Table 1.
Nematicide active ingredients, application rates, application methods, and application timing for the sweetpotatoes field experiments conducted at LSU AgCenter Northeast Research Station in 2021 and 2022. DBP refers to days before planting.
| Product | Active Ingredient | Product Application Rate | Application Rate (a.i.) | Application Method | Application Timing |
|---|---|---|---|---|---|
| Telone II | 1,3-dichloropropene | 74.8 L/ha | 84.9 kg/ha | Shank | 21 DBP |
| Velum | Fluopyram | 500 ml/ha | 238 g/ha | In-furrow | 2 DBP |
| Vydate | Oxamyl | 18.7 L/ha | 4.28 kg/ha | In-furrow | 2 DBP |
| Salibro | Fluazaindolizine | 2.24 L/ha | 1.12 kg/ha | In-furrow | 2 DBP |
| AgLogic | Aldicarb | 16.8 kg/ha | 2.52 kg/ha | In-furrow | 2 DBP |
| Majestene | Bacterial metabolites | 18.7 L/ha | - | In-furrow | 2 DBP |
| Nimitz | Fluensulfone | 8.18 L/ha | 3.92 kg/ha | In-furrow | 2 DBP |
Table 2.
2021 effect of soil treatment on the abundance of reniform nematode (Rotylenchulus reniformis) in soil planted with sweetpotato at the LSU AgCenter Northeast Research Station in 2021. Soil treatments sharing the same letter within a column do not differ significantly (P > 0.05), according to Tukey's HSD test.
| Pre-Fum | At Plant | Mid-Season | Harvest | ||||
|---|---|---|---|---|---|---|---|
| Control | 4,125 | 1,188 | a | 5,575 | a | 5,875 | a |
| 1,3-dichloropropene | 3,000 | 188 | b | 350 | b | 1,963 | b |
| Fluopyram | 4,625 | 1,750 | a | 1,825 | b | 2,575 | b |
| Oxamyl | 1,000 | 1,438 | a | 888 | b | 3,148 | ab |
| Fluazaindolizine | 4,625 | 1,500 | a | 3,170 | ab | 3,395 | ab |
| Aldicarb | 5,500 | 1,063 | a | 1,950 | b | 2,200 | b |
| Majestene | 1,625 | 1,250 | a | 2,468 | ab | 2,968 | ab |
| Fluensulfone | 3,500 | 1,625 | a | 3,188 | ab | 3,438 | ab |
| P-value | 0.193 | 0.014 | <0.001 | 0.004 |
Table 3.
2022 effect of soil treatment on the abundance of reniform nematode (Rotylenchulus reniformis) in soil planted with sweetpotato at the LSU AgCenter Northeast Research Station in 2022. Soil treatments sharing the same letter within a column do not differ significantly (P > 0.05), according to Tukey's HSD test.
| Pre-Fum | At Plant | Mid-Season | Harvest | |||
|---|---|---|---|---|---|---|
| Control | 1,425 | 1,500 | a | 3,000 | ab | 5,300 |
| 1,3-dichloropropene | 1,000 | 300 | b | 1,175 | b | 3,015 |
| Fluopyram | 1,650 | 1,250 | a | 1,500 | ab | 3,800 |
| Oxamyl | 1,275 | 1,425 | a | 2,600 | ab | 4,775 |
| Fluazaindolizine | 975 | 925 | ab | 3,150 | ab | 4,050 |
| Aldicarb | 1,675 | 1,275 | a | 1,525 | ab | 2,375 |
| Majestene | 1,400 | 1,125 | a | 3,500 | a | 4,325 |
| Fluensulfone | 1,150 | 975 | ab | 2,025 | ab | 4,400 |
| P-value | 0.432 | 0.029 | 0.008 | 0.529 |
Table 4.
2021 effect of soil treatment on the yield of US#1, canner, and jumbo grade sweetpotato harvest at the LSU AgCenter Northeast Research Station. Soil treatments sharing the same letter within a column do not differ significantly (P > 0.05), according to Tukey's HSD test.
| U.S.#1 | Canner | Jumbo | Total Marketable Yield | ||
|---|---|---|---|---|---|
| Control | 6.8 | ab | 7.4 | 0.1 | 14.2 |
| 1,3-dichloropropene | 9.2 | a | 6.5 | 1.0 | 16.7 |
| Fluopyram | 8.9 | ab | 9.1 | 0.4 | 18.4 |
| Oxamyl | 5.5 | b | 7.9 | 0.8 | 14.3 |
| Fluazaindolizine | 6.2 | ab | 8.3 | 0.5 | 15.0 |
| Aldicarb | 5.5 | b | 8.0 | 1.9 | 15.4 |
| Majestene | 9.6 | a | 8.1 | 0.3 | 18.0 |
| Fluensulfone | 7.0 | ab | 8.4 | 0.6 | 15.9 |
| P-value | 0.017 | 0.892 | 0.493 | 0.425 |
Table 5.
2022 effect of soil treatment on the yield of US#1, canner, and jumbo grade sweetpotato harvest at the LSU AgCenter Northeast Research Station. Soil treatments sharing the same letter within a column do not differ significantly (P > 0.05), according to Tukey's HSD test.
| U.S.#1 | Canner | Jumbo | Total Marketable Yield | ||
|---|---|---|---|---|---|
| Control | 7.4 | b | 3.4 | 1.8 | 12.6 |
| 1,3-dichloropropene | 9.7 | ab | 4.4 | 3.0 | 17.1 |
| Fluopyram | 9.0 | ab | 3.7 | 1.0 | 13.6 |
| Oxamyl | 12.0 | a | 2.8 | 0.7 | 15.5 |
| Fluazaindolizine | 9.4 | ab | 3.6 | 3.5 | 16.5 |
| Aldicarb | 11.1 | a | 3.7 | 1.7 | 16.5 |
| Majestene | 9.2 | ab | 3.6 | 2.3 | 15.1 |
| Fluensulfone | 5.3 | b | 3.3 | 2.3 | 10.9 |
| P-value | 0.017 | 0.908 | 0.396 | 0.498 |
Table 6.
Effect of soil treatment and experimental repetition on the final abundanceof reniform nematode (Rotylenchulus reniformis) in soil and storage root weight of sweetpotato planted into potted field soil from the LSU AgCenter Northeast Research Station. Soil treatments sharing the same letter within a column do not differ significantly (P > 0.05), according to Tukey's HSD test.
| Factor | Level | Rotylenchulus reniformis per 500 ml soil | Storage Root Weight (g) | ||
|---|---|---|---|---|---|
| Soil Treatment | Untreated | 31,060 | a | 15.5 | b |
| Pasteurized | 3,515 | c | 19.0 | ab | |
| Fluopyram | 15,790 | b | 18.7 | b | |
| Oxamyl | 29,350 | ab | 17.6 | b | |
| Fluazaindolizine | 15,540 | b | 18.1 | b | |
| Aldicarb | 36,890 | a | 22.2 | ab | |
| Majestene | 29,110 | ab | 30.6 | a | |
| Fluensulfone | 29,400 | ab | 16.7 | a | |
| Experiment | 1 | 18825 | b | 25.1 | a |
| 2 | 35465 | a | 14.5 | b | |
| P-value | Soil Treatment | <0.001 | 0.005 | ||
| Experiment | <0.001 | <0.001 | |||
| Interaction | 0.122 | 0.073 | |||
Table 7.
Effect of soil treatment and experimental repetition on the final abundance of reniform nematode (Rotylenchulus reniformis) in soil and storage root weight of sweetpotato planted into potted field soil from the LSU AgCenter Macon Ridge Research Station. Soil treatments sharing the same letter within a column do not differ significantly (P > 0.05), according to Tukey's HSD test.
| Factor | Level | Rotylenchulus reniformis per 500 ml soil | Storage Root Weight (g) | |
|---|---|---|---|---|
| Soil Treatment | Untreated | 13,790 | a | 29.8 |
| Pasteurized | 2,155 | c | 32.1 | |
| Fluopyram | 10,560 | ab | 21.8 | |
| Oxamyl | 8,340 | ab | 30.5 | |
| Fluazaindolizine | 10,295 | ab | 36.0 | |
| Aldicarb | 6,575 | b | 31.1 | |
| Majestene | 11,055 | ab | 30.7 | |
| Fluensulfone | 6,890 | b | 28.4 | |
| Experiment | 1 | 9,435 | 32.0 | |
| 2 | 8,025 | 28.0 | ||
| P-value | Soil Treatment | 0.045 | 0.530 | |
| Experiment | 0.136 | 0.188 | ||
| Interaction | 0.749 | 0.701 | ||