Crops

Fees and Deadlines

Current Certification Fees and Deadlines


Varieities eligible for Certification in Oregon


Mint Directory and Advisory Committee

Directory of Oregon Mint Rootstock (pdf)

Mint Advisory Committee (pdf)

Mint Standards

Oregon Peppermint and Spearmint Rootstock Certification Standards (pdf)

Other Information

Mint Field Inspection Application (pdf)

Mint Greenhouse Inspection Application (pdf)


Crop Standards

Oregon Certified Seed Potato Crop Standards Handbook (pdf)

Post-Harvest Testing and Inspection Options (pdf)

Grower Directory

Seed Grower Contact List

Seed Report and Directory of Growers (pdf)

Field Readings

Oregon Certified Seed Potato Field Readings and Statistics (pdf)

Applications and Forms

Field Inspection Application Form

Seed Farm Requirement Form (pdf)

Inspection of Uncertified Potato Fields (pdf) (aka "Bacterial Ring Rot Inspection")

Latent Virus Testing Application (pdf)

Grower Tag Order Form (pdf) 

Grower Tag Order Form (writable pdf)

Oregon Potato Information

Oregon Seed Production and Methods

Potato Handling, Cutting, and Sanitation

Selecting and Buying Seed

Variety Information

Potato Certification - National Level

Other Information

BRR Diagnostics Protocol (pdf)

Early Generation Seed Potato Production and Certification (pdf)

Field Planting Terminology Comparison Table (pdf)

OSCS Potato Certification Summary (pdf)

Directions to Potato Greenhouse (pdf)

       Winter Grow-out Process in Pictures

        UNECE Booklet: Guide to Seed Potato Diseases, Pests, and Defects


Whoever can make two ears of corn or two blades of grass to grow where only one grew before, would deserve better of mankind and do more essential service to his country than the whole race of politicians combined.-- Jonathon Swift (1667-1745)


Selecting suitable varieties is an essential first step in any successful potato operation. Varieties must not only suit the intended market but also be well adapted to local growing conditions. Hundreds of varieties are potentially available to potato growers but as few as five probably account for 90% of the U.S. acreage. The leading variety, Russet Burbank, still provides about 40% of the U.S. production.

Varieties differ in a number of characteristics including: yield; skin and flesh color; tuber shape and eye depth; time of maturity; disease and pest resistance; carbohydrate composition; usage potential; dormancy and storability; and any number of additional particulars. Processors typically specify varieties in grower contracts, but not always. Fresh market growers, on the other hand, are free to choose.

Potato varieties have traditionally been categorized according to shape and color as Round Whites, Russets, or Reds. Recently, "Specialty" and "Gourmet" have entered the potato vocabulary to describe almost any variety not fitting into the three major divisions. Broadly speaking, round-white varieties are used for chipping and, to a lesser extent, as tablestock in central and eastern states. Reds and specialty gourmet varieties are used exclusively for the fresh market. Russets, which tend to produce oblong tubers, are used for both frozen processing and fresh market.

The carbohydrate (starch and sugar) composition of tubers plays an important role in determining variety usage. Processing varieties, for example, must have relatively high starch and low reducing (glucose/fructose) sugar levels. Starch content is directly related to specific gravity or dry matter in tubers. Typically, 60-80% of the dry matter is present as starch. Therefore, high-gravity or high-solids tubers contain high levels of starch.

Relationship Between Tuber Dry Matter and Optimum Use
Specific Gravity Dry Matter, % Texture Typical Uses
Below 1.060
(very low)
Below 16.2 Very soggy Pan frying, salads, canning
16.2-18.1 Soggy Pan frying, salads, boiling, canning
18.2-20.2 Waxy Boiling, mashing; fair to good for chip processing and canning
20.3-22.3 Mealy, dry Baking, chip processing, frozen french fry processing; some cultivars tend to slough when boiled
Above 1.089
(very high)
Above 22.3 Very mealy or dry Baking, frozen french fry processing, chip processing; tendency to produce brittle chips and to slough when boiled

Adapted from: Mosley, A.R. and R.W. Chase. 1993. Selecting Cultivars and Obtaining Healthy Seed Lots. In: Potato Health Management, APS Press, 1993. Pp. 19-27.


Starch has profound effects on product texture and oil consumption during processing. Frying drives much of the water out of chips, for example, and replaces it with oil. Therefore, low dry matter/high water tubers tend to absorb more oil, which is typically the most expensive component of fries, and become more soggy and/or oily.

In contrast to starch, which primarily affects product texture and oil content, reducing sugars (primarily glucose and fructose) play a critical role in the processed color of potato chips and french fries. Even very low levels of sugar cause chips and fries to turn dark brown during frying. For that reason, varieties intended for processing either as chips or fries, especially during the winter and early spring, must have low levels of reducing sugars both in the field and storage. Sugar levels typically make up less than 3% of total tuber dry matter.

Native & Naturalized Plant Species

AOSCA Standards, Guidelines, and Publications

AOSCA Pre-Variety Germplasm Certification Standards (pdf)

AOSCA Nomenclature and Labeling for Plant Germplasm Types (pdf)

AOSCA Guidelines for Permitting & Certification of Wildland Collected Seed (pdf)

AOSCA Native Plant Connection (pdf)

Tree Seed

As of April, 2009, applications for certification of Forest Reproductive Material ("tree seed") in Oregon and Washington are submitted to the Washington State Crop Improvement Association, 1610 NE Eastgate Blvd, Suite 610, Pullman, WA 99163.

Other Information

General Certification Handbook (pdf)

Crop Standards


Field Corn
Small Grains
Identity Preservation

Cruciferous Crops

           Ethiopian Cabbage (uses Mustard standards)
                      Hybrid annual rape / type canola
                      Oil rape
           Swede (Rutabaga)


           Weeping alkaligrass
           Colonial bentgrass
           Creeping bentgrass
           Idaho bentgrass
           Penncross Creeping bentgrass
           Redtop bentgrass
           Vegetatively propagated bentgrass
           Velvet bentgrass
           Big bluegrass
           Creeping bluegrass
           Kentucky bluegrass
           Rough bluegrass
Crested dogtail
Crested hairgrass
           Annual fescue
           Chewings and Slender Creeping Red fescue
           Hard, Sheep, Blue, and Idaho Fescue
           Meadow fescue
           Strong Creeping Red fescue
           Tall fescue
            Festulolium 2x/4x
            Festulolium 6x
Indian ricegrass
Meadow foxtail
Reed canarygrass
           Annual ryegrass    -     Isolation and Field History Information
           Fluorescence test of ryegrass
           Intermediate ryegrass
           Perennial ryegrass
Seashore paspalum
Tufted hairgrass
           Altai wildrye
           Basin wildrye
           Blue wildrye



                      Arrowleaf clover                    
                      Balansa clover
                      Ball clover
                      Berseem clover
                      Crimson clover
                      Red clover
                      Rose clover
                      Subterranean clover
                      White clover

           Field bean
           Utah sweetvetch


           Blue flax
           Lewis flax
           Prairie flax
Little burnet
Rocky Mountain Penstemon
Sugar beet
           Hybrid sunflower

Native & Naturalized Plant Species

Forest reproductive material
Native & Naturalized Plant seed standards