Living mulches for integrated weed management in herbicide-resistant cropping systems
A novel integrated weed management (IWM) approach using living mulches planted between cash crop rows to suppress herbicide-resistant weeds. Field-validated species including cowpeas, forage peanuts, buckwheat, and Japanese millet demonstrate strong weed suppression through shading, competition, and allelopathy, offering a sustainable alternative that complements herbicide programs and supports soil and water conservation.
Overview
This solution introduces living mulches as a novel integrated weed management (IWM) tool for controlling herbicide-resistant weeds in row crop systems. By planting living mulch species between rows of established cash crops such as cotton, growers can inhibit weed seed germination and suppress weed seedling establishment and growth through multiple mechanisms including shading, competition for aboveground and belowground resources, and allelopathy. The approach reduces reliance on herbicides, helps manage resistant weed populations, and contributes to soil and water conservation while protecting natural habitats in and around agricultural fields.
Technical specifications
Core approach:
- Living mulch species are planted between rows of established cash crops at 2 or 4 weeks after crop planting
- Selected species are short-lived and naturally suppressed by the cash crop canopy before reaching reproductive maturity
- Multiple suppression mechanisms work simultaneously: shading, resource competition, and allelopathy
Top-performing species identified in field trials:
- Cowpeas
- Forage peanuts (spreading)
- Buckwheat
- Japanese millet
These species grew close to the ground and were effectively terminated by the cotton canopy. Planting at 2 weeks after cotton planting was identified as the optimal timing for weed suppression performance.
Experimental design:
- Replicated split-plot field experiment conducted at Texas A&M University during summer 2021
- 20 living mulch species evaluated in cotton
- Treatment factors included living mulch species and planting timing
Technology readiness level
The living mulch IWM concept has been validated through replicated field trials in cotton at Texas A&M University, with promising species and planting timings identified. The solution is at an early-to-mid stage of agricultural technology readiness. Further validation is needed to evaluate the selected species across multiple environments and years, and to assess their compatibility with commonly used preemergence herbicides in cotton. Planned next steps include a randomized complete block field experiment testing 10 commonly used cotton preemergence herbicides, with measurements of living mulch establishment, growth, weed suppression, biomass production, and cotton growth and yield. Long-term evaluation of competitive interactions across multiple sites and seasons is also required before broad commercial adoption.
About Texas A&M University, Corpus Christi
Texas A&M University–Corpus Christi is a comprehensive public research university on Ward Island, pairing applied research with workforce development for the Gulf Coast. Industry collaboration is enabled by the Autonomy Research Institute—home to Texas’s FAA-designated UAS test site—offering operational air, land, and maritime environments for flight testing and integration. Co-located with the Harte Research Institute for Gulf of Mexico Studies, the university provides coastal labs and decision-support expertise for activities across the Gulf. A Coastal Bend Business Innovation Center and a dedicated technology transfer office help companies co-develop prototypes, navigate IP, and launch ventures. Research is supported by competitive federal and state funding, including awards from the National Science Foundation, alongside partnerships with regional enterprises anchored by the Port of Corpus Christi.
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