Effect of soil type, organic matter content, bulk density and saturation on clubroot severity and biofungicide efficacy

摘要: Growth room experiments were conducted to assess the interaction of soil type, biofungicides, compaction and pathotype/host on infection symptom development caused by Plasmodiophora brassicae, cause clubroot Brassica spp. In two initial experiments, four types (peat soil, mineral non-calcareous sand, soil-less mix), biofungicides (Bacillus subtilis, Clonostachys rosea), pathotypes (3 6, Williams’ differential set) assessed. Differences in severity associated with type unexpectedly small variable. Prestop (C. rosea) was often more effective than Serenade (B. subtilis) at reducing levels peat soils, but less sand. Inoculation pathotype 3 resulted a slightly higher mean 6. The type × biofungicide similar both canola (B. napus) Shanghai pak choy (B. rapa subsp. chinensis), whether kept saturated or allowed drain after inoculation. impact biofungicide efficacy might explain, part, why are one location another. observation that mix affected led an investigation bulk density. Severity compacted lower soils when density reduced adding mix. this study, had larger organic matter pathotype.