Translator Disclaimer
15 August 2019 Influence of resistant cultivars and crop intervals on clubroot of canola
S.F. Hwang, H.U. Ahmed, Q. Zhou, H. Fu, G.D. Turnbull, R. Fredua-Agyeman, S.E. Strelkov, B.D. Gossen, G. Peng
Author Affiliations +
Abstract

Clubroot, caused by Plasmodiophora brassicae, is an important constraint on canola (Brassica napus) production in Canada. Rotations of clubroot-resistant (CR) canola cultivars in various sequences and planting intervals between canola with non-host crops and fallow periods were evaluated to determine their effects on clubroot severity and P. brassicae resting spore populations under field and micro-plot conditions. Under micro-plot conditions, the rotation sequences including CR canola, continuous fallow, and the non-host barley reduced gall weight by 63%–100% and clubroot severity by 34%–100% compared with continuous planting of susceptible canola. No visible clubroot symptoms developed following continuous fallow or the non-host crop. Under field conditions, clubroot severity was very high (78% disease index) in the continuous susceptible canola sequence. Most of the CR canola rotation sequences significantly reduced clubroot severity by 12%–23%, but continuous fallow, continuous barley, and alternating the CR canola cultivars ‘45H29’ or ‘73-47’ with ‘TC72429-10’ reduced clubroot severity by 32%–36%. A comparison of intervals between canola crops and four cropping sequences (continuous susceptible canola, alternating canola with barley or pea, a 2-yr non-host interval between canola crops, and a 3-yr non-host interval between canola crops) was conducted over 5 yr. A 2- or 3-yr non-host interval improved plant height, plant biomass, and seed yield, and reduced gall mass, P. brassicae propagules in the soil, and clubroot severity. A significant yield increase of more than 3600% was observed in a 3-yr non-host interval.

© Her Majesty the Queen in Right of Canada 2019. Permission for reuse (free in most cases) can be obtained from Rightslink.
S.F. Hwang, H.U. Ahmed, Q. Zhou, H. Fu, G.D. Turnbull, R. Fredua-Agyeman, S.E. Strelkov, B.D. Gossen, and G. Peng "Influence of resistant cultivars and crop intervals on clubroot of canola," Canadian Journal of Plant Science 99(6), 862-872, (15 August 2019). https://doi.org/10.1139/cjps-2019-0018
Received: 22 January 2019; Accepted: 22 May 2019; Published: 15 August 2019
JOURNAL ARTICLE
11 PAGES

This article is only available to subscribers.
It is not available for individual sale.
+ SAVE TO MY LIBRARY

Share
SHARE
KEYWORDS
Brassica napus
canola
clubroot
crop rotation
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top