Table 1:
Schedule for data collection and trial establishment. Numbers in parentheses are days after planting.
| Event | 2022 | 2023 |
|---|---|---|
| Preplant soil sampling | 28 April (0) | 8 May (0) |
| Planting | 28 April (0) | 8 May (0) |
| Stand count 1 | 10 May (12) | 22 May (14) |
| Vigor rating 1 | 9 June (42) | 19 June (42) |
| Vigor rating 2 | 5 July (68) | 21 July (74)a |
| Vigor rating 3 | 2 Aug (95) | 28 Aug (112)b |
| Midseason soil sampling | 9 June (42) | 22 June (42) |
| Midseason root sampling | 9 June (42) | 22 June (45) |
| Harvest soil sampling | 6 Sep (129) | 6 Sep (121) |
| Leafspot and stem rot rating | 20 Sep (143) | 19 Sep (134) |
| Peanut inverting | 20 Sep (143) | 19 Sep (134) |
| Peanut combining | 22 Sep (145) | 25 Sep (137) |
Figure 1:
Peanut root-knot nematode egg abundances from peanut roots at midseason (6 weeks after planting) in 2022 and 2023 as affected by cultivars and nematicide treatment. “B-II Fluop.” indicates Bailey II cultivar with infurrow fluopyram application. Other treatment names indicate cultivars without nematicide application. Within each subfigure, means with different letters are significantly different (Fisher’s protected LSD, α = 0.05).
Figure 2:
Peanut root-knot nematode soil abundances before planting, at midseason (6 weeks after planting), and at harvest in 2022 and 2023 as affected by cultivars and nematicide treatment. “B-II Fluop.” indicates Bailey II cultivar with in-furrow fluopyram application. Other treatment names indicate cultivars without nematicide application. Within each subfigure, means with different letters are significantly different (Fisher’s protected LSD, α = 0.05).
Figure 3:
Ring nematode soil abundances before planting, at midseason (6 weeks after planting), and at harvest in 2022 and 2023 as affected by cultivars and nematicide treatment. “B-II Fluop.” indicates Bailey II cultivar with in-furrow fluopyram application. Other treatment names indicate cultivars without nematicide application. Within each subfigure, means with different letters are significantly different (Fisher’s protected LSD, α = 0.05).
Figure 4:
Peanut yield and marginal return on investment in 2022 and 2023 as affected by cultivars and nematicide treatment. “B-II Fluop.” indicates Bailey II cultivar with in-furrow fluopyram application. Other treatment names indicate cultivars without nematicide application. Marginal return (in US Dollars) is relative to mean income (crop value minus product cost only) for Bailey II. Within each subfigure, means with different letters differ significantly (Fisher’s protected LSD, α = 0.05).
Table 2:
Cultivar and nematicide effects on agronomic measurements in 2022 and 2023 trials. Numbers in parentheses are days after planting.
| Stand (12) | Root weight (42)b | Shoot weight (42)b | Vigor (42) | Vigor (68) | Vigor (95) | Stem rot (143)c | Leafspot (143)d | |
|---|---|---|---|---|---|---|---|---|
| Bailey II | 3.0 a | 4.6 | 42 a | 87 a | 89 a | 85 a | 1 | 5.8 a |
| Bailey II + Fluopyram | 2.8 ab | 3.6 | 34 a | 88 ab | 95 a | 85 a | 1 | 6.3 a |
| TifJumbo | 2.5 b | 3.9 | 33 ab | 67 c | 63 b | 74 b | 1 | 4.7 b |
| Georgia-19HP | 2.5 b | 3.5 | 21 b | 77 bc | 50 b | 59 c | 2 | 3.5 c |
| Stand (14) | Root weight (42) | Shoot weight (42) | Vigor (42) | Vigor (74) | Vigor (112) | Stem rot (134) | Leafspot (134) | |
|---|---|---|---|---|---|---|---|---|
| Bailey II | 2.1 b | 5.3 | 76 | 53 b | 68 ab | 70 ab | 1 b | 0.0 b |
| Bailey II + Fluopyram | 1.9 b | 5.8 | 81 | 60 a | 72 a | 73 a | 1 b | 0.7 ab |
| TifJumbo | 2.6 a | 5.6 | 78 | 56 ab | 63 bc | 68 b | 1 b | 0.0 b |
| Georgia-19HP | 2.7 a | 5.3 | 60 | 55 ab | 59 c | 62 c | 3 a | 1.8 a |
a Different letters for the same variable and year indicate significantly different means based on Fisher’s protected LSD at α = 0.05.
d Leafspot is leafspot severity rating on a Florida 1–10 scale, where 10 is the most severe (Chiteka et al., 1988)
Figure 5:
Total free-living nematode soil abundances before planting, at midseason (6 weeks after planting), and at harvest in 2022 and 2023 as affected by cultivars and nematicide treatment. “B-II Fluop.” indicates Bailey II cultivar with in-furrow fluopyram application. Other treatment names indicate cultivars without nematicide application. Within each subfigure, means with different letters differ significantly (Fisher’s protected LSD, α = 0.05).