|Power on! Low Energy Electro-Physical Treatment Is an Effective New Weed Control Approach.|
Lati RN, Rosenfeld L, David IB, Bechar A.
Pest management science. 2021; ():
BACKGROUND: Environmental issues call for adoption of alternative non-chemical weeding approaches. This study aimed to develop and evaluate a novel, precise, low-energy electro-physical treatment weeding systems and to provide new insight into their control mechanism. Two electro-physical treatment systems, based on AC (2.2 kV) and DC (40 kV) energy sources, were developed and evaluated. The impact of various operational and biological factors on the weed control effectiveness was evaluated. Additionally, thermal images were taken during the treatments to document plant temperature. RESULTS: Treatments via direct leaf contact caused greater damage to Amaranth plants than the stem contact treatments, with 75% and 20% biomass reduction compared to control, respectively. Early growth stages was favorable over later-stage with 100% and 75% biomass reduction for Trifolium pretense plants treated with 0.0125 W h two and four weeks after seeding, respectively, compared to control. Additionally, the applied energy affected treatment performance, with its impact varying across the growth stages and species. At two-leaf growth stage, 0.0025 W h treatment was sufficient for plant death. A >40 degrees C increase in plant temperature was measured during the electro-physical treatment, with the temperature of some plants organs reaching ~70 degrees C. CONCLUSION: Results from this study demonstrate the potential use of electro-physical treatment as an effective weed control tool. The low energetic demands in the new systems provide suitable control results when applied at early stages. Temperature increase seemed to be one of the main control factors, yet, efficacy was affected by various biological factors. This article is protected by copyright. All rights reserved. CI - This article is protected by copyright. All rights reserved.