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Evaluation of fluopyram for the control of Ditylenchus dipsaci in sugar beet

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

Figures & Tables

Figure 1:

Dose-response curves for immotile Ditylenchus dipsaci (%) after 24, 48, 72, and 96 h exposure to concentrations of 0, 1, 2, 3, 5, 10, 30, and 50 µg a.i./ml of fluopyram. Recovery of motility was determined by rinsing the a.i. of nematodes from the 72 h treatment and after further incubation for 24 h in water (= 72 hr + rinsed).
Dose-response curves for immotile Ditylenchus dipsaci (%) after 24, 48, 72, and 96 h exposure to concentrations of 0, 1, 2, 3, 5, 10, 30, and 50 µg a.i./ml of fluopyram. Recovery of motility was determined by rinsing the a.i. of nematodes from the 72 h treatment and after further incubation for 24 h in water (= 72 hr + rinsed).

Figure 2:

Effect of different fluopyram concentrations (0.0, 0.5, 1.0, 5.0, 10.0 µg/ml) applied either at planting or at BBCH 10 (cotyledons horizontally unfolded) on the number of Ditylenchus dipsaci per seedling (BBCH 11, first pair of leaves visible - not yet unfolded) seven days post-inoculation. Different letters over bars indicate significant differences at α =0 .05, according to the Tukey multiple comparisons of means.
Effect of different fluopyram concentrations (0.0, 0.5, 1.0, 5.0, 10.0 µg/ml) applied either at planting or at BBCH 10 (cotyledons horizontally unfolded) on the number of Ditylenchus dipsaci per seedling (BBCH 11, first pair of leaves visible - not yet unfolded) seven days post-inoculation. Different letters over bars indicate significant differences at α =0 .05, according to the Tukey multiple comparisons of means.

Figure 3:

Effect of fluopyram applied in-furrow at planting at 250 g a.i./ha, or in-band at BBCH 12 (two leaves unfolded) at either 125 or 250 g a.i./ha in the 2016 field trials at Bargen and Kappelen on the number of Ditylenchus dipsaci per plant 62 days post-planting. Different letters over bars indicate significant differences at α = 0.05 according to the Tukey multiple comparisons of means (n = 4). Field locations were not compared to each other.
Effect of fluopyram applied in-furrow at planting at 250 g a.i./ha, or in-band at BBCH 12 (two leaves unfolded) at either 125 or 250 g a.i./ha in the 2016 field trials at Bargen and Kappelen on the number of Ditylenchus dipsaci per plant 62 days post-planting. Different letters over bars indicate significant differences at α = 0.05 according to the Tukey multiple comparisons of means (n = 4). Field locations were not compared to each other.

Figure 4:

Effect of fluopyram applied in-furrow at planting at 250 g a.i./ha, or in-band at BBCH 12 (two leaves unfolded) at either 125 or 250 g a.i./ha in the 2016 field trials at Bargen and Kappelen on the rotting severity of the sugar beet root. Rotting index: 0 = no rot visible; 1 = ≤ 10% of rotten root; 2 = 11 to 33% of rotten root; 3 = 34 to 66% of rotten root; 4 = ≥ 67% of rotten root based on total root volume. Different letters over bars within a location indicate significant differences at α = 0.05 according to the Tukey multiple comparisons of means (n = 4). Field locations were not compared to each other.
Effect of fluopyram applied in-furrow at planting at 250 g a.i./ha, or in-band at BBCH 12 (two leaves unfolded) at either 125 or 250 g a.i./ha in the 2016 field trials at Bargen and Kappelen on the rotting severity of the sugar beet root. Rotting index: 0 = no rot visible; 1 = ≤ 10% of rotten root; 2 = 11 to 33% of rotten root; 3 = 34 to 66% of rotten root; 4 = ≥ 67% of rotten root based on total root volume. Different letters over bars within a location indicate significant differences at α = 0.05 according to the Tukey multiple comparisons of means (n = 4). Field locations were not compared to each other.

Effect of fluopyram applied in-furrow at planting at 250 g a_i_/ha, or in-band at BBCH 12 (two leaves unfolded) at either 125 or 250 g a_i_/ha in the 2016 field trials at Bargen and Kappelen on the number of Ditylenchus dipsaci (± SE) per plant 27 days post-planting and 1 day before the post-planting application (BBCH 12) compared to untreated plants_

Treatment/siteBargenKappelen
Untreated control4.4 ± 3.728.8 ± 11.3
125 g a.i./ha BBCH 124.6 ± 2.122.0 ± 6.8
250 g a.i./ha BBCH 124.4 ± 3.529.0 ± 9.9
250 g a.i./ha at planting1.0 ± 0.21.8 ± 1.7a**
ns

Estimated parameters for non-linear regression of the parameter inactive Ditylenchus dipsaci at different fluopyram exposure times (y) and concentrations (± SE)_

Parameter
Exposure time (y) b EC50 (µg/ml)a c d
24 h−1.17 ± 0.6546.73 ± 88.193.54 ± 3.19108.50 ± 119.46
48 h−1.68 ± 0.689.32 ± 2.275.11 ±  4.7096.03 ± 12.80
72 h−2.43 ± 0.483.98 ± 0.337.62 ± 3.52101.52 ± 4.01
96 h−2.27 ± 0.342.02 ± 0.165.56 ± 3.73101.68 ± 3.23
72 h + rinsed−2.11 ± 0.273.00 ± 0.224.98 ± 2.96101.96 ± 3.53

Effect of fluopyram applied at-planting or at BBCH 12 (two leaves unfolded) at concentrations of 0_0, 0_5, 1_0, and 5_0 µg/ml on the number of Ditylenchus dipsaci (± SE) per sugar beet plant 50 days post-planting in the glasshouse_

Fluopyram application
Fluopyram concentration (a.i.)at plantingBBCH 12
0.0 (µg/ml)27,681 ± 34,20812,344 ± 18,727
0.5 (µg/ml)16,782 ± 28,52113,750 ± 22,242
1.0 (µg/ml)23,901 ± 37,0668,596 ± 7,637
5.0 (µg/ml)20,315 ± 22,76514,126 ± 22,566
DOI: https://doi.org/10.21307/jofnem-2020-071 | Journal eISSN: 2640-396X | Journal ISSN: 0022-300X
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Language: English
Page range: 1 - 10
Published on: Jul 28, 2020
Published by: Society of Nematologists, Inc.
In partnership with: Paradigm Publishing Services
Publication frequency: 1 issue per year
Keywords:
Fluopyram,
Management,
Nematicide,
Nematode control,
Plant-parasitic nematode,
Sugar beet
Related subjects:
Life sciences,
Life sciences, other

© 2020 Alan Storelli, Andreas Keiser, Reinhard Eder, Samuel Jenni, Sebastian Kiewnick, published by Society of Nematologists, Inc.
This work is licensed under the Creative Commons Attribution 4.0 License.

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