Effect of spore inoculum and agricultural practices on the vertical distribution of the biocontrol plant-growth-promoting bacterium <Emphasis Type="Italic">Pasteuria penetrans</Emphasis> and growth of <Emphasis Type="Italic">Meloidogyne incognita</Emphasis>-infected tomato |
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| Authors: | Miguel Talavera Takayuki Mizukubo Kenji Ito Satoshi Aiba |
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| Institution: | 1.National Agricultural Research Center, Department of Entomology and Nematology, 3–1-1 Kannondai, Tsukuba, Ibaraki 305–8666, Japan, |
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| Abstract: | Three concentrations of Pasteuria spores applied to soil and some agricultural practices were evaluated for their effects on spore attachment to nematodes and biocontrol of Meloidogyne incognita on tomato in a microplot experiment. Applications of Pasteuria at concentrations of 5᎒10 spores/m2 increased tomato fruit yield per plant by 46% compared to non-Pasteuria treatments but also increased nematode densities in soil at harvest time. M. incognita juveniles recovered from plots where Pasteuria was applied at 5᎒10 spores/m2 showed greater spore attachment than those with application rates of 2.5᎒9 spores/m2 or 5᎒9 spores/m2. Pasteuria spores penetrated to 30-40 cm soil depth in a volcanic ash sandy soil after application of spore suspensions to the soil surface. Densities of over 2.5᎒4 spores/g of soil were reached at 0-30 cm soil depth only when the application rate was 5᎒10 spores/m2, but at harvest and after fallow densities of about 2.5᎒4 spores/g of soil were also reached in the top 10 cm of soil at 2.5᎒9 and 5᎒9 spores/m2 application rates. Spore densities in soil decreased after 6 months of fallow when densities at harvest time were higher than 105 spores/g of soil. Tillage and additional watering 2 days after spore application increased spore densities in soil at harvest throughout the soil depth (0-40 cm). |
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