Effect of swathing on alternaria black spot in Brassica rapa canola in Saskatchewan

From 1990 to 1997, experiments were conducted comparing the effect of swathing versus straight combining on seed infection by Alternaria species and on quality of harvested seed. This was done at several locations in Saskatchewan using a number of cultivars of Brassica rapa and B. napus. The level o...

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Bibliographic Details
Published in:Canadian journal of plant science 1999-04, Vol.79 (2), p.299-302
Main Authors: Duczek, L.J, Seidle, E, Reed, S.L, Sutherland, K.A, Rude, S.V, Rimmer, S.R
Format: Article
Language:English
Subjects:
Alternaria
Brassica napus
Brassica rapa
Brassica rapa subsp. campestris
crop production
crop yield
cultivars
disease control
genetic variation
plant diseases and disorders
plant pathogenic fungi
windrowing
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Summary:From 1990 to 1997, experiments were conducted comparing the effect of swathing versus straight combining on seed infection by Alternaria species and on quality of harvested seed. This was done at several locations in Saskatchewan using a number of cultivars of Brassica rapa and B. napus. The level of A. brassicae in harvested seed was significantly higher in straight-combined than in swathed treatments. Green seed count and seed weight were not affected by treatment. Seed germination was reduced, but not always significantly, with straight combining compared to swathing. This data support the recommendation for swathing at the optimal time to reduce alternaria black spot when the potential for disease development is high. Swathing reduces the time for disease development because it reduces the time of ripening compared with straight combining. Key words: Alternaria black spot, Alternaria brassicae, canola, swathing
ISSN:0008-4220
1918-1833
DOI:10.4141/P98-063