Optimizing Electrical and Mechanical Palmer Amaranth Control and Reducing Seed Production and Viability

View the project final report

Commodities

• Agronomic: peanuts
• Vegetables: cucurbits, sweet potatoes

Practices

• Pest Management: physical control

Palmer amaranth (Amaranthus palmeri) is the most troublesome weed in U.S. crops. In an effort to reduce herbicide use, tillage and labor costs to control Palmer amaranth, commercially available electrical and mechanical control methods will be evaluated to optimize use efficiency. Electrical and mechanical weed control eliminate weeds that are taller in height than the crop canopy. Mechanical and electrical weed control has the potential to reduce the amount of between-row cultivation, herbicide application, and hand labor needed to achieve weed control, as well as the ability to selectively manage weeds that extend above the crop canopy to preserve the biodiversity of other small non-weedy plants that can support a high diversity of insect species. Additionally, it is hypothesized that seed production and viability can be reduced from electric treatments to sexually mature plants. Sweet potato, peanut, and cucumber are economically important crops in North Carolina that each are easily outcompeted for light by Palmer amaranth, which can grow to 2 m tall. Therefore, studies were conducted in each crop to optimize the use efficiency of each method of control. Another study was conducted to evaluate the effect that electrical applications have on Palmer amaranth pre-dispersal seed viability.  An economic analysis evaluated each control method and the results will be disseminated to growers and the scientific community.  We are still working on creating an extension publication to provide results to growers and extension agents.  

• Develop recommendations needed for electric weed control and mechanical weed removal to optimize crop yield and quality.
• Develop a management program to reduce weed seed number and viability of seeds added to the soil seed bank.
• Assess the cost to benefit economics for using the electric method of weed control and mechanical weed puller and disseminate research-based knowledge and recommendations through grower meetings, technical extension articles, and refereed journal publications.