Justine Cornelson from BrettYoung Seeds speaks about verticillium at Manitoba AgDays in Brandon in January, 2025.

Researchers scramble to understand verticillium in Canada

Disease is a relative newcomer to Canada and has been the subject of little research globally

Justine Cornelson of BrettYoung Seeds says verticillium is one reason Manitoba saw disappointing canola yields last year. The disease needs to be the subject of more research, since little has been done to date.

Verticillium stripe infects canola plants and produces tiny, pepper-like sclerotia on or inside the stem, which interfere with the uptake of water and nutrients.  |  File photo

Study finds alkaline soil promotes soil fungus

Alberta researchers determine that verticillium stripe is more severe in canola growing regions where pH is 7.4 to 8.6


WINNIPEG — Verticillium stripe is a more common and troublesome disease for canola growers on the eastern half of the Prairies, particularly in Manitoba. Meanwhile, verticillium isn’t a huge issue in Alberta. There may be a simple reason for this geographic variation — soil pH. Researchers at the University of Alberta have learned that Verticillium […] Read more

Verticillium stripe is a fungal disease that infects roots and enters the plant’s vascular system. It’s now present in all three Prairie provinces.  |  Justine Cornelsen photo

Verticillium stripe in spotlight as threat grows

A U of A study just wrapped up, and four Canola Agronomic Research Program projects are now investigating the disease

Glacier FarmMedia – If you’re a canola grower on the Prairies, you know there are no chemical solutions or varieties to kill or resist soil-borne verticillium stripe disease. You may also know the handful of management practices that can thwart the disease to some extent. And if a crop has been damaged by it, you […] Read more


Verticillium in potatoes can significantly reduce yield and, being soil-borne, is difficult to manage. Preliminary research results suggest earlier planting of risk-prone fields could reduce losses, in part due to colder soil temperatures earlier in the season. | File photo

Seed potatoes early to avoid verticillium

Pushing a problem field to the front of the planting queue may reduce infection pressure later in the season

Verticillium wilt is a problem for a lot of crops in Manitoba, including canola, sunflowers and alfalfa. In potatoes, the fungus Verticillium dahlia is the main cause of potato early die complex. In a 2021 interview with the Co-operator, Mario Tenuta, University of Manitoba soil scientist and main investigator with the Canadian Potato Early Dying […] Read more

University of Alberta scientists will soon publish a Canadian estimate to nail down what verticillium means for yield. | Canola Council of Canada photo

Verticillium’s impact studied

WINNIPEG — For a few years, canola industry leaders have been worried about verticillium stripe and its impact on crop yields. Reports out of Europe suggest the fungal disease could cause a wide range of losses, anywhere from 10 to 50 percent on oilseed rape. However, the extreme losses are usually confined to a tiny […] Read more


On the Prairies, verticillium is most common in Manitoba, where it appeared in 40 percent of canola fields in 2022. | File photo

Researchers study verticillium yield losses

WINNIPEG — For a few years, canola industry leaders have been worried about verticillium stripe and its impact on crop yields. Reports out of Europe suggest the fungal disease could cause a wide range of losses, anywhere from 10 to 50 percent on oilseed rape. However, the extreme losses are usually confined to a tiny […] Read more

In 2022, Saskatchewan Agriculture staff discovered that verticillium stripe, a disease of canola, was commonplace in the eastern part of the province. This fall, producers in other regions have found the disease in their canola. | File photo

Farmers watch as verticillium extends its reach in Sask.

The canola disease appears to be moving west and north after being found in eastern part of the province last year

Anecdotal evidence suggests that verticillium is moving north and west across Saskatchewan. In 2022, Saskatchewan Agriculture staff discovered that verticillium stripe, a disease of canola, was commonplace in the eastern part of the province. This fall, producers in other regions have found the disease in their canola. “I’ve got verticillium in Davidson like you wouldn’t […] Read more

Plant pathologists in Alberta have searched for verticillium in post-harvest disease surveys since 2020. So far, they haven’t found it. | File photo

Verticillium has still not been confirmed in Alta.

As pathologists continue to check for verticillium stripe, researchers find a link between it and blackleg

Verticillium stripe, a disease of canola, is nearly everywhere in Manitoba and is now common in eastern Saskatchewan. But it’s not in Alberta. Plant pathologists in Alberta have searched for verticillium in post-harvest disease surveys since 2020. So far, they haven’t found it. “In 2020, we found suspicious symptoms in about four fields, but the […] Read more


A hand holds healthy canola stalks along with those withered by verticillium infection.

Canola varieties show genetic resistance to verticillium

University of Manitoba researcher leads study to better understand genetic resistance to the soil-borne disease

CARMAN, Man. — Research in Manitoba has found some canola varieties, or canola lines in the development pipeline, have resistance to verticillium. That’s a relief for canola growers because verticillium stripe has become a common disease in canola fields, at least in the eastern Prairies. “I don’t know if they’re commercial (varieties) or not. The […] Read more