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Soil texture, infective juvenile concentration, and soil organic matter influence the efficacy of Steinernema feltiae isolate Lican Ray

Journal of Nematology
Volume 52 (2020): Issue 1 (January 2020)
By:
Open Access
|Mar 2020

Figures & Tables

Figure 1:

Through the lateral opening of this t-shaped PVC matrix (A), a modified Petri dish containing soil and larvae is introduced. A removable lid with a metallic mesh for gas exchange covers the lateral opening (B). IJs are pipetted through the upper opening (C).
Through the lateral opening of this t-shaped PVC matrix (A), a modified Petri dish containing soil and larvae is introduced. A removable lid with a metallic mesh for gas exchange covers the lateral opening (B). IJs are pipetted through the upper opening (C).

Figure 2:

Boxplot showing percentage of last instar larvae Galleria mellonella mortality at (I) three, (II) six and (III) nine DAI, inoculated with 440, 2,200 or 4,400 IJs/5 mL of Steinernema feltiae LR in clay (C), loam (L) or sandy loam (S) soil, corrected according to the Schneider-Orelli’s formula). In (I) bars with different capital letters indicate statistical differences for soil texture (Tukey’s test; p ≤ 0.05). In (II) and (III) bars with different lower-case letter indicates statistical differences for the interaction between IJ concentration and soil texture (Tukey’s test; p ≤ 0.05). In Figs. 2–4, boxes represent the third quartile (75th percentile), median (50th percentile), first quartile (25th percentile), and mean percentage (x) of five replicates, with upper whiskers reaching Q3 +1.5×interquartile range (IQR) and lower whiskers Q1−1.5 × IQR.
Boxplot showing percentage of last instar larvae Galleria mellonella mortality at (I) three, (II) six and (III) nine DAI, inoculated with 440, 2,200 or 4,400 IJs/5 mL of Steinernema feltiae LR in clay (C), loam (L) or sandy loam (S) soil, corrected according to the Schneider-Orelli’s formula). In (I) bars with different capital letters indicate statistical differences for soil texture (Tukey’s test; p ≤ 0.05). In (II) and (III) bars with different lower-case letter indicates statistical differences for the interaction between IJ concentration and soil texture (Tukey’s test; p ≤ 0.05). In Figs. 2–4, boxes represent the third quartile (75th percentile), median (50th percentile), first quartile (25th percentile), and mean percentage (x) of five replicates, with upper whiskers reaching Q3 +1.5×interquartile range (IQR) and lower whiskers Q1−1.5 × IQR.

Figure 3:

Boxplot showing percentage of last instar larvae Galleria mellonella mortality at a distance of 10, 20, 30 or 40 cm horizontally from the inoculation point of IJ of Steinernema feltiae LR in clay (C), loam (L) or sandy loam (S) soil at (I) three, (II) six and (III) nine DAI. Bars with different letter in each evaluation time, indicate statistical differences, according to Tukey’s test (p ≤ 0.05).
Boxplot showing percentage of last instar larvae Galleria mellonella mortality at a distance of 10, 20, 30 or 40 cm horizontally from the inoculation point of IJ of Steinernema feltiae LR in clay (C), loam (L) or sandy loam (S) soil at (I) three, (II) six and (III) nine DAI. Bars with different letter in each evaluation time, indicate statistical differences, according to Tukey’s test (p ≤ 0.05).

Figure 4:

Boxplot showing percentage of last instar larvae Galleria mellonella mortality at a distance of 30, 50 or 70 cm vertically from the inoculation point of IJ of Steinernema feltiae LR in clay (C), loam (L) or sandy loam (S) soil at (I) three, six (II) and (III) nine DAI. Bars with different letter in each evaluation time, indicate statistical differences, according to Tukey’s test (p ≤ 0.05).
Boxplot showing percentage of last instar larvae Galleria mellonella mortality at a distance of 30, 50 or 70 cm vertically from the inoculation point of IJ of Steinernema feltiae LR in clay (C), loam (L) or sandy loam (S) soil at (I) three, six (II) and (III) nine DAI. Bars with different letter in each evaluation time, indicate statistical differences, according to Tukey’s test (p ≤ 0.05).

Figure 5:

Boxplots showing percentage of last instar larvae Galleria mellonella mortality caused by Steinernema feltiae LR in loam soil at two and four DAI with 0, 2, 4, 6 or 8% OM. Bars with different letters indicate statistical differences, according to Tukey’s test (p ≤ 0.05) (lower case for two DAI and capital letters for four DAI). In figs 5 and 6, boxes represent the third quartile (75th percentile), median (50th percentile), first quartile (25th percentile), and mean percentage (x) of 15 replicates, with upper whiskers reaching Q3 + 1.5 × interquartile range (IQR) and lower whiskers Q1−1.5 × IQR. Outliers beyond the boxes limits are plotted as individual points.
Boxplots showing percentage of last instar larvae Galleria mellonella mortality caused by Steinernema feltiae LR in loam soil at two and four DAI with 0, 2, 4, 6 or 8% OM. Bars with different letters indicate statistical differences, according to Tukey’s test (p ≤ 0.05) (lower case for two DAI and capital letters for four DAI). In figs 5 and 6, boxes represent the third quartile (75th percentile), median (50th percentile), first quartile (25th percentile), and mean percentage (x) of 15 replicates, with upper whiskers reaching Q3 + 1.5 × interquartile range (IQR) and lower whiskers Q1−1.5 × IQR. Outliers beyond the boxes limits are plotted as individual points.

Figure 6:

Boxplots showing percentage of last instar larvae Galleria mellonella mortality caused by Steinernema feltiae LR in loam soil at two and four DAI with OM at different decomposition degrees (initial, medium and advanced) control soil (unknown) and soil with no OM (calcined). Bars with different letters on bars indicate statistical differences, according to Tukey’s test (p ≤ 0.05) (lower case for two DAI and capital letters for four DAI).
Boxplots showing percentage of last instar larvae Galleria mellonella mortality caused by Steinernema feltiae LR in loam soil at two and four DAI with OM at different decomposition degrees (initial, medium and advanced) control soil (unknown) and soil with no OM (calcined). Bars with different letters on bars indicate statistical differences, according to Tukey’s test (p ≤ 0.05) (lower case for two DAI and capital letters for four DAI).

Physical properties of the soils used_

Volumetric water content (%)Texture (%)
Textural classesFCPWPAWCSCSi
Clay39.019.020.019.052.019.0
Sandy loam18.08.99.169.28.622.2
Loam22.014.08.038.820.840.4

Chemical analysis of organic matter (OM) used, at different degrees of decomposition_

Content (%)Content (ppm)
OM decomposition degreeOMOrganic carbonTotal nitrogenNitrateAmmonium
Initial8549.72.66147142
Medium1810.51.2649528
Advanced1810.50.9833518
DOI: https://doi.org/10.21307/jofnem-2020-007 | Journal eISSN: 2640-396X | Journal ISSN: 0022-300X
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Language: English
Page range: 1 - 11
Submitted on: Oct 25, 2019
Published on: Mar 18, 2020
Published by: Society of Nematologists, Inc.
In partnership with: Paradigm Publishing Services
Publication frequency: 1 issue per year
Keywords:
Entomopathogenic nematodes,
Clay soil,
Loam soil,
Organic matter,
Sandy loam soil.
Related subjects:
Life sciences,
Life sciences, other

© 2020 Gabriela Lankin, Giselle Vidal-Retes, Geraldine Allende, Carlos Castaneda-Alvarez, Ernesto San-Blas, Erwin Aballay, published by Society of Nematologists, Inc.
This work is licensed under the Creative Commons Attribution 4.0 License.

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