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Management of clubroot of Asian Brassica crops grown on organic soils

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Title: Management of clubroot of Asian Brassica crops grown on organic soils
Author: McDonald, M. R.; Kornatowska, B.; McKeown, A. W.
Department: Department of Plant Agriculture
Abstract: Clubroot of crucifers (Plasmodiophora brassicae Woronin) is endemic in most organic soils in Ontario, Canada. Production of cole crops on these soils is limited, but production of Asian Brassica crops has increased markedly and clubroot has become an important limiting factor. Applications of lime are recommended for disease management, but results have been variable. Field trials were conducted from 1999 to 2001 to evaluate the efficacy of calcium cyanamide (Perlka, 50% calcium oxide, 19.8 % nitrogen, 1.5 % magnesium oxide) for the management of clubroot on muck soil (60% organic matter, pH 6.4). Shanghai pak choy (Brassica rapa subsp. chinensis var. communis and flowering Chinese cabbage (B. rapa subsp. chinensis var. utilis) were direct seeded in June and August of each year, along with Chinese broccoli ( B. oleracea var. alboglabra) in 1999 and 2000. Perlka at 1000, 500 and 333 (banded) kg/ha, and calcitic lime (4.9 tonnes/ha, 1999 or 8 tonnes/ha, 2000, 2001) were incorporated 14 days before seeding, or in the fall of 2000, prior to seeding in 2001. The untreated check received 200 kg/ha N. In 2000 and 2001, a treatment of 1000 kg/ha Perlka, applied 7 days before seeding, and an additional check with 100 kg/ha N, were included. In the trails seeded in June, all rates of Perlka reduced clubroot incidence (average 16%) compared to the untreated check (43%) and lime treatments (33%). Shanghai pak choy had a consistently higher incidence of clubroot than flowering Chinese cabbage. Clubroot incidence was much lower in the trials seeded in August (5.8 % disease in 2000) and no significant differences were detected. Under high disease pressure, clubroot incidence was effectively reduced by Perlka soil amendments. Application of lime was less effective. Crop selection and timing of seeding can also be used to manage clubroot.
Date: 2004
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Related Publications: McDonald, M.R., Kornatowska, B. and McKeown, A.W. (2004). Management of clubroot of Asian Brassica crops grown on organic soils. Acta Hortic. 635, 25-30. DOI: 10.17660/ActaHortic.2004.635.3

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