Research Results

We did not find that high rates of phosphorus (P) fertilizer affected crop yield and had only a minimal impact on the overall canola microbiome community structure. In our study, the intermediate-rate P supplied in a narrow opener was the most cost-effective fertilization method which generated equivalent canola yield to the high P rate. Our rhizobox studies showed that early canola growth was higher in plants where half of the root system was exposed to fertilized soil and the other half to unfertilized soil. Each half of the root system had a distinct root microbiome indicating that the root-microbiome system may confer the best advantage in soil where P availability is heterogenous as would be found in most field soils.

An understanding of the effectiveness of liming to control different pathotypes will help in decision making, since liming to increase soil pH can be costly and will not produce satisfactory results if the pathogen strains present are less sensitive to pH.

This research project will provide canola producers with practical approaches to managing small patches of clubroot. This will be especially important in situations where the patch represents a new introduction to the area or farm, or where commercial sources of resistance are not available.

The objective of this project is to determine the best combination of fertilizer source, placement, and timing to maximize yield, improve fertilizer N use efficiency and reduce losses of N2O and ammonia (NH3) on light textured soil (sandy loam) in south-central Manitoba.

Flea beetles (both Crucifer and Striped), diamondback moths and aster leafhoppers are major pests of canola, all feeding on the plant at different times throughout the growing season. The outbreaks of each of these insects are difficult to predict year to year and currently there are no resistant varieties available, leaving insecticide application as the only control option.

This project has identified several soil-derived bacteria that are effective at inhibiting disease progression caused by Sclerotinia sclerotiorum, a fungal pathogen of canola and other plants that causes stem rot, yield decline, and plant death. The mechanisms of action of the most effective biocontrol agent were investigated, and the bacterium was grown in formulations according to commercial standards. These industry-ready formulations were demonstrated to be as effective as the laboratory cultures, resulting in a biocontrol product that will soon be available as an option for producers.

Pollen beetles were susceptible to three of four insecticides tested. Yield reductions was detected at 7-9 beetles per plant but not at four beetles per ten sweep. Pollen beetles were not detected in the Prairies provinces and no native parasitoids were found attacking pollen beetle larvae in Atlantic Canada.

The objective of this project was to utilize archived small-plot canola agronomic trial data and corresponding regional weather data to conduct a meta-analysis to examine the relationship between environmental conditions and canola emergence.

Several clubroot-resistant canola cultivars have been developed in Canada, however the newly evolved Plasmodiophora brassicae pathotypes have overcome some of the resistances. The long-term objective of this project is to diversify the clubroot resistant genes in Canadian canola for clubroot resistance and develop molecular markers for these resistances.

Aster leafhoppers are the main vector of Aster Yellows Phytoplasma (AYp) in the Canadian Prairies. AYp causes Aster Yellows (AY) disease in many plant species but can greatly affect canola in outbreak years.