Table 1.
Cultivars1 grouped into Meloidogyne incognita (Mi) resistance categories2 for analysis.
| Cultivar | Mi categoryb | Trials | Years |
|---|---|---|---|
| DP 1454NR B2RF | NR | 2 | 2016 |
| DP 1558NR B2RF | NR | 9 | 2016 to 2017 |
| DP 1747NR B2XF | NR | 11 | 2016 to 2019 |
| DP 1823NR B2XF | NR | 3 | 2018 to 2019 |
| FM 1621GL | PR | 3 | 2018 to 2019 |
| FM 1911GLT | PR | 12 | 2016 to 2019 |
| FM 2011GT | PR | 8 | 2016 to 2018 |
| PHY 250 W3FE | PR | 1 | 2019 |
| PHY 320 W3FE | PR | 4 | 2018 to 2019 |
| PHY 350 W3FE | PR | 2 | 2018 |
| PHY 400 W3FE | PR | 4 | 2018 to 2019 |
| PHY 417 WRF | HR | 8 | 2016, 2017 |
| PHY 430 W3FE | PR | 1 | 2018 |
| PHY 440 W3FE | PR | 3 | 2018 |
| PHY 480 W3FE | HR | 6 | 2017 to 2019 |
| PHY 500 W3FE | HR | 2 | 2019 |
| PHY 580 W3FE | HR | 2 | 2019 |
| ST 4946GLB2 | PR | 13 | 2016 to 2019 |
1 Notes: 1Susceptible cultivars included in these trials are listed and the number of trials in (): Croplan Genetics (CP) ‘CP 3475 B2XF’ (1), ‘CP 3885 B2XF’ (1), ‘CP 9178 B3XF’ (2); ‘CP 9598 B3XF’ (1), ‘CP 9608 B3XF’ (1); Deltapine (DP) ‘DP 1522 B2XF’ (6), ‘DP 1612 B2XF’ (1), ‘DP 1646 B2XF’ (3), ‘DP 1820 B3XF’ (3), ‘DP 1822 XF’ (3), ‘DP 1840 B3XF’ (2), ‘DP 1845 B3XF’ (1), ‘DP 1851 B3XF’ (1), ‘DP 1908 B3XF’ (1), ‘DP 1909 XF’ (2), ‘DP 1916 B3XF’ (1), ‘DP 1948 B3XF’ (1); Fibermax (FM) ‘FM 1320 GL’ (1), ‘FM 1888 GL’ (2), ‘FM 1953 GLTP’ (1), ‘FM 2322 GL’ (1), ‘FM 2398 GLTP’ (4), ‘FM 2498 GLT’ (4), ‘FM 2574 GLT’ (4); NexGen (NG) ‘NG 2982 B3XF’ (1), ‘NG 3406 B2XF’ (7), ‘NG 3500 XF’ (4), ‘NG 3640 XF’ (2), ‘NG 3699 B3XF’ (1), ‘NG 3930 B3XF’ (1), ‘NG 3956 B3XF’ (1), ‘NG 3994 B3XF’ (1), ‘NG 4545 B2XF’ (3), ‘NG 4689 B2XF’ (4), ‘NG 4777 B2XF’ (2), ‘NG 4936 B3XF’ (2); PhytoGen (PHY) ‘PHY 210 W3FE’ (1), ‘PHY 300 W3FE’ (1), ‘PHY 330 W3FE’ (1), ‘PHY 333 WRF’ (1), ‘PHY 340 W3FE’ (1), ‘PHY 450 W3FE (1)’, ‘PHY 490 W3FE (2)’, ‘PHY 499 WRF’ (7); and Stoneville (ST) ‘ST 4550 GLTP’ (3), ‘ST 5020 GLT’ (1), ‘ST 5122 GLT’ (1), ‘ST 5471 GLTP’ (1), ‘ST 5707 B2XF’ (2). 2HR-PHY are PhytoGen cultivars that have two-gene homozygous M. incognita resistance; PR-PHY are PhytoGen cultivars with partial resistance to M. incognita; NR-DP are Deltapine cultivars with M. incognita resistance; PR-FM/ST are Fibermax and Stoneville cultivars with partial resistance to M. incognita.
Table 2.
Least square means1 of nematode resistance groups for lint yield, Meloidogyne incognita eggs and second-stage juveniles (J2).
| Analysis for full data set | Omitting data for older cultivars4 | |||||||
|---|---|---|---|---|---|---|---|---|
| R group2 | Lint yield (kg/ha) | Eggs/500 cm3 soil | LE3 | J2/200 cm3 soil | Lint yield (kg/ha) | Eggs/500 cm3 soil | LE | J2/200 cm3 soil |
| HR-PHY | 1,327 ab2 | 154 | 1.5 d | 27 b | 1,460 a | 340 | 1.4 d | 27 b |
| PR-PHY | 1,314 ab | 2,071 | 2.1 c | 59 b | 1,330 ab | 2,193 | 2.1 c | 32 b |
| NR-DP | 1,234 b | 1,456 | 2.4 bc | 76 b | 1,227 b | 1,880 | 2.4 bc | 37 b |
| PR-FM/ST | 1,396 a | 3,310 | 2.7 b | 146 b | 1,396 a | 3,283 | 2.6 b | 73 b |
| None | 1,243 b | 7,871 | 3.3 a | 336 a | 1,244 b | 7,867 | 3.2 a | 168 a |
1 Notes: 1Least square means followed by the same letters are not significantly different at p = 0.05, based on a mixed model analysis and t-test (pairwise mean) comparisons. 2HR-PHY are PhytoGen cultivars that have two-gene homozygous M. incognita resistance; PR-PHY are PhytoGen cultivars with partial resistance to M. incognita; NR-DP are Deltapine cultivars with M. incognita resistance; PR-FM/ST are Fibermax and Stoneville cultivars with partial resistance to M. incognita. 3LE = LOG10(M. incognita eggs/500 cm3 soil +1). 4The cultivars DP 1454NRB2RF, DP 1558NRB2RF, and PHY 417WRF were omitted from the analyses.