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

Alan Storelli
Alan Storelli
, 
Andreas Keiser
Andreas Keiser
, 
Reinhard Eder
Reinhard Eder
, 
Samuel Jenni
Samuel Jenni
 und 
Sebastian Kiewnick
Sebastian Kiewnick
   | 28. Juli 2020
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Online veröffentlicht: 28. Juli 2020
Seitenbereich: 1 - 10
DOI: https://doi.org/10.21307/jofnem-2020-071
Schlüsselwörter
© 2020 Alan Storelli et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.

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/site Bargen Kappelen
Untreated control 4.4 ± 3.7 28.8 ± 11.3
125 g a.i./ha BBCH 12 4.6 ± 2.1 22.0 ± 6.8
250 g a.i./ha BBCH 12 4.4 ± 3.5 29.0 ± 9.9
250 g a.i./ha at planting 1.0 ± 0.2 1.8 ± 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 ± 0.65 46.73 ± 88.19 3.54 ± 3.19 108.50 ± 119.46
48 h −1.68 ± 0.68 9.32 ± 2.27 5.11 ±  4.70 96.03 ± 12.80
72 h −2.43 ± 0.48 3.98 ± 0.33 7.62 ± 3.52 101.52 ± 4.01
96 h −2.27 ± 0.34 2.02 ± 0.16 5.56 ± 3.73 101.68 ± 3.23
72 h + rinsed −2.11 ± 0.27 3.00 ± 0.22 4.98 ± 2.96 101.96 ± 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 planting BBCH 12
0.0 (µg/ml) 27,681 ± 34,208 12,344 ± 18,727
0.5 (µg/ml) 16,782 ± 28,521 13,750 ± 22,242
1.0 (µg/ml) 23,901 ± 37,066 8,596 ± 7,637
5.0 (µg/ml) 20,315 ± 22,765 14,126 ± 22,566
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