Blackleg — Underestimated, Misdiagnosed and a Serious Threat to Canola

When it comes to diseases that rob canola yields, blackleg often doesn’t get the credit it deserves.

Many farmers underestimate the significance of blackleg, says Bruce McKinnon, an agronomist with Dekalb in Alberta, in the video below.

“Blackleg is a powerful disease that seems to be able to adapt to whatever we throw at it. As we’ve tightened canola rotations we’ve allowed that to develop. Blackleg has started to come back,” he says. “We’ve been a little complacent because we thought we had the resistance built in and that we had the strains covered. That’s not the case, as it’s starting to break down.”

While breeders continue to work on new sources of resistance, McKinnon says a crop rotation with cereals or corn is the best management tool for blackleg in canola.

Assessing stems for blackleg.
Assessing stems for blackleg.

“There’s not an endless pool of resistance out there,” he says. “Guys are going to have to help out with management through rotations.”

Part of the problem is that blackleg is sometimes misdiagnosed, notes McKinnon.

“I think sometimes we mistake it for sclerotinia until we actually get out there. The proper way to diagnose it is at swathing time, take your garden snips with you. Cut the plant at the base, if it’s white then you’re good to go. If you see some black lesions, then you have some infection,” he explains. “A lot of times growers are very busy and don’t take the time to do that.”

Related: Canola School: I’ve Found Blackleg in my Canola Stubble — Now What?

McKinnon spoke with Shaun Haney at one of the stops on the Monsanto Momentum Tour at Carseland, Alberta:

Leave a Reply

 

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Privacy Preference Center

Necessary

Necessary cookies help make a website usable by enabling basic functions like page navigation and access to secure areas of the website. The website cannot function properly without these cookies.

gdpr, __cfduid, PHPSESSID, wordpress_test_cookie, woocommerce_items_in_cart, woocommerce_cart_hash, wp_woocommerce_session, wordpress_logged_in, wordpress_sec, wp-settings, wp-settings-time, __cf_mob_redir, wordpress_cache, realag
__cfduid

Marketing

Measuring interactions with the ads on the domain.

__gads,fsk_ut_2317
IDE

Statistics

These are used to track user interaction and detect potential problems. These help us improve our services by providing analytical data on how users use this site.

_ga,_gid,_gat,_cb,_chartbeat2,_chartbeat4
_ga,_gid
metrics_token

Preferences

Preference cookies enable the website to remember information that changes the way the website behaves or looks, like your preferred language or the region that you are in.

chartdefaults, comment_author, comment_author_email, comment_author_url
JSESSIONID, _os_session,anonymous_votes,csrf-param,csrf-token,user,user-id,user-platform,intercom-session,intercom-lou,intercom-session
personalization_id, tfw_exp

 

Register for a RealAgriculture account to manage your Shortcut menu instead of the default.

Register