Effects of Pathogen Density, Soil Moisture, and Soil pH on Biological Control of Clubroot in Chinese Cabbage by Heteroconium chaetospira

Plant Disease
Kazuhiko NarisawaT Hashiba

Abstract

The effects of soil moisture and pH, and pathogen resting spore density, on the effectiveness of the biological control of clubroot by the fungal endophyte Heteroconium chaetospira was evaluated in greenhouse and field experiments. Conditions favoring disease development included low pH (5.5) and high soil moisture content (80%), with significant reductions in the disease being observed at a higher pH (6.3 and 7.2) and lower soil moisture content (40 and 60%). In greenhouse tests, H. chaetospira effectively controlled clubroot (reducing the disease by 90 to 100%) at pathogen resting spore densities of 104 and 105 spores/g of soil at all soil pHs tested (5.5, 6.3, and 7.2). However, when the resting spore density was 106 spores/g of soil, plants were severely diseased, regardless of treatment, and H. chaetospira had no effect on disease. At a soil moisture content of 40%, disease occurrence was low, regardless of pathogen spore density, but disease was significantly lower in H. chaetospira-treated plants at pathogen spore density of 105 spores/g of soil. At 60% soil moisture content, H. chaetospira significantly could affect at pathogen spore densities of 104 and 105 but not 104/g of soil. At 80% soil moisture content, there was...Continue Reading

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Citations

Sep 20, 2005·FEMS Microbiology Letters·Teruyoshi Hashiba, Kazuhiko Narisawa
Oct 3, 2018·Microbes and Environments·Yong Guo, Kazuhiko Narisawa
Jan 19, 2019·Plant Disease·Hervé Van der HeydenOdile Carisse
May 1, 2015·Plant Disease·Becke StrehlowChristine Struck
Sep 16, 2010·Phytopathology·Nguyen Đac KhoaHans Jørgen Lyngs Jørgensen

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