Potential biological control of clubroot on canola and crucifer vegetable crops

摘要: Clubroot caused by Plasmodiophora brassicae is an emerging threat to canola (Brassica napus) production in western Canada, and a serious disease on crucifer vegetable crops eastern Canada. In this study, seven biological control agents two fungicides were evaluated as soil drenches or seed treatments for of clubroot. Under growth cabinet conditions, soil-drench application formulated biocontrol Bacillus subtilis Gliocladium catenulatum reduced clubroot severity more than 80% relative pathogen-inoculated controls highly susceptible cultivar. This efficacy was similar that the fluazinam cyazofamid. high pressure greenhouse less effective fungicides. Additionally, all delivered coating drench. field trials conducted 2009, different consisting commercial formulation B. subtilis, G. catenulatum, cyazofamid applied in-furrow drench at 500 L ha−1 water volume one resistant cultivar sites seeded Alberta site Chinese cabbage Ontario. There no substantial impact cultivar, but cabbage, lowering 54–84%. period 4 weeks without rain after seeded, which likely contributed low treatment canola. B. subtilis products became substantially 2 weeks dry soil, retained its least 4 weeks.