Interplanting Susceptible and Resistant Radish Cultivars Reduces Colonization by Plasmodiophora brassicae

Abstract

Clubroot-susceptible ‘Scarlet Knight’ radish plants grown with resistant ‘Saxafire’ radish plants, in a Plasmodiophora brassicae Wor.-infested growth medium, had significantly lower incidence of colonization and club formation than susceptible plants grown alone. This decrease in disease development was due to a reduction in the rate and, consequently, the amount of colonization of the root cortex, medullary rays, and stele. A similar response occurred whether a susceptible plant was grown in the presence of 2, 4, or 7 resistant plants.

Seedling age and inoculum density affect clubroot severity and seed yield in canola

“…Reduction in clubroot severity is also possible with the application of fungicides (Mitani et al 2003) and soil amendments (Hwang et al 2008), but the rates used for horticultural crops are not cost-effective for canola. As a result, a range of alternative management strategies are being assessed for their usefulness in canola production, including timing of seeding (Gossen et al 2009), biological control (Peng et al 2009), and the use of bait crops ( Kroll et al 1984;Ikegami 1985;Mukarami et al 2001).…”