YAKIMA, Wash. – The Washington State Department of Agriculture (WSDA) confirmed the first North American detection of sunflower broomrape in Yakima. This invasive parasitic weed poses a significant threat to sunflower crops.
A homeowner discovered the plant, and confirmation came from the WSDA State Plant Pathology and Molecular Diagnostic Lab alongside the USDA Animal and Plant Health Inspection Service (APHIS). They used both morphological and molecular analysis to confirm the detection.
Sunflower broomrape is a root parasite affecting sunflowers and others in the sunflower family. It relies entirely on host plants for nutrients and is incapable of photosynthesis.
WSDA said the aggressive nature of this weed and its possibility for rapid spread is concerning. It threatens commercial sunflower production and could negatively impact growers, processors, exporters and the agricultural economy.
The public is urged to report suspected sightings of sunflower broomrape. WSDA advises not to disturb the plant to prevent seed spread. One plant can produce hundreds of thousands of microscopic seeds that remain viable in the soil for decades. Instead, photograph it and report to WSDA.
Reports can be made by emailing pest@agr.wa.gov or calling 1-800-443-6684 (option 1). Include the reporting party’s name, location, date encountered and photos.
WSDA will continue coordinating with USDA APHIS and stakeholders to implement mitigation strategies. Public outreach and grower engagement are part of the response plan.
NonStop Local reached out to the WSDA for an interview, but they were unable to meet.
