Nematicide impact assessment on soil health in cotton production systems

Overview

This research addresses a critical question in agricultural sustainability: how do modern non-fumigant nematicides affect soil health and the natural ability of soils to suppress nematode invasion in cotton production? The project focuses on Louisiana cotton systems, where the Southern root-knot nematode (Meloidogyne incognita) and reniform nematode (Rotylenchulus reniformis) cause significant yield losses. By evaluating multiple nematicide treatments alongside untreated controls, the research aims to determine whether newer nematicide products preserve soil suppressiveness compared to traditional fumigants, supporting more sustainable pest management decisions for cotton growers.

Technical specifications

Research approach:

• Two field trials will be conducted at LSU AgCenter research stations with histories of root-knot and reniform nematode pressure: Northeast Research Station (St. Joseph, LA) and Macon Ridge Research Station (Winnsboro, LA)
• Small-plot trials arranged in a randomized complete block design
• Soil treatments evaluated: untreated control, Acceleron INT-710 (seedcoat), Velum Total (18 fl oz/A), AgLogic 15G (5 lb/A), and Vydate C-LV (17 fl oz/A)
• Soil suppressiveness assessed at three timepoints: prior to treatment, one month after planting, and at harvest
• Nematode density and yield data collected throughout the growing season
• Builds on prior Florida strawberry and Louisiana sweetpotato field work demonstrating nematicide efficacy and soil health preservation

Technology readiness level

This is an applied field research project at an early-to-mid stage of validation. Preliminary work in Florida strawberry systems and Louisiana sweetpotato production has demonstrated promising results with Velum Prime preserving soil suppressiveness relative to fumigants. The spring 2022 cotton field trials represent the next phase of validation in a new crop system. The research team has established field sites, defined treatment protocols, and identified appropriate assessment methods. Findings will inform best management practices for nematicide use in cotton production and contribute to understanding the tradeoffs between pest control efficacy and long-term soil health preservation.