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Meloidogyne incognita Management Using Fumigant and Non-fumigant Nematicides on Sweet Potato

Chang Liu
Chang Liu
 y 
Zane Grabau
Zane Grabau
   | 29 jul 2022
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Article Category: Research Paper
Publicado en línea: 29 jul 2022
Páginas: -
Recibido: 14 mar 2022
DOI: https://doi.org/10.2478/jofnem-2022-0026
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© 2022 Liu and Grabau. published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.

Figure 1

Nematicide effects on Meloidogyne incognita J2 soil abundances at preplant, midseason, and harvest in 2018 trials. Within each subfigure, means with different letters are significantly different (P < 0.05) based on Fisher’s protected LSD. “Fluaz. 1.12” and “Fluaz. 2.24” indicate fluazaindolizine at 1.12 kg a.i./ha and 2.24 kg a.i./ha, respectively. “Fluop.” Indicates fluopyram.
Nematicide effects on Meloidogyne incognita J2 soil abundances at preplant, midseason, and harvest in 2018 trials. Within each subfigure, means with different letters are significantly different (P < 0.05) based on Fisher’s protected LSD. “Fluaz. 1.12” and “Fluaz. 2.24” indicate fluazaindolizine at 1.12 kg a.i./ha and 2.24 kg a.i./ha, respectively. “Fluop.” Indicates fluopyram.

Figure 2

Nematicide effects on Meloidogyne incognita J2 soil abundances at preplant, midseason, and harvest in 2019 trials. Within each subfigure, means with different letters are significantly different (P < 0.05) based on Fisher’s protected LSD. “Fluaz. 1.12” and “Fluaz. 2.24” indicate fluazaindolizine at 1.12 kg a.i./ha and 2.24 kg a.i./ha, respectively. “Fluop.” Indicates fluopyram.
Nematicide effects on Meloidogyne incognita J2 soil abundances at preplant, midseason, and harvest in 2019 trials. Within each subfigure, means with different letters are significantly different (P < 0.05) based on Fisher’s protected LSD. “Fluaz. 1.12” and “Fluaz. 2.24” indicate fluazaindolizine at 1.12 kg a.i./ha and 2.24 kg a.i./ha, respectively. “Fluop.” Indicates fluopyram.

Figure 3

Nematicide effects on Meloidogyne incognita J2 soil abundances at preplant, midseason, and harvest in 2020 trials. Within each subfigure, means with different letters are significantly different (P < 0.05) based on Fisher’s protected LSD. “Fluaz. 1.12” and “Fluaz. 2.24” indicate fluazaindolizine at 1.12 kg a.i./ha and 2.24 kg a.i./ha, respectively. “Fluop.” Indicates fluopyram.
Nematicide effects on Meloidogyne incognita J2 soil abundances at preplant, midseason, and harvest in 2020 trials. Within each subfigure, means with different letters are significantly different (P < 0.05) based on Fisher’s protected LSD. “Fluaz. 1.12” and “Fluaz. 2.24” indicate fluazaindolizine at 1.12 kg a.i./ha and 2.24 kg a.i./ha, respectively. “Fluop.” Indicates fluopyram.

Figure 4

Nematicide effects on free-living nematode soil abundances at preplant, midseason, and harvest in 2018 trial. Within each subfigure, means with different letters are significantly different (P < 0.05) based on Fisher’s protected LSD. “Fluaz. 1.12” and “Fluaz. 2.24” indicate fluazaindolizine at 1.12 kg a.i./ha and 2.24 kg a.i./ha, respectively. “Fluop.” Indicates fluopyram.
Nematicide effects on free-living nematode soil abundances at preplant, midseason, and harvest in 2018 trial. Within each subfigure, means with different letters are significantly different (P < 0.05) based on Fisher’s protected LSD. “Fluaz. 1.12” and “Fluaz. 2.24” indicate fluazaindolizine at 1.12 kg a.i./ha and 2.24 kg a.i./ha, respectively. “Fluop.” Indicates fluopyram.

Figure 5

Nematicide effects on free-living nematode soil abundances at preplant, midseason, and harvest in 2019 trial. Within each subfigure, means with different letters are significantly different (P < 0.05) based on Fisher’s protected LSD. “Fluaz. 1.12” and “Fluaz. 2.24” indicate fluazaindolizine at 1.12 kg a.i./ha and 2.24 kg a.i./ha, respectively. “Fluop.” Indicates fluopyram.
Nematicide effects on free-living nematode soil abundances at preplant, midseason, and harvest in 2019 trial. Within each subfigure, means with different letters are significantly different (P < 0.05) based on Fisher’s protected LSD. “Fluaz. 1.12” and “Fluaz. 2.24” indicate fluazaindolizine at 1.12 kg a.i./ha and 2.24 kg a.i./ha, respectively. “Fluop.” Indicates fluopyram.

Figure 6

Nematicide effects on free-living nematode soil abundances at preplant, midseason, and harvest in 2020 trial. Within each subfigure, means with different letters are significantly different (P < 0.05) based on Fisher’s protected LSD. “Fluaz. 1.12” and “Fluaz. 2.24” indicate fluazaindolizine at 1.12 kg a.i./ha and 2.24 kg a.i./ha, respectively. “Fluop.” Indicates fluopyram.
Nematicide effects on free-living nematode soil abundances at preplant, midseason, and harvest in 2020 trial. Within each subfigure, means with different letters are significantly different (P < 0.05) based on Fisher’s protected LSD. “Fluaz. 1.12” and “Fluaz. 2.24” indicate fluazaindolizine at 1.12 kg a.i./ha and 2.24 kg a.i./ha, respectively. “Fluop.” Indicates fluopyram.

Figure 7

Nematicide effects on total sweet potato tuber yield in 2018, 2019, and 2020 trials. Within each subfigure, means with different letters are significantly different (P < 0.05) based on Fisher’s protected LSD. “Fluaz. 1.12” and “Fluaz. 2.24” indicate fluazaindolizine at 1.12 kg a.i./ha and 2.24 kg a.i./ha, respectively. “Fluop.” Indicates fluopyram.
Nematicide effects on total sweet potato tuber yield in 2018, 2019, and 2020 trials. Within each subfigure, means with different letters are significantly different (P < 0.05) based on Fisher’s protected LSD. “Fluaz. 1.12” and “Fluaz. 2.24” indicate fluazaindolizine at 1.12 kg a.i./ha and 2.24 kg a.i./ha, respectively. “Fluop.” Indicates fluopyram.

Figure 8

Nematicide effects on marketable sweet potato tuber yield in 2018, 2019, and 2020 trials. Within each subfigure, means with different letters are significantly different (P < 0.05) based on Fisher’s protected LSD. “Fluaz. 1.12” and “Fluaz. 2.24” indicate fluazaindolizine at 1.12 kg a.i./ha and 2.24 kg a.i./ha, respectively. “Fluop.” Indicates fluopyram.
Nematicide effects on marketable sweet potato tuber yield in 2018, 2019, and 2020 trials. Within each subfigure, means with different letters are significantly different (P < 0.05) based on Fisher’s protected LSD. “Fluaz. 1.12” and “Fluaz. 2.24” indicate fluazaindolizine at 1.12 kg a.i./ha and 2.24 kg a.i./ha, respectively. “Fluop.” Indicates fluopyram.

Schedule for data collection and trial maintenance in 2018–2020.

Task 2018 2019 2020
Preplant soil sample May 16 (37 DBP)a May 4 (40 DBP) May 18 (24 DBP)
Fumigation May 22 (31 DBP) May 13 (31 DBP) May 22 (20 DBP)
Nematicide broadcast spray applicationsb June 11 (11 DBP) June 4 (9 DBP) June 3 (8 DBP)
Sweet potato planted June 22 June 13 June 11
Midseason soil sample August 23 (64 DAP) August 16 (64 DAP) August 3 (53 DAP)
Harvest soil sample October 4 (106 DAP) October 31 (139 DAP) November 6 (149 DAP)
Sweet potato harvest October 23 (127 DAP) November 1 (140 DAP) November 11 (154 DAP)

Sweet potato tuber yield (Mg/ha) by grade category and tuber gall rating as affected by nematicide treatments in 2019 and 2020.a

Treatment USDA 1 (Mg/ha)b USDA 2 (Mg/ha) Defects (Mg/ha) Size outliers (Mg/ha) Percent defectsc Tuber galling (%)d
2019
Control 1.03 b 2.31 16.2 0.47 b 84 0.41
Fluazaindolizine 2.76 ab 2.60 16.29 0.87 ab 74 1.06
1.12 kg/ha
Fluazaindolizine 2.40 b 4.84 17.56 0.94 ab 68 0.03
2.24 kg/ha
Fluazaindolizine 4.46 a 4.70 16.82 2.49 a 60 0.21
1.12 kg/ha + oxamyl
1,3-D 1.59 b 4.17 20.99 0.85 ab 76 0.67
Fluopyram 0.85 b 4.30 16.06 1.03 ab 73 1.14
Oxamyl 2.51 b 4.97 14.92 0.27 b 67 0.57
2020
Control 1.73 b 1.93 b 11.02 0.27 73 a 7.14 ab
Fluazaindolizine 1.57 b 2.80 b 13.71 0.25 75 a 8.51 a
1.12 kg/ha
Fluazaindolizine 1.84 b 2.24 b 12.84 0.34 76 a 6.18 ab
2.24 kg/ha
Fluazaindolizine 1.99 b 2.62 b 11.45 0.29 69 ab 8.22 a
1.12 kg/ha + oxamyl
1,3-D 7.64 a 8.33 a 20.16 0.20 55 b 0.60 c
Fluopyram 1.84 b 2.04 b 17.03 0.27 81 a 3.93 bc
Oxamyl 1.99 b 1.86 b 13.35 0.27 78 a 6.50 ab

Nematicide application treatment rates and application methods in 2018–2020 trials.

Treatment Product Active ingredient Product application rate Application rate (a.i.) Application method
1 Untreated control
2 Salibroa Fluazaindolizine 2.24 L/ha 1.12 kg/ha Broadcast spray
3 Salibro Fluazaindolizine 4.48 L/ha 2.24 kg/ha Broadcast spray
4 Salibro + Vydate Lb Fluazaindolizine + oxamyl 2.24 L/ha + 9.35 L/ ha 1.12 kg/ha + 2.14 kg/ha Broadcast spray
5 Telone IIb 1,3-D 74 L/ha 84 kg/ha Broadcast shank fumigation
6 Velum Primec Fluopyram 499 mL/ha 238 g/ha Broadcast spray (2018–2019) Drench (2020)
7 Vydate L Oxamyl 9.35 L/ha 2.14 kg/ha Broadcast spray
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