Articles
REPLANT DISEASE CONTROL AND SYSTEM RESILIENCE TO PATHOGEN RE-INFESTATION IN RESPONSE TO BRASSICA SEED MEAL AMENDMENT
Article number
1044_11
Pages
105 – 112
Language
English
Abstract
Brassicaceae seed meal (SM) formulations were compared with pre-plant soil fumigation for the ability to control apple replant disease and to suppress pathogen/parasite re-infestation of orchard soils.
Soil fumigation and SM treatment provided similar levels of disease control during the initial growing season.
In controlled studies, SM amendment resulted in development of a soil system suppressive towards disease incited by Pythium abappressorium and Rhizoctonia solani AG-5. The apparent functional mechanisms responsible for disease suppression differed with the target pathogen.
In the field, SM treated soils exhibited resilience to re-infestation by Pratylenchus penetrans and Pythium spp. and correspondingly tree growth and yield was superior to that observed in fumigated soils.
After two years, the rhizosphere microbiome in fumigated soils had reverted to one similar to that of the no-treatment control, while that from the SM treatment possessed unique bacterial and fungal profiles.
Overall diversity of the microbiome was reduced in the SM treatment rhizosphere, suggesting that enhanced biodiversity was not instrumental in achieving system resilience and/or pathogen suppression.
Soil fumigation and SM treatment provided similar levels of disease control during the initial growing season.
In controlled studies, SM amendment resulted in development of a soil system suppressive towards disease incited by Pythium abappressorium and Rhizoctonia solani AG-5. The apparent functional mechanisms responsible for disease suppression differed with the target pathogen.
In the field, SM treated soils exhibited resilience to re-infestation by Pratylenchus penetrans and Pythium spp. and correspondingly tree growth and yield was superior to that observed in fumigated soils.
After two years, the rhizosphere microbiome in fumigated soils had reverted to one similar to that of the no-treatment control, while that from the SM treatment possessed unique bacterial and fungal profiles.
Overall diversity of the microbiome was reduced in the SM treatment rhizosphere, suggesting that enhanced biodiversity was not instrumental in achieving system resilience and/or pathogen suppression.
Publication
Authors
M. Mazzola, S.L. Strauss
Keywords
replant disease, soil microbiology, Brassica seed meal
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