<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>Plant-parasitic nematodes (PPN) are an understudied pathogen group in the Oregon cool-season grass seed cropping system. In this survey, the PPN associated with annual ryegrass, bentgrass, fine fescue, orchardgrass, perennial ryegrass, and tall fescue were determined. Thirty-seven fields were sampled in the 2022 or 2023 growing season by collecting 10 soil cores in each of six 100-m transects for nematode extraction and visual identification. PerMANOVA testing indicated significant differences in PPN community composition across grass host and sampling time. <italic>Pratylenchus</italic> and <italic>Meloidogyne</italic> were the most commonly encountered nematodes, with maximum population densities of 1,984 and 2,496 nematodes/100 g soil, respectively. Sequencing of the COX1 gene region indicated the presence of <italic>P. crenatus, P. fallax, P. neglectus, P. penetrans</italic>, and <italic>P. thornei</italic>, with some of these species being detected for the first time on these grass hosts. The only <italic>Meloidogyne</italic> sp. found in these grasses was <italic>M. nassi</italic>, based upon sequencing of the ITS gene region. This first-of-its-kind survey indicates the need for further assessment of the impact of these PPNs on yield and stand longevity in cool-season grass seed fields in Oregon.</p>
</abstract>

Plant-parasitic nematodes (PPN) are an understudied pathogen group in the Oregon cool-season grass seed cropping system. In this survey, the PPN associated with annual ryegrass, bentgrass, fine fescue, orchardgrass, perennial ryegrass, and tall fescue were determined. Thirty-seven fields were sampled in the 2022 or 2023 growing season by collecting 10 soil cores in each of six 100-m transects for nematode extraction and visual identification. PerMANOVA testing indicated significant differences in PPN community composition across grass host and sampling time. Pratylenchus and Meloidogyne were the most commonly encountered nematodes, with maximum population densities of 1,984 and 2,496 nematodes/100 g soil, respectively. Sequencing of the COX1 gene region indicated the presence of P. crenatus, P. fallax, P. neglectus, P. penetrans, and P. thornei, with some of these species being detected for the first time on these grass hosts. The only Meloidogyne sp. found in these grasses was M. nassi, based upon sequencing of the ITS gene region. This first-of-its-kind survey indicates the need for further assessment of the impact of these PPNs on yield and stand longevity in cool-season grass seed fields in Oregon.

Plant-parasitic Nematodes Associated with Grasses Grown for Seed in the Willamette Valley of Oregon

USDA-ARS Forage Seed and Cereal Research Unit

USDA-ARS Horticultural Crops Disease and Pest Management Unit

Journal of Nematology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Plant-parasitic nematodes (PPN) are an understudied pathogen group in the Oregon cool-season grass seed cropping system. In this survey, the PPN associated...

Plant-parasitic Nematodes Associated with Grasses Grown for Seed in the Willamette Valley of Oregon

Article Category: Research Paper

Publicado en línea: 10 may 2024

Páginas: -

Recibido: 05 ene 2024

DOI: https://doi.org/10.2478/jofnem-2024-0020

Palabras clave
grass for seed, molecular identification, Oregon, survey

© 2024 H. M. Rivedal et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Plant-parasitic Nematodes Associated with Grasses Grown for Seed in the Willamette Valley of Oregon

Article Category: Research Paper

Publicado en línea: 10 may 2024

Páginas: -

Recibido: 05 ene 2024

DOI: https://doi.org/10.2478/jofnem-2024-0020

Palabras clavegrass for seed, molecular identification, Oregon, survey

© 2024 H. M. Rivedal et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Palabras clave
grass for seed, molecular identification, Oregon, survey