Have a personal or library account? Click to login

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

Journal of Nematology
Volume 56 (2024): Issue 1 (March 2024)
By:
Open Access
|May 2024

Figures & Tables

Figure 1:

Relative abundance (proportion of total field PPN population) for each sampled field in the Spring of 2022 or 2023. Each column represents one sampled field and the total community of PPNs found in that field. Fields are organized by grass species and colored by the proportion of each PPN genus detected in the field. A column with no color (i.e., white) had undetectable populations of PPN. * indicates a field with fewer than four individual nematodes for the total population count.
Relative abundance (proportion of total field PPN population) for each sampled field in the Spring of 2022 or 2023. Each column represents one sampled field and the total community of PPNs found in that field. Fields are organized by grass species and colored by the proportion of each PPN genus detected in the field. A column with no color (i.e., white) had undetectable populations of PPN. * indicates a field with fewer than four individual nematodes for the total population count.

Figure 2:

Comparative PPN relative abundance (proportion of total field PPN population) in annual ryegrass and orchardgrass seed fields sampled in spring (top) and autumn (bottom) 2022. Each column represents one sampled field at either time point. Fields are organized by grass species and colored by the proportion of each PPN genus detected in a field. A column with no color (i.e., white) had undetectable populations of PPN. * indicates a field with fewer than four individual nematodes for the total population count.
Comparative PPN relative abundance (proportion of total field PPN population) in annual ryegrass and orchardgrass seed fields sampled in spring (top) and autumn (bottom) 2022. Each column represents one sampled field at either time point. Fields are organized by grass species and colored by the proportion of each PPN genus detected in a field. A column with no color (i.e., white) had undetectable populations of PPN. * indicates a field with fewer than four individual nematodes for the total population count.

Average plant-parasitic nematode species densities and diversity measures for all grass species sampled in 2022 and 2023_

Grass speciesNbSample timeAverage Density (#/100 g soil)Diversity Measuresa
PratylenchusMeloidogyneHelicotylenchusParatylenchusTylenchorhynchusXiphinemaAlphaBetaGamma
Annual ryegrass14Spring 20229020601001.90.63
Autumn 202203400000.70.41
Bentgrass3Spring 20231693800001.70.22
Fine fescue3Spring 20233000001.00.01
Orchardgrass7Spring 2022227582214102.11.45
Autumn 202202070011.11.73
Perennial ryegrass5Spring 20233611002.01.04
Tall fescue5Spring 2023166400011.60.93

Percentage frequency of occurrence (%FO), mean population densities when present (# nematodes/100 g soil), and maximum population densities (# nematodes/100 g soil) of plant-parasitic nematodes associated with grass for seed crops in Oregon sampled in Spring 2022 or 2023_

PratylenchusMeloidogyneHelicotylenchusParatylenchusTylenchorhynchusXiphinema
%FOa975416833
Meanb117 (30.2)172 (61.7)26 (18.2)32 (26.4)71
Maxc1,9842,496288556242

Pratylenchus spp_ identified on grass for seed crops in Oregon_a

Grass typeP. crenatusP. fallaxP. neglectusP. penetransP. thornei
Annual ryegrass+ (11)b+ (2)+ (9)+ (5)−c
Perennial ryegrassnddndndndnd
Bentgrass+ (3)−−−−
Tall fescue+ (1)−−−−
Fine fescuendndndndnd
Orchardgrass+ (1)−+ (6)+ (2)+ (2)
DOI: https://doi.org/10.2478/jofnem-2024-0020 | Journal eISSN: 2640-396X | Journal ISSN: 0022-300X
Journal RSS Feed
Language: English
Submitted on: Jan 5, 2024
Published on: May 10, 2024
Published by: Society of Nematologists, Inc.
In partnership with: Paradigm Publishing Services
Publication frequency: 1 times per year
Keywords:
grass for seed,
molecular identification,
Oregon,
survey
Related subjects:
Life sciences,
Life sciences, other

© 2024 H. M. Rivedal, I. A. Zasada, T. N. Temple, A. B. Peetz, L. A. Núñez-Rodríguez, R. J. Starchvick, E. T. Braithwaite, published by Society of Nematologists, Inc.
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Previous articleVolume 56 (2024): Issue 1 (March 2024)Next article