Storage under stress: How climate change is rewriting the rules for potato dormancy and disease risk

Storage is no longer a question of what happens once the doors close — a reframing that runs through the entire piece, Potato News Today argues. Hotter growing seasons, irregular rainfall, drought stress, waterlogging, heat waves and delayed harvests are described as changing the physiological condition of the crop before it ever reaches a storage building. The publication's framing is blunt — the potato store is becoming, in its words, a frontline climate-risk management system, not a passive holding period between harvest and sale.

That shift matters because it relocates the starting point of storage decision-making. Instead of asking how to manage temperature and humidity inside a building, the analysis argues the industry must first ask what a given lot experienced in the field, and only then decide how to store it.

A central claim in the piece is that dormancy is commonly treated as a stable characteristic of a variety, when it is in fact shaped by growing conditions, maturity, harvest timing and storage environment as much as by genetics. Potato News Today states that crops grown under heat or drought stress may enter storage physiologically older, with shorter dormancy and earlier sprouting — outcomes that can also compromise processing quality and cause seed potatoes to age faster than intended.

The practical consequence, according to the piece, is that storage programmes built around expected dormancy behavior — ventilation plans, cooling schedules, shipment timing, processing schedules — can be undermined if a crop breaks dormancy earlier than assumed.

Climate-driven dormancy changes are linked to a separate, already-difficult transition: the loss of CIPC as a sprout suppressant in Europe and Great Britain, the analysis argues. Potato News Today describes the post-CIPC period as having already converted sprout suppression from a familiar chemical programme into a more complex management task, one where alternatives can work but require careful use and a clear understanding of the market destination for the crop.

Layering climate stress on top of that transition, the piece argues, means shortened dormancy will require sprout-control tools to work harder, and storage cannot be run on habit. It calls for better lot assessment before storage, closer monitoring during curing, and a greater willingness to move risky lots earlier rather than holding them to late season.

Storage diseases themselves are not new, Potato News Today notes, but their behavior may become more unpredictable under climate pressure. Wet harvests, high soil moisture, heat stress, skin damage, bruising and immature tubers are all cited as factors that raise the risk of breakdown once potatoes are in storage — meaning disease management effectively begins in the field, through seed quality, rotation, disease scouting and harvest conditions, well before a pile is closed up.

The piece's recommendation is more aggressive risk sorting: treating risky fields, damaged lots, or crops harvested under poor conditions as candidates for shorter storage plans or earlier market movement rather than assuming every lot can be held equally.

Despite the emphasis on new pressures, the basic pillars of storage — temperature, humidity, air movement and sanitation — remain unchanged, Potato News Today states explicitly. What is changing, the piece argues, is the tolerance for error: a crop already under climate stress has less capacity to absorb hot spots, condensation, poor airflow or unmanaged CO2 before quality is lost, even when a store looks calm from the outside.

This is presented as an argument for reassessing storage infrastructure itself — insulation, ventilation design, refrigeration capacity and control systems — since many stores were built for conditions the piece suggests may no longer be typical, without necessarily requiring wholesale replacement of existing buildings.

The final thread in the analysis concerns the role of technology and the people who use it. Potato News Today frames sensors, dashboards and automated controls as tools that should support experienced storage managers rather than replace them, warning that a system producing data without practical guidance can create confusion instead of clarity.

The piece closes by naming the human cost directly: growers, storage managers and technical advisors are described as carrying large financial consequences on individual calls — whether to hold or move a stressed lot, delay or accelerate cooling, or open a risky pile — and it calls for more training, technical support and open industry discussion of storage failures as well as successes.