US Corn Tightens Grip on South Korea as Disease Risks Cloud Feed Demand

US corn is consolidating a record foothold in South Korea, but disease-driven feed demand risks, wheat substitution and a weak Korean won are limiting upside for exporters despite broadly firm global corn benchmarks.

South Korea has locked in large US corn volumes through mid-2026, underpinning seaborne demand and supporting the US export program even as domestic feed consumption softens. At the same time, simultaneous outbreaks of avian influenza, African swine fever and foot-and-mouth disease are curbing herd rebuilding and introducing volatility into near-term feed usage. With global wheat supplies ample and the won still weak, Korean feed mills are poised to fine-tune corn–wheat ratios on price spreads, while new genetically engineered (GE) labelling rules add longer-term uncertainty for US corn in the food segment.

📈 Prices

International corn prices in US dollars have eased over the past two years, but won-denominated import costs for Korean buyers have risen sharply, eroding feed mill margins rather than volumes. The import price per kilogram of feed corn in South Korea climbed from roughly 257 won in early 2024 to 348 won by January 2026, despite a fall in CIF dollar prices from about USD 344/mt to USD 235/mt over the same period.

Globally, corn benchmarks remain under mild upward pressure. Recent data show CBOT corn futures trading modestly above levels seen a year earlier, while Euronext corn has moved higher on expectations of tighter 2026 supply and higher energy costs, with recent indications around EUR 210/mt versus roughly EUR 202/mt a month earlier.

Product	Origin	Location / Terms	Latest Price (EUR/kg)	1-week Change (EUR/kg)
Corn, yellow	France	Paris, FOB	0.24	+0.02
Corn, feed grade	Ukraine	Odesa, FCA	0.24	0.00
Corn, bulk	Ukraine	Odesa, FOB	0.18	0.00

🌍 Supply & Demand

South Korea relies almost entirely on imports for its grain and feed needs, and US corn has captured a record share of this strategic market. In marketing year (MY) 2024/25, the United States supplied 53% of Korean corn imports, the highest share on record, and FAS Seoul expects the US to remain the dominant supplier through MY 2025/26 and beyond. As of mid-March 2026, Korean buyers had already contracted 6.7 million metric tonnes (MMT) of US corn for MY 2025/26, with import data showing US origin accounting for 65% of total Korean corn imports in the first four months of the marketing year and 2.4 MMT delivered through January 2026.

Purchasing for Korean feed corn deliveries through June 2026 is already largely complete, with traders reporting that over 90% of February–June arrivals will be of US origin. This front-loaded buying underpins US export flows in the next 30–90 days, even as domestic Korean feed use loses momentum. Over a 6–12 month horizon, total Korean corn imports are forecast to edge down slightly in MY 2026/27 to 11.2 MMT, reflecting smaller animal inventories and a rising share of feed wheat in rations.

📊 Fundamentals: Diseases, Substitution & Policy

Three livestock diseases cap feed demand

South Korea’s compound feed use has plateaued around 21 MMT annually as disease pressure in the livestock sector has intensified. Since autumn 2025, three major diseases — highly pathogenic avian influenza (HPAI), African swine fever (ASF) and foot-and-mouth disease (FMD) — have simultaneously weighed on poultry, swine and cattle herds. Nearly 10 million birds have been culled in affected regions through mid-March 2026, while ASF has already recorded 24 cases in 2026, surpassing the combined 17 cases reported over the previous two years and leading to the culling of about 150,000 pigs. FMD has hit Hanwoo cattle herds for a second consecutive year, with culling at multiple farms in January and February 2026, and latest surveillance data confirm continued ASF activity into early April.

These outbreaks are curbing herd rebuilding and creating irregular, stop‑and‑go feed buying patterns. In the near term, this translates into softer growth — or even a mild decline — in corn-based feed demand, particularly in the poultry sector where HPAI has had the largest impact. However, poultry’s short production cycle also means that recovery in bird numbers could quickly restore corn usage once disease control stabilizes.

Feed wheat competition intensifies

Global wheat supplies are comfortable, and feed wheat is gradually regaining competitiveness against corn in Korean rations. The wheat inclusion rate in compound feed slipped from 9.2% in MY 2023/24 to 7.9% in 2024/25 when corn was more price‑competitive, but the two grains remain close substitutes. US feed wheat exports to South Korea surged to 1.0 MMT in MY 2024/25, securing a 62% share of the feed wheat market, while US milling wheat sales for MY 2025/26 delivery reached 1.84 MMT by mid‑March 2026, underpinned by strong demand from the instant noodle sector, whose exports exceeded USD 1.5 billion in 2025.

Looking ahead to MY 2026/27, FAS Seoul expects feed wheat to partially displace feed corn in Korean compound feed production when relative prices favour wheat. For US corn, this means that while total Korean import volumes may dip modestly, the competitive threat comes more from intra‑US grain competition (corn vs. wheat) than from rival origins, given the entrenched US position in both commodities.

FX and regulatory headwinds

A persistently weak Korean won has raised local-currency input costs for feed mills, even as global grain prices in dollars have eased. This FX squeeze has mainly compressed margins rather than reducing import volumes, as there are no viable domestic substitutes for imported feed grains. Still, higher won‑denominated corn costs are incentivising mills to search aggressively for price‑driven ration optimisations, including greater wheat inclusion whenever spreads permit.

On the policy side, revised GE labelling rules passed in December 2025 broaden mandatory labelling to products with non‑detectable GE ingredients, with implementation from December 2026 for soy sauce and December 2027 for saccharides and edible oils. Food processors fear higher compliance costs and possible sourcing shifts, and there is a non‑negligible risk that some Korean manufacturers will seek non‑GE corn for food processing. Over time, this could marginally erode demand for US GE corn in the food segment, even as feed use remains largely unaffected.

🌦️ Weather & Crop Outlook

In the United States, short‑term weather outlooks for the Corn Belt indicate above‑normal temperatures across much of the Midwest in the 6–10 day period from April 20–24, 2026, with mixed precipitation signals. While some forecasters highlight a wet pattern that may delay planting in parts of the eastern Corn Belt, current conditions do not yet point to widespread yield risk, but they introduce some early‑season weather premium into futures pricing.

For South Korea, weather plays a lesser direct role in feed grain supply, given the country’s near‑total reliance on imports, but ongoing spring farming activity intersects with disease‑control efforts. Authorities are maintaining strict biosecurity and disinfection measures to limit further spread of HPAI and ASF, which remains a key uncertainty for the pace of herd recovery and, by extension, future corn demand.

📆 Market Outlook (30–90 days & 6–12 months)

Over the next 30–90 days, US corn shipments to South Korea will remain elevated as pre‑committed MY 2025/26 volumes continue to load, with arrivals heavily skewed toward US origin. Feed demand may soften modestly if disease outbreaks persist, but contract coverage and limited alternative suppliers will keep US export flows resilient. Locally, Korean mills are likely to stay well covered on nearby needs, focusing instead on managing currency risk and margin pressures rather than volume cuts.

Over a 6–12 month horizon, Korean corn imports are projected to slip slightly to about 11.2 MMT in MY 2026/27, with incremental substitution toward feed wheat and some lingering drag from smaller animal herds. US corn is expected to maintain a dominant market share, supported by price competitiveness, abundant exportable supplies and strong commercial relationships forged during the record 2024/25 cycle. However, ongoing won volatility and the coming GE labelling expansion introduce structural uncertainty for US corn in Korea’s food-processing segment, making disease management and policy implementation timelines crucial watchpoints for medium‑term demand.

🧭 Trading & Risk Management Outlook

• Exporters / producers: Use current strong Korean buying and US dominance to lock in forward sales, but hedge against downside price risk from disease‑related demand dips and potential increases in feed wheat substitution.
• Feed mills / importers: Prioritise FX hedging and margin protection strategies; closely monitor corn–wheat price spreads and be prepared to adjust inclusion rates where wheat offers a clear landed‑cost advantage.
• Food processors: Begin reviewing supply chains for potential non‑GE corn options and labelling compliance ahead of the 2026–2027 implementation dates to minimise cost shocks and reputational risk.
• Speculators: Watch for bouts of weather‑driven volatility in US corn futures during the spring planting window; disease headlines from South Korea may create short‑term demand scares but are unlikely to derail US export dominance in the Korean feed segment.

📍 3‑Day Directional Outlook (EUR-based)

• Euronext corn (EUR/mt): Bias slightly upward to sideways over the next three sessions, with weather and energy markets providing support but capped by comfortable near‑term stocks.
• EU physical yellow corn, FOB France (EUR/kg): After the recent move to around 0.24 EUR/kg, expect a broadly sideways to mildly firmer tone, tracking Euronext and CBOT.
• Black Sea feed corn, Ukraine (EUR/kg equivalent): Prices near 0.18–0.24 EUR/kg are likely to remain stable in the very short term, with geopolitical and logistics risks the main potential upside catalysts.