Evaluation of Meloidogyne incognita and Rotylenchulus reniformis nematode-resistant cotton cultivars with supplemental Corteva Agriscience nematicides

• Published in: Journal of nematology Vol. 55; no. 1; pp. 20230001 - 289
• Main Authors: Kate Turner, A., Graham, Scott H., Potnis, Neha, Brown, Steve M., Donald, Pat, Lawrence, Kathy S.
• Format: Journal Article
• Language: English
• Published: Poland Sciendo 17.02.2023
• Subjects: Burkholderia; cotton; cultivars; fermentation; heat; integrated nematode management; lint cotton; lint yield; meloidogyne; Meloidogyne incognita; nematicides; nematology; oxamyl; reniform nematode; Research Paper; root-knot nematode; rotylenchulus; Rotylenchulus reniformis; seed treatment; integrated nematode management; cotton; Rotylenchulus; root-knot nematode; Meloidogyne; reniform nematode
• ISSN: 2640-396X; 0022-300X; 2640-396X
• DOI: 10.2478/jofnem-2023-0001

- and -resistant new cotton cultivars have recently become available, giving growers a new option in nematode management. The objectives of this study were: (i) to determine the yield potential of the new cultivars PHY 360 W3FE ( -resistant) and PHY 332 W3FE ( -resistant) in nematode-infested fields and (ii) to evaluate the effects of combining the nematicides Reklemel (fluazaindolizine), Vydate C-LV (oxamyl), and the seed treatment BIO Nematicide 100 (heat killed and its non-living spent fermentation media) with resistant cotton cultivars on nematode population levels and lint yield. Field experiments in 2020 and 2021 indicated population levels were 73% lower on PHY 360 W3FE (R) and 80% lower for on the PHY 332 W3FE (R) at 40 days after planting. Nematode eggs per gram of root were further reduced an average of 86% after the addition of Reklemel and Vydate C-LV when averaging both cultivars over the two years. Tests with BIO Nematicide 100 + Reklemel + Vydate C-LV (0.56 + 2.5 L/ha) in both and fields produced higher lint yields. Overall, planting PHY 360 W3FE (R) and PHY 332 W3FE (R) improved yields an average of 364 kg/ha while limiting nematode population increases. The addition of the nematicides further increased yields 152 kg/ha of the nematode-resistant cultivars.