Effect of earthworms and incorporation of grass on Plasmodiophora brassicae

作者: Hanna Friberg , Jan Lagerlöf , Katarina Hedlund , Birgitta Rämert

DOI: 10.1016/J.PEDOBI.2008.02.001

关键词:

摘要: The resting spores of Plasmodiophora brassicae, causal agent clubroot disease crucifers, are tolerant structures with the abitity to survive for at least 15 years in soil waiting a host. influence incorporation cut grass (Lolium perenne) and presence earthworm Aporrectodea caliginosa on R brassicae was investigated microcosm experiment, measured as development susceptible bait plants (Brassica rapa var. pekinensis). Grass material incorporated every other month during 498 days samples P bioassay were collected nine times, just before each grass. treatment, irrespective presence, resutted tower pH, increased proportion large soil. aggregates abundance mites, collembolans nematodes. microbial biomass (SIR) by incorporation, result an increase growing biomass. When earthworms present, response community more pronounced, organic material. mineralised efficiently, leading higher percentage ash content In contrary these changes, severity did not differ among treatments any specific sampling. Across all samplings, however, treatment without compared control treatment. contradicts earlier studies effects brassicae. importance different species interaction is discussed. (c) 2008 Elsevier GmbH. All rights reserved. (Less)

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