The application of hydrated lime to bring an acidic soil up to pH 7.2, and/or weed control of cruciferous weeds did not affect clubroot severity on a clubroot resistant variety. The yield of a susceptible canola variety almost doubled with the application of hydrated lime,...

Yield losses to clubroot disease, caused by Plasmodiophora brassicae, increased linearly as the Disease Severity Index (DSI) increased. Under greenhouse conditions, an increment of 1% in DSI resulted in a decrease of 0.9% to 1.0% in yield; under field conditions, this percentage was reduced to...

Research trials found that hydrated lime may be an effective tool for managing clubroot disease in canola when optimal timing and rainfall are achieved. Field and greenhouse trials found hydrated lime more effective than limestone applications, but is much more costly. Clubroot disease, caused by Plasmodiophora...

Researchers investigated the efficacy and durability of canola lines carrying single and multiple clubroot resistance (CR) genes against 'new' and 'old' pathogen pathotypes. Stacked CR genes of different modes of action improved resistance and enhanced durability. Cultivar resistance is a cornerstone of clubroot management. Most canola...

Research conducted over the past decade set the foundation for today’s clubroot management practices. This research covered the potential of biofungicides/fungicides, cultivar resistance, and crop rotation for management of clubroot disease caused by Plasmodiophora brassicae. Synthetic fungicides ineffective The fungicides Allegro and Omega (fluazinam) and Ranman (cyazofamid)...

A ≥2 year break from clubroot-resistant canola resulted in a 95% decrease in clubroot resting spore concentrations. In the third year after the harvest of clubroot-resistant canola, resting spore concentrations were similar to those of host-free control plots. Previous small plot research showed the value of...

Canola yield with a three-year break between canola crops was significantly higher than a tighter canola-barley rotation by 18 bushels per acre. Growing clubroot resistant canola in a tight rotation was not a strategy that could be implemented to keep clubroot spore populations low, and...

The maintenance of a naturally occurring clubroot nursery provided an evaluation site for over 60 canola lines, varieties and cultivars over 4 years in southern Alberta. The nursery site was also used extensively for training and extension activities. When you get served lemons, make lemonade. In...

A set of clubroot surveillance practices was developed for effective monitoring of the occurrence and severity of Plasmodiophora brassicae in commercial fields. Clubroot, we’re watching you. A major focus of research into clubroot disease caused by P. brassicae is surveillance of the geographic spread of...

Bleach (sodium hypochlorite) was most effective in killing clubroot (Plasmodiophora brassicae) spores at concentrations above 1.7%. Spray Nine was almost as effective, while 5 other products achieved greater than 95% control. Sanitation of equipment, vehicles, scouting tools and footwear is an important part of preventing the...