Suppression of clubroot by dazomet fumigant

Clubroot, caused by Plasmodiophora brassicae, is an important disease in canola (Brassica napus) and other crucifers. Experiments were conducted to examine the effectiveness of the prill formulation of the soil fumigant dazomet (tetrahydro-3,5-dimethyl-2H-1,3,5-thiadiazine-2-thione, trade name Basam...

Full description

Saved in:
Bibliographic Details
Published in:Canadian journal of plant science 2018-02, Vol.98 (1), p.172-182, Article CJPS-2017-0099
Main Authors: Hwang, S.F, Ahmed, H.U, Strelkov, S.E, Zhou, Q, Gossen, B.D, McDonald, M.R, Peng, G, Turnbull, G.D
Format: Article
Language:English
Subjects:
Brassica napus
Canola
Clubroot
Controlled conditions
disease management
eradication
Fumigation
Fusarium avenaceum
Infections
lutte contre la maladie
Plant sciences
Plasmodiophora brassicae
Pythium ultimum
Rape plants
Rhizoctonia solani
Seeding
Seedling blight
Seedlings
éradication
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Clubroot, caused by Plasmodiophora brassicae, is an important disease in canola (Brassica napus) and other crucifers. Experiments were conducted to examine the effectiveness of the prill formulation of the soil fumigant dazomet (tetrahydro-3,5-dimethyl-2H-1,3,5-thiadiazine-2-thione, trade name Basamid) on infection by P. brassicae, clubroot severity, and the growth and yield of canola. In greenhouse studies, seedling emergence and plant height increased while infection (both primary and secondary) and clubroot severity decreased, with increasing rates of a dazomet pretreatment. Under field conditions, seedling emergence, gall mass, and seed yield were reduced, especially at high rates of dazomet application (e.g., 0.4–0.8 t a.i. ha-1). A study conducted under controlled conditions indicated that an inadequate interval between the dazomet treatment and seeding was the underlying cause of the phytotoxic effect on canola in the field experiments. Further field studies showed that covering the soil with construction-grade plastic after dazomet application increased its efficacy, reducing gall weight and clubroot severity and increasing seed yield. Fumigation with dazomet also increased emergence, plant survival, and plant biomass in P. brassicae-infested soils that were inoculated with the soil-borne fungal pathogens Fusarium avenaceum, Pythium ultimum, and Rhizoctonia solani. These results suggest that dazomet is effective against both clubroot and seedling blight in canola.
ISSN:0008-4220
1918-1833
DOI:10.1139/cjps-2017-0099