By Aaron Becerra-Alvarez
Vegetable specialty seed production is a cornerstone of agriculture in the Pacific Northwest. More than 170 seed crops — including brassicas, spinach, radish, carrot, onion and many others — are grown on relatively small acreages but generate high farm-gate value and supply global markets.
In response, Aaron Becerra-Alvarez, an assistant professor in the Oregon State University College of Agricultural Sciences and Extension specialist in weed science in vegetables and specialty seed crops, surveyed specialty seed practitioners across key production regions in Oregon and Washington to identify priority weed management challenges and research needs.
Respondents included growers, crop advisors, seed industry representatives and researchers, many with decades of experience in specialty seed systems. The survey asked which crops and weeds pose the greatest challenges, which management tools are most relied on, and what types of research and new solutions the industry needs next.
The survey results pointed to consistent pressure points. Practitioners most often named brassica seed crops, spinach and radish as the crops with the greatest weed management challenges.
They most frequently identified shepherd’s purse and other weedy Brassicaceae species as top problem weeds — a concern amplified by the close relationship between these weeds and key seed crops, which can limit effective control options and host plant diseases.
Respondents reported that herbicides remain the primary weed management tool, and more than 90% prioritized herbicide research. At the same time, many flagged herbicide crop injury as a significant challenge, underscoring the need for research that improves efficacy while reducing injury risk, including the potential for herbicide carryover in diverse rotations.
Findings point to research and regulatory needs
Respondents also expressed strong interest in nonchemical approaches, but they emphasized that the region lacks applied research on how cultural practices such as rotations and cover crops affect weeds in seed systems.
They also noted the need for independent evaluation of emerging technologies — such as precision cultivation and other “smart” tools — to determine whether they are effective and economical across the wide range of seed crops grown in the Pacific Northwest.
By documenting weed management priorities directly from practitioners, the study provides a roadmap for action that agencies, industry partners and research programs can use to accelerate practical solutions.
Source : oregonstate.edu