Colorado to Implement New Seed Potato Testing in 2027
State regulators will use direct tuber testing to manage Potato Virus Y levels in local seed crops.
Updated on Oct. 31, 2026 in Agriculture
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Starting in 2027, Colorado will implement a new direct tuber testing regulation for seed potatoes to manage virus levels. The initiative aims to reduce the presence of Potato Virus Y in crops across the state.
Why it matters
Reducing Potato Virus Y is critical for maintaining the quality and viability of seed potatoes, as commercial growers must adhere to strict virus standards. The new testing protocol offers a more efficient method for ensuring seeds meet safety requirements.
Commercial seed saved for planting must meet a 25% virus standard under the new regulatory framework. This requirement applies to dormant potato varieties including Canela Russet and Waneta.
The players
Colorado Potato Certification Service
This agency manages agricultural standards and conducts post-harvest virus testing for potato growers in the region.
The details
Growers in the San Luis Valley have long utilized vine desiccation between late July and mid-August to limit aphid-spread viruses, a practice complicated by hot and dry conditions in 2026. The new regulation allows for direct testing of dormant tubers to proactively identify and control Potato Virus Y levels.
Timeline
Late July 2026 - mid-August 2026: Growers desiccated potato vines.
Fall 2026: Seed potato harvest occurred despite rain delays.
December 2026: Post-harvest virus testing takes place in Hawaii.
Before Christmas 2026: Preliminary test results will be sent to growers.
2027: New direct tuber testing rule implementation begins.
Market Landscape
The new direct tuber testing protocol follows a pattern set by the 25% virus standard for seed potatoes to ensure commercial crop health. By formalizing this testing, Colorado aims to maintain the market competitiveness of its seed stock against national agricultural producers.
Commercial farmers and growers in the San Luis Valley will need to adapt their operations to comply with the updated testing requirements by 2027. These changes help ensure that local seed potatoes remain viable for planting while meeting mandatory safety thresholds.
The takeaway
Proactive virus testing helps protect the long-term viability of the state's potato industry by limiting the spread of harmful pathogens. Growers should prepare for the new testing procedures before the 2027 implementation date to ensure continuous certification of their seed varieties.
Further reading
For more information on regional crop standards, visit the Agriculture section.
Source note: This article includes information reported by The Valley Courier.
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Should the government mandate strict virus testing for commercial seed crops to ensure quality?
