Canadian Journal of Plant Pathology (2011) 33, 475-484

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A. Deora, B.D. Gossen, F. Walley and M.R. McDonald (2011)
Boron reduces development of clubroot in canola
Canadian Journal of Plant Pathology 33 (4), 475-484
Abstract: Boron (B) slows the development of Plasmodiophora brassicae (clubroot) during infection of root hairs (primary infection) and the root cortex (secondary infection) of several vegetable Brassica spp., but the impact of B application on clubroot development in canola has not been assessed. The present study assessed the impact of B application rates (0, 0.25, 0.5, 1, 2, 4, 8, 16, 32 kg ha−1), application timing, and commercial formulations of B (Solubor, BoronMax, Boron) on primary and secondary development of clubroot in canola. Under controlled conditions, increasing rates of B application reduced root hair infection and subsequent development of primary and secondary infection. However, phytotoxicity to canola seedlings occurred at rates higher than 2 kg B ha−1. Application of 2 kg B ha−1 reduced overall root hair infection only slightly, from 81% to 65%, but delayed the development of each stage of primary infection. There were no substantial differences in reduction of incidence and severity of the disease by B whether it was applied before root-hair infection (pre-emergence) or before cortical infection (post-emergence), or split into two applications (pre-emergence + post-emergence). All three formulations of B exhibited similar responses. In field trials, 4 kg ha−1 was the most effective rate that produced no phytotoxic symptoms. Clubroot severity at 6 weeks after seeding was reduced by 64% compared with a nontreated control. This indicates that B application could be an important component of an integrated management programme to manage P. brassicae in canola.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Bruce D. Gossen, Mary Ruth McDonald

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation

Pest and/or beneficial records:

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

Plasmodiophora brassicae Rape/canola (Brassica napus)