Abstract
Plant-parasitic nematodes (Rotylenchulus reniformis (reniform, RN), Helicotylenchus dihystera (spiral), and Mesocriconema ornatum (ring)) and yield were investigated in cotton phases of conventional (peanut–cotton–cotton) and sod-based (bahiagrass–bahiagrass–peanut–cotton) rotations with or without irrigation and fluopyram nematicide at a long-term research site, established in 2000, in Quincy, Florida, USA. Objectives were to determine impacts of nematicide application on cotton yield and evaluate effects of nematicide on plant-parasitic nematodes in these rotations in 2017 and 2018. Reniform nematode population densities were greater in conventional cotton than sod-based cotton. Ring and spiral nematode population densities were greater in sod-based cotton than conventional cotton. Plots receiving nematicide had increased RN population densities in preplant 2018 soil samples and spiral nematode population densities in preplant 2017, harvest 2017, preplant 2018, and harvest 2018 soil samples compared to untreated plots. Cotton seed yield in conventional rotation was increased by 18% following nematicide application in 2017 but decreased by 10% in sod-based rotation in 2018, relative to the untreated control. Sod-based rotation had greater cotton yield than conventional rotation in 2017 and 2018. Nematicide application did not improve cotton yield in sod-based rotation and was inconsistent in conventional rotation.
Highlights
Cotton, Crop rotation, Fluopyram, Helicotylenchus, Management, Mesocriconema, Nematicide, Plant-parasitic nematodes, Reniform nematode, Ring, Rotylenchulus reniformis, Spiral
Reniform nematode (Rotylenchulus reniformis Linford and Oliveira, RN) is a significant pathogen of cotton that is typically managed by crop rotation or nematicide application (Linford and Oliveira, 1940; Moore and Lawrence, 2012)
Irrigation effects were significant in C1 and C2 for harvest 2017 soil samples, where total RN population density was greater in rainfed plots of C1 (6,151 RN/100 cm3 soil) and significantly lower in irrigated plots (3,513 RN/100 cm3 soil) while total RN population density was greater in irrigated plots of C2 (6,269 RN/100 cm3 soil) and significantly lower in rainfed plots (4,355 RN/100 cm3 soil)
Summary
Crop rotation, Fluopyram, Helicotylenchus, Management, Mesocriconema, Nematicide, Plant-parasitic nematodes, Reniform nematode, Ring, Rotylenchulus reniformis, Spiral. Reniform nematode (Rotylenchulus reniformis Linford and Oliveira, RN) is a significant pathogen of cotton that is typically managed by crop rotation or nematicide application (Linford and Oliveira, 1940; Moore and Lawrence, 2012). Prior research suggests SBR may be beneficial for managing RN during peanut phases, but SBR impacts on RN during cotton phases have not been examined (Tsigbey et al, 2009) Nematicide application is another primary method to manage plant-parasitic nematodes in cotton (Moore and Lawrence, 2012; Khanal et al, 2018). While effective in managing Meloidogyne spp. on vegetables in greenhouse and microplot studies (Hajihassani et al, 2019; Silva et al, 2019), evaluation of fluopyram effects on other plant-parasitic nematodes is needed in various rotation systems
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