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BACKGROUND: Herbicides are the primary weed management method for processing vegetable growers, but challenges such as limited chemical options, herbicide resistance, crop injury risks, regulatory changes, and shifting consumer preferences are driving interest in nonchemical alternatives like laser weeding. In 2024, three research trials in New Jersey and New York evaluated the effectiveness of laser weeding using a commercial unit and comparing it with pre-emergence- and postemergence-applied herbicides on beet (Beta vulgaris L.), spinach (Spinacia oleracea L.), and pea (Pisum sativum L.). RESULTS: Across all trials, laser weeding was as effective as or superior to S-metolachlor, bentazon and phenmedipham herbicides applied at label rate in controlling erect annual weeds, including common lambsquarters (Chenopodium album L.) and common ragweed (Ambrosia artemisiifolia L.). However, laser weeding was less effective on purslane (Portulaca oleracea L.) and annual grasses in New York because of sequential emergence patterns and protected meristems, respectively. Compared with untreated controls, laser weeding reduced weed cover by ≥45% and density by ≥66%, resulting in ≥97% less weed biomass by the season's end. In addition, crop stunting did not exceed 1% and crop biomass increased by ≥30% when laser weeding replaced herbicide applications. CONCLUSIONS: These findings demonstrate that multiple laser passes can control weeds without damaging crops, leading to higher yields than conventional herbicides. Further research is needed to optimize laser weeding across different environments and weed species, and to evaluate commercial units with increased laser capacity and faster processing speeds. © 2025 The Author(s). Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
Sosnoskie et al. (Tue,) studied this question.