Effects of Fusarium wilt on Cotton Cultivars with and Without Meloidogyne incognita Resistance in Fields

• Published in: Journal of nematology 2022-07, Vol.54 (1), p.20220017-20220017
• Main Authors: Wheeler, Terry A., Dotray, Jessica, Monclova-Santana, Cecilia
• Format: Article
• Language: English
• Subjects: cotton; f. sp; fusarium oxysporum f. sp. vasinfectum; Fusarium wilt; gossypium hirsutum; management; meloidogyne incognita; Research Paper; resistance
• ISSN: 2640-396X; 0022-300X; 2640-396X
• DOI: 10.2478/jofnem-2022-0017

Cotton ( ) cultivar trials were conducted in four fields (6 trials total) with (Mi)/ f. sp. (Fov) from 2019 to 2021. Cotton cultivars were divided into groups based on company/Mi resistance: S = susceptible to Mi; R-FM, R-DP, and R-PHY = resistance to Mi in FiberMax®, Deltapine®, and Phytogen® cultivars, respectively; ST 4946GLB2 (moderate resistance to Mi and observed field tolerance to Fov); and ST 5600B2XF (resistance to Mi). The S and R-FM groups had the highest transformed Mi densities LOG (Mi + 1) (LMi = 3.22 and 3.01, respectively), while R-DP and R-PHY had the lowest LMi (2.21 and 1.85, respectively). Plant mortality (%) was higher for R-DP (28.1%) than for all other groups except ST 5600B2XF (24.8%). Mi-susceptible cultivars averaged 23.3% mortality. Relative yield (0-1 scale) was higher for ST 4946GLB2 (0.706) and R-PHY (0.635) than for R-DP (0.530), ST 5600B2XF (0.578), and S (0.491). All groups except R-DP averaged higher relative yield than the susceptible cultivars. ST 4946GLB2 had the lowest mortality (16.5%) and highest relative yield, while R-DP cultivars had the highest mortality and no difference in relative yield from the Mi-susceptible cultivars. The group of R-DP cultivars had excellent Mi resistance but were susceptible to Fov. No cultivars were identified with high resistance to Fov.