Effect of Varieties with Reniform Nematode Resistance on Yield and Nematode Density in Field Trials in the Southern High Plains of Texas

Small-plot replicated variety trials were conducted in a field naturally infested with the reniform nematode from 2021 to 2025. The objectives were to determine if resistant varieties yielded better than susceptible varieties; compare fiber properties of various resistant varieties; and determine reniform nematode density differences between resistant and susceptible varieties. From 2021 to 2025, resistant varieties averaged 76% higher lint yield than susceptible varieties (983 vs. 559 kg of lint/ha); 77% higher value (lint yield x loan value was $1,184/ha vs. $670/ha); and 59% lower nematode density (241 vs. 595 vermiform reniform nematodes/500 cm3 soil). The highest yielding varieties were PHY 332 W3FE and PHY 205 W3FE in 2021; PHY 411 W3FE in 2022 and 2023; PHY 357 W3FE, PHY 433 W3FE, PHY 443 W3FE, PHY 332 W3FE, and ST 5931AXTP in 2024; and PHY 475 W3FE, PHY 332 W3FE, DP 2522NR B3TXF, PHY 411 W3FE, and PHY 357 W3FE in 2025. The best fiber length among the resistant varieties were associated with PHY 332 W3FE in 2021 and 2023, DP 2143NR B3XF in 2022 and 2023, and PHY 433 W3FE in 2024 and 2025. The strongest fiber within resistant varieties were associated with PHY 443 W3FE in 2021, DP 2143NR B3XF in 2022 and 2024, PHY 332 W3FE in 2023, and PHY 433 W3FE in 2025.