Journal of Plant Diseases and Protection (2006) 113, 267-274

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H. Su, S.F. Hwang, K.F. Chang, R.L. Conner, A.G. Xue, T.D. Warkentin, S.F. Blade and G.D. Turnbull (2006)
Assessment of yield loss caused by mycosphaerella blight in field pea crops in western Canada
Journal of Plant Diseases and Protection 113 (6), 267-274
Abstract: The relationship between yield and disease severity of Mycosphaerella pinodes on field pea was analyzed and linear yield loss models were derived using the relationship between yield ratio and disease severity ratio, which integrated data from different seasons. Yield ratio and disease ratio were introduced to assess actual yield loss.
The relationships between yield, 1000-seed weight and disease severity (final severity ratings, area under disease progress curve (AUDPC)) were established in field trials in Edmonton, Alberta, Canada in 2002 and 2003; the relationship between yield and AUDPC in Morden, Manitoba, Canada in 1994 and 1995 was derived from the published data. Yield reduction was linearly related to the final disease severity or AUDPC in 2002 and 2003, while 1000-seed weight was not correlated to final disease severity or AUDPC except in 2003, when it was significantly related to final severity. No significant relationship occurred between yield or 1000-seed weight and AUDPC in 1994 and 1995.
The relationship between yield ratio and AUDPC ratio was derived from the equation of yield and AUDPC relationships from the Morden and Edmonton trials. Significant relationships occurred between the yield ratio or 1000-seed weight ratio and the AUDPC ratio for both sites. The relationships between 1000-seed ratio and AUDPC ratio were not significantly different between the Edmonton and Morden trials, and were also not significantly different from that between yield ratio and AUDPC ratio in Edmonton trials. These integrated relationships derived from different seasons can provide a method for prediction of actual yield loss in situations where relationships between yield and disease severity change from season to season due to environmental conditions.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Allen G. Xue, Robert L. Conner

Research topic(s) for pests/diseases/weeds:
damage/losses/economics

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Didymella pinodes Pea (Pisum sativum) Canada (west)
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