Crop Disease in Canada 2026
Crop disease in Canada remains one of the most persistent threats to the country’s $30 billion-plus agricultural export economy, with wheat, canola, and potato growers across Alberta, Saskatchewan, Manitoba, and Atlantic Canada all reporting measurable yield losses tied to fungal, bacterial, and viral pathogens this season. From stripe rust tearing through Prairie wheat fields to blackleg and verticillium stripe reshaping canola management decisions, the 2025-2026 growing cycle has produced some of the most detailed disease-monitoring data seen in years, drawn from provincial disease surveys, the Canadian Grain Commission, Agriculture and Agri-Food Canada (AAFC), Statistics Canada, and the Crop Protection Network.
This report compiles the latest verified statistics on crop disease in Canada 2026, covering wheat foliar and head diseases, canola pathogens like clubroot and sclerotinia stem rot, and potato-specific threats such as late blight. Every figure below is sourced from government agriculture ministries, national research bodies, or peer-reviewed disease-monitoring networks, giving growers, agronomists, and policymakers a reliable snapshot of where disease pressure is rising, where it is easing, and what it means for Canadian crop production heading into the rest of 2026.
Interesting Facts About Crop Disease in Canada 2026
| Fact | Data Point |
|---|---|
| Total wheat disease loss (Western Canada, 2025) | 107.3 million bushels, or 7.4% of regional production |
| Top wheat disease by loss volume | Stripe rust, responsible for nearly 19.8 million bushels lost |
| Alberta blackleg incidence in 2025 | 45% of canola plants surveyed — the highest on record |
| Alberta clubroot-affected canola fields (cumulative) | More than 4,300 fields since 2003 |
| Manitoba verticillium stripe prevalence | 73% of surveyed fields in 2025, up from 60% in 2024 |
| Canadian potato production, 2025 | 125.8 million hundredweight, down 0.9% year-over-year |
| P.E.I. potato production decline (2025) | -15.9% due to eastern drought conditions |
| Late blight fungicide resistance rate | 95% of sampled Phytophthora infestans strains resistant to metalaxyl |
| Saskatchewan blackleg incidence, 2025 | 11% across all surveyed fields, down from 2024’s record high |
| Total combined US-Canada wheat disease losses (2025) | 205.0 million bushels, valued near $531.2 million USD |
Source: Crop Protection Network, Canola Council of Canada, Statistics Canada, Agriculture and Agri-Food Canada, Government of Saskatchewan, Government of Manitoba.
Taken together, these numbers paint a picture of a growing season shaped by extremes — drought stress in parts of the east, disease-favourable humidity in parts of the Prairies, and a stripe rust outbreak that ended up being the single costliest wheat pathogen of the year. Stripe rust alone accounted for a bigger bushel loss than the next three foliar diseases combined, a reversal from earlier-season forecasts that had rated the disease’s risk as comparatively low. Meanwhile, canola growers experienced a split story: blackleg and sclerotinia eased in Saskatchewan and Manitoba compared to 2024’s historic highs, even as Alberta posted its worst-ever recorded blackleg incidence.
The potato sector illustrates how weather and disease pressure interact regionally rather than nationally. While Alberta and Manitoba expanded output and held the top two production shares in the country, Prince Edward Island and New Brunswick absorbed the brunt of an eastern drought that compounded existing late blight and soft rot pressures. This regional divergence — some provinces posting near-record yields while others post double-digit declines — is the defining pattern of crop disease in Canada 2026, and it underscores why province-by-province disease surveillance, rather than single national averages, is now essential reading for anyone tracking Canadian agriculture.
Wheat Disease Yield Losses in Canada 2026
Estimated Wheat Disease Losses – Western Canada, 2025 (thousand bushels)
Stripe rust |████████████████████████████ 19,776
Tan spot |███████████████████████ 16,252
Septoria tritici blotch |███████████████████████ 16,252
Stagonospora nodorum blotch |███████████████████████ 16,252
Ergot |█████████████████████ 14,446
Common root & foot rot |██████████ 7,224
Take-all |██████████ 7,223
Wheat streak mosaic complex |█████████ 6,095
Powdery mildew |██████ 4,018
| Disease | Total Loss (thousand bushels, Western Canada, 2025) |
|---|---|
| Stripe rust | 19,776 |
| Tan spot | 16,252 |
| Septoria tritici blotch | 16,252 |
| Stagonospora nodorum leaf and glume blotch | 16,252 |
| Ergot | 14,446 |
| Common root and foot rot | 7,224 |
| Take-all | 7,223 |
| Wheat streak mosaic complex | 6,095 |
| Powdery mildew | 4,018 |
Source: Crop Protection Network, Wheat Disease Loss Estimates from the United States and Canada — 2025.
Wheat disease losses in Canada 2026 were dominated by a single pathogen: stripe rust, which cost Western Canadian growers an estimated 19.8 million bushels in 2025 alone — more than any other disease tracked in the region. This is a notable shift, since early-season forecasts from the Prairie Crop Disease Monitoring Network had flagged lower stripe rust risk compared to 2024, based on reduced disease pressure reported from the U.S. Pacific Northwest and Texas–Nebraska corridor. Yet the disease still appeared relatively late in the season across Alberta, with confirmed detections near Brooks in mid-July 2025, and spread aggressively enough to become the top yield-limiting pathogen across the entire Alberta-Saskatchewan-Manitoba wheat belt.
The broader picture shows that Western Canada — representing 38.7% of total U.S. and Canadian wheat production — suffered a 7.4% production loss to disease in 2025, notably higher than the 5.2% average loss recorded across surveyed U.S. states. Tan spot, Septoria tritici blotch, and Stagonospora nodorum blotch each caused identical estimated losses of roughly 16.3 million bushels, reflecting how leaf-spot complex diseases tend to move together under similar humidity and rainfall conditions during the June-to-July window. Ergot, a head disease with direct grain-quality and marketability consequences, added a further 14.4 million bushels in losses, reinforcing why fungicide timing and crop rotation remain central themes in provincial extension advisories for 2026.
Fusarium Head Blight in Canadian Wheat 2026
FHB Incidence on CWRS Wheat, Western Canada – Selected Years (%)
Mid-to-late 1990s |███ <11%
2000s (decade avg) |█████████ 32%
2014 (CWRW peak) |██████████████████ 68.2%
2016 (epidemic year) |█████████████████ 66.5%
2021 (drought year) |▏ 0.8%
| Period | FHB Incidence (CWRS unless noted) |
|---|---|
| Mid-to-late 1990s | Below 11% |
| 2000s decade average | 32% (CWRS), 33.7% (CWAD), 46.2% (CWRW) |
| 2014 peak (CWRW) | 68.2% |
| 2016 epidemic year | 66.5% (CWRS), 79% (CWAD) |
| 2021 drought year | 0.8% (CWRS), 0% (CWRW), 6% (CWAD) |
Source: Canadian Grain Commission Harvest Sample Programme, Canadian Journal of Plant Pathology.
Fusarium head blight (FHB), long considered one of the most economically damaging wheat diseases in Canada, has followed a dramatic boom-and-bust pattern over nearly three decades of monitoring. Analysis of over 208,000 wheat samples collected between 1995 and 2021 through the Canadian Grain Commission’s Harvest Sample Programme shows incidence climbing from below 11% in the 1990s to a historic epidemic peak in 2016, when 66.5% of Canada Western Red Spring (CWRS) samples and 79% of Canada Western Amber Durum (CWAD) samples showed Fusarium-damaged kernels. That epidemic caused severe financial losses across the Prairies and reshaped how the industry approaches fungicide timing, variety selection, and grain segregation.
Since 2016, FHB incidence has generally declined, aided partly by drier growing seasons — the 2021 drought year recorded incidence as low as 0.8% on CWRS and 0% on CWRW. However, plant pathologists caution that FHB’s severity is not always correlated with incidence, meaning that even in lower-incidence years, the mycotoxin deoxynivalenol (DON) produced by the fungus can still pose food-safety and marketability concerns. With Fusarium graminearum now detected as far as northern British Columbia, expanding well beyond its original Manitoba range identified back in 1923, the disease’s geographic footprint continues to widen even as annual incidence rates fluctuate with weather.
Canola Blackleg Disease Statistics in Canada 2026
Blackleg Incidence by Province, 2025 Survey (% of plants affected)
Alberta |███████████████████████ 45%
Saskatchewan |█████ 11%
Manitoba |████ ~half of 2024 levels
| Province | 2025 Blackleg Incidence | Trend vs. 2024 |
|---|---|---|
| Alberta | 45% of plants surveyed | Highest on record |
| Saskatchewan | 11% across all fields (14% in infected fields) | Roughly half of 2024’s all-time high |
| Manitoba | Reduced, similar pattern to sclerotinia | Down significantly from 2024 |
Source: Saskatchewan Ministry of Agriculture, Canola Council of Canada, Canola Week 2025 disease survey presentations.
Canola blackleg statistics for Canada 2026 reveal one of the sharpest province-level divergences of the entire growing season. Alberta recorded a blackleg incidence of 45% of surveyed plants in 2025 — described by presenting plant pathologists as the highest level ever recorded in the province’s survey history — driven largely by warm, damp early-summer conditions that favoured the disease’s spread. By contrast, Saskatchewan saw incidence fall to roughly 11% across all surveyed fields, about half of the record levels observed in 2024, while regional prevalence still ranged from 95% of fields in the northwest and southeast down to 67% in the northeast.
Manitoba followed a similar downward trajectory to Saskatchewan, reinforcing a broader pattern in which blackleg — while less dependent on soil moisture than diseases like sclerotinia — still responds strongly to localized humidity and temperature swings during flowering. For growers, the practical takeaway from the 2025 survey data is that regional risk assessment now matters more than provincial or national averages: a field in northwest Saskatchewan faces a fundamentally different blackleg risk profile than one in the province’s southwest, even within the same growing season and under the same broad weather patterns.
Canola Clubroot Statistics in Canada 2026
| Province | Cumulative Clubroot Data (through 2024-2025) |
|---|---|
| Alberta | More than 4,300 fields with visible symptoms; 5,833 diagnosed crops since 2005 |
| Saskatchewan | 82 commercial fields with visible symptoms (2008-2024); 45 fields DNA-positive with no visible symptoms; zero new cases in 2025 |
| Manitoba | No symptoms found in 117 fields surveyed in 2025 |
| Other Prairie provinces combined (excl. Alberta) | 127 total fields with reported symptoms |
Source: Government of Saskatchewan, Government of Manitoba, Canola Council of Canada Encyclopedia, Strelkov et al. 2025.
Two decades after clubroot first triggered alarm among Prairie canola growers following its 2003 discovery near Edmonton, the disease has evolved from an existential threat into what one industry publication called a genuine “success story.” Despite clubroot’s continued presence in more than 4,300 Alberta fields, provincial canola yields still reached nearly 43 bushels per acre in 2025 — close to historical highs — demonstrating how resistant cultivars, extended crop rotations, and biosecurity practices have blunted the disease’s economic impact even as it remains widespread.
Saskatchewan and Manitoba continue to report the disease as a minor, tightly monitored concern rather than an active outbreak: Saskatchewan’s 2025 survey found zero new visible symptoms for the third consecutive year, and all 235 soil samples collected that year came back negative. Manitoba’s 2025 disease survey of 117 canola fields likewise found no symptoms, though officials note that less than 10% of Manitoba farms have ever been soil-tested for clubroot, meaning true prevalence could be underestimated. Soil samples from heavily infested Alberta zones have detected concentrations exceeding 10 million spores per gram, underscoring why continued DNA-based soil testing — rather than visual scouting alone — remains critical for early detection of new pathotypes across the Prairie provinces going into 2026.
If your organization tracks broader demographic trends alongside agricultural output, our Canada Population by Province Statistics breakdown offers useful context on how the Prairie provinces where clubroot pressure concentrates — Alberta, Saskatchewan, and Manitoba — compare in population and growth.
Canola Sclerotinia Stem Rot Statistics in Canada 2026
Sclerotinia Stem Rot Prevalence by Province, 2025 (% of fields)
Alberta |████████████████ 48%
Saskatchewan SE |████████████████ ~50%
Saskatchewan SW |███ ~10%
| Province/Region | 2025 Prevalence | 2025 Incidence |
|---|---|---|
| Alberta (provincial) | 48% of fields | 8% of plants |
| Alberta, 2024 comparison | 14% of fields | 0.9% of plants |
| Saskatchewan Southeast | ~50% of fields (highest region) | Regionally variable |
| Saskatchewan Southwest | ~10% of fields (lowest region) | Lowest incidence region |
| Saskatchewan Northeast/West Central | Moderate prevalence | 5% incidence (highest) |
Source: Saskatchewan Ministry of Agriculture, Canola Week 2025 presentation by Dr. Alireza Akhavan.
Alberta was the only Prairie province to see sclerotinia stem rot rise in 2025, with field prevalence jumping to 48%, more than triple the 14% recorded in 2024, and plant incidence climbing to 8% from just 0.9% the year before. This sharp increase reflects how sensitive sclerotinia is to localized moisture conditions during flowering, since the pathogen requires sustained humidity to produce the spore-releasing structures that infect canola stems. Saskatchewan and Manitoba, by contrast, both recorded reduced sclerotinia levels in 2025 compared to the prior season, consistent with drier conditions across much of the central and eastern Prairies.
Within Saskatchewan itself, the regional pattern was striking: the southeast region posted prevalence near 50% of fields, while the drier southwest region recorded roughly 10%, illustrating how closely sclerotinia tracks with rainfall and irrigation patterns rather than following a uniform provincial trend. Incidence — the percentage of individual plants affected — was highest in the northeast and west central regions at around 5%, areas that include a meaningful share of irrigated canola acres. For agronomists building risk models for 2026, this reinforces that sub-regional moisture mapping, not just provincial disease survey averages, is now essential for accurately forecasting sclerotinia risk and timing fungicide applications.
Verticillium Stripe in Canadian Canola 2026
| Metric | 2024 | 2025 |
|---|---|---|
| Manitoba field prevalence | 60% of fields | 73% of fields |
| Saskatchewan R.M.s confirmed | Fewer confirmed | 73 rural municipalities confirmed |
| Geographic spread | Primarily Manitoba | Prairie-wide, including Alberta |
Source: Manitoba Agriculture, Saskatchewan Ministry of Agriculture, Canola Week 2025 disease survey.
Verticillium stripe has emerged as the fastest-growing disease concern in Canadian canola production heading into 2026, with Manitoba field prevalence climbing from 60% in 2024 to 73% in 2025 — even as plant incidence within those fields stayed comparatively stable. What was once viewed largely as a Manitoba-specific problem has now been confirmed across 73 rural municipalities in Saskatchewan, with cases documented as far west as the RM of Maple Creek, and additional confirmed detections in Alberta. Plant pathologists at the 2025 Canola Week presentation explicitly described the disease as having shifted from a regional nuisance to a prairie-wide issue.
The reason verticillium stripe is drawing heightened concern is straightforward: unlike blackleg or sclerotinia, there are currently no significant fungicide options for managing the disease, and only a small number of tolerant canola cultivars exist on the market. This leaves growers with limited tools beyond extended crop rotation and monitoring, and it explains why provincial agriculture ministries have prioritized dedicated verticillium-specific surveys — separate from general canola disease surveys — in both Saskatchewan and Manitoba over the past two growing seasons. As breeding programs work to develop more resistant varieties, the disease’s rapid geographic expansion across three provinces in just two years makes it one of the top pathogens to watch through the remainder of 2026.
Potato Disease and Production Statistics in Canada 2026
Canadian Potato Production by Province Share, 2025
Alberta |█████████████ 27.1%
Manitoba |██████████ 21.4%
P.E.I. |███████ (down 15.9% YoY)
New Brunswick|████ (down 4.7% YoY)
| Metric | 2025 Figure |
|---|---|
| National potato production | 125.8 million hundredweight (down 0.9%) |
| P.E.I. production change | -15.9%, to 21.8 million cwt |
| New Brunswick production change | -4.7% |
| Alberta share of national output | 27.1% |
| Manitoba share of national output | 21.4% |
| National average yield change | -3%, to 321.2 cwt/acre |
| Late blight fungicide resistance | 95% of sampled strains resistant to metalaxyl |
Source: Statistics Canada Biannual Potato Area and Yield Survey, Potatoes in Canada, Agriculture and Agri-Food Canada.
Canadian potato production statistics for 2026 show the sector’s first output decline after four consecutive years of record harvests, with national production slipping 0.9% to 125.8 million hundredweight in 2025. The decline was driven almost entirely by drought conditions across Eastern Canada, where Prince Edward Island — historically one of the country’s top potato-producing provinces — saw output fall 15.9%, while New Brunswick dropped 4.7%. Meanwhile, Alberta and Manitoba, which together account for nearly half of national output (27.1% and 21.4% respectively), posted modest yield gains that partially offset the eastern losses, even as seeded area nationally rose to its highest level since 2007.
Late blight, caused by the oomycete pathogen Phytophthora infestans, remains the most economically destructive potato disease tracked by AAFC researchers, and recent genetic studies have found troubling trends in fungicide resistance. A multi-year AAFC study covering British Columbia and Eastern Canada found that 95% of sampled late blight strains showed resistance to metalaxyl, a commonly used systemic fungicide, forcing growers to rotate toward alternative products such as phosphorous-acid formulations. Ontario’s continuing Potato Soft Rot and Blackleg survey, alongside provincial spore-trap monitoring networks in regions like Kent County, reflects how disease forecasting has become increasingly data-driven — a trend likely to expand further as Canada’s potato belt contends with both shifting pathogen genetics and increasingly unpredictable regional weather patterns through 2026.
For readers researching how disruptions in Canadian food production ripple through communities, our detailed look at Food Bank Statistics in Canada tracks how supply pressures — including agricultural shortfalls tied to weather and disease — connect to rising demand for food assistance nationwide.
Economic and Weather Drivers of Crop Disease in Canada 2026
| Driver | 2025-2026 Data Point |
|---|---|
| Total US-Canada wheat production, 2025 | ~3.5 billion bushels, valued at $17.1 billion USD |
| Total US-Canada wheat disease losses | 205.0 million bushels, valued at $531.2 million USD |
| Canadian wheat production represented in disease survey | 98.7% (1.45 billion bushels) |
| Saskatchewan wheat yield growth, 2025 | +10.9%, to 49.7 bushels/acre |
| Alberta wheat yield growth, 2025 | +18.8% |
| National barley production growth, 2025 | +19.4% |
Source: Statistics Canada Field Crop Survey, Crop Protection Network, USDA-NASS.
Weather remains the single biggest variable shaping crop disease pressure in Canada 2026, and the interplay between record yields and disease losses in the same season is one of the more counterintuitive findings in this year’s data. Even as stripe rust, tan spot, and related foliar diseases combined to strip more than 50 million bushels from Western Canadian wheat production, the same region posted strong headline yield growth — Saskatchewan wheat production rose 10.9% and Alberta’s climbed 18.8% — showing that favourable early-season growing conditions and disease pressure are not mutually exclusive. Warmer, wetter stretches that boost overall crop development can simultaneously create the humid microclimates that rust spores and leaf-blotch pathogens need to spread.
This dual dynamic — rising production alongside rising disease losses — is precisely why economic loss estimates matter as much as yield statistics. The $531.2 million USD in combined US-Canada wheat disease losses for 2025 does not even include the cost of management, such as fungicide applications, seed treatments, and the breeding investment behind resistant varieties, meaning the true economic footprint of disease in Canadian wheat production is considerably higher than the raw bushel-loss figures suggest. Anyone tracking broader Canadian climate and seasonal patterns — since growing-season humidity, rainfall timing, and temperature swings are the direct triggers behind nearly every disease outbreak covered in this report — can find additional regional context in our Weather Guide covering seasons across Canada, which outlines the temperature and precipitation patterns that shape disease-conducive conditions province by province.
Disclaimer: The data research report we present here is based on information found from various sources. We are not liable for any financial loss, errors, or damages of any kind that may result from the use of the information herein. We acknowledge that though we try to report accurately, we cannot verify the absolute facts of everything that has been represented.
