Surveillance of Canola Diseases in Manitoba

Canola is one of the most economically important crops produced in Manitoba.  To continue to grow profitable canola crops, yield reducers such as disease need to be identified.

Annual surveys of commercial canola crops provide valuable information on the distribution of canola diseases and on the impact of farming practices on specific disease incidence and severity.

Results from disease surveys can help farmers, agronomists and researchers prioritize where future resources need to be directed and can provide early warning on the occurrence of new diseases or varietal resistance/pesticide failure.

Annual canola surveys for disease have been occurring in Manitoba since 1971 with collaboration from Agriculture and Agri-Food Canada (AAFC), Manitoba Agriculture Food and Rural Development (MAFRD) and the University of Manitoba. 

In more recent surveys (2009 to present), AAFC Brandon and MAFRD have targeted 150 fields annually across the canola growing regions of Manitoba.  Surveys occur after flowering, but before swathing the canola.  Crops are assessed for the prevalence (% crop infested) and incidence (%plant infected) of Sclerotinia, Blackleg, Aster Yellows, Alternaria, Foot Rot, Fusarium Wilt and Clubroot.

In each field, 100 plants are selected from a “W” pattern in the field, where the five points of the “W” are at least 20 paces apart.  All plants are pulled from the soil and individually examined for presence of disease.  Soil samples are also gathered from the field entrance in a “W” pattern to test for the presence of clubroot spores in the soil.

In reviewing the results below, please note that “Prevalence” is the % of fields having infection within the province and “Incidence” is the average number of plants showing infection within an infected field.  All these results and more information on the individual survey year and trends can be found in the Canadian Plant Disease Survey publication from the Canadian Phytopathological Society.  The reference for the individual survey and the link to the publication is referenced below each year’s table.

 

Results of 2013 Canola Disease Survey:

FIELDS SURVEYED (146)
Sclerotinia
Blackleg
Aster
Yellows
Fusarium
Wilt
Clubroot
Alternaria
Pod Spot
Stem
Basal
Plant
Soil
% Prevalence
66
63
75
7
4
1
2
30
Mean Incidence
7
9
13
<1
<1
<1
-
<1

Reference: McLaren, D.L., Platford, R.G., Kubinec, A., Derksen, H., Bargen, E., Brackenreed, Brown-Livingston, K., Buss, T., Chomokovski, D., Farooq, A, Hausermann, D., Heshka, J., Henderson, T., Jersak, S., Kaskiw, E.,  Kaskiw, L., Kristjanson, I., Lange, D., McCracken, M., Nernberg, E., Picard, R. and Stoyanowski, D. 2014. Survey of canola diseases in Manitoba in 2013. Can. Plant Dis. Surv. 94: 180-183. (http://www.phytopath.ca/download/cpds-archive/vol94/cpds_vol_94_2014.pdf).

 

Results of 2012 Canola Disease Survey:

FIELDS SURVEYED (142)
Sclerotinia
Blackleg
Aster
Yellows
Fusarium
Wilt
Clubroot
Alternaria
Pod Spot
Stem
Basal
Plant
Soil
% Prevalence
65
68
77
95
4
0
6
20
Mean Incidence
9
9
12
10
<1
0
-
2

Reference: McLaren, D.L., Platford, R.G., Kubinec, A., Derksen, H., Kutcher, H.R., Bargen, E., Bisht, V., Brackenreed, A., Buss, T., Chomokovski, D., Farooq, A, Hausermann, D., Henderson, T., Jersak, S., Johnson, H., Kaskiw, L., Kristjanson, I., Lange, D., McCracken, M., Nernberg, E., Picard, R., Stadnyk, S. and Stoyanowski, D. 2013. Survey of canola diseases in Manitoba in 2012. Can. Plant Dis. Surv. 93: 155-158. (http://www.phytopath.ca/download/cpds-archive/vol93/cpds_vol_93_2013.pdf).

 

Results of 2011 Canola Disease Survey:

FIELDS SURVEYED (121)
Sclerotinia
Blackleg
Aster
Yellows
Fusarium
Wilt
Clubroot
Alternaria
Pod Spot
Stem
Basal
Plant
Soil
% Prevalence
45
63
67
18
9
0
2
64
Mean Incidence
5
7
9
<1
1
0
-
2

Reference: McLaren, D.L., Platford, R.G., Kubinec, A., Kutcher, H.R., Bisht, V., Derksen, H., Kristjanson, I., Phillips, K., Henderson, T.L., Hausermann, D.J., Jack, B., Picard, R., Jersak, S., Johnson, H., Stornowski, D., Neurenberg, E., Farooq, A. and McCracken, M. 2012. Survey of canola diseases in Manitoba in 2011. Can. Plant Dis. Surv. 92: 130-132.
(
http://www.phytopath.ca/download/cpds-archive/vol92/cpds_vol_92_2012.pdf)

 
 
Results of 2010 Canola Disease Survey:
 
FIELDS SURVEYED (163)
Sclerotinia
Blackleg
Aster
Yellows
Fusarium
Wilt
Clubroot
Alternaria
Pod Spot
Stem
Basal
Plant
Soil
% Prevalence
88
66
58
14
3
0
0
64
Mean Incidence
31
11
13
2
2
0
-
2
Reference: McLaren, D.L., Platford, R.G., Kutcher, H.R., Bisht, V., Kubinec, A., Kristjanson, I., Hammond, D., Henderson, T.L., Hausermann, D., Kaskiw, L., Williamson, K., Jersak, S., Johnson, H., Souque, J., Heshka, J. and Farooq, A. 2011. Survey of canola diseases in Manitoba in 2010. Can. Plant Dis. Surv. 91: 124-126. (http://www.phytopath.ca/download/cpds-archive/vol91/cpds_vol_91_2011.pdf).
 
 
Results of 2009 Canola Disease Survey:
 
FIELDS SURVEYED (146)
Sclerotinia
Blackleg
Aster
Yellows
Fusarium
Wilt
Clubroot
Alternaria
Pod Spot
Stem
Basal
Plant
Soil
% Prevalence
91
56
55
15
4
0
0
40
Mean Incidence
18
4
4
<1
<1
0
0
6
Reference: McLaren, D.L., Kubinec, A.M., Henderson, T.L., Hausermann, D.J. and Kerley, T.J. 2010. Diseases of canola in Manitoba in 2009. Can. Plant Dis. Surv. 90: 130-132. (http://www.phytopath.ca/download/cpds-archive/vol90/cpds_vol_90_no_1_%281-166%292010.pdf).
 

For more information on diseases in canola, visit the following pages: