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Organic Farmer Training Program: Reference Materials

Spring 2019

Online materials

Reference materials

Studies / Surveys / Data sets

Common and Troublesome Weeds Surveys. Weed Science Society of America.
Survey results for the most common and troublesome weeds in the U.S. and Canada. Summaries and dataset downloads are available for the following:

  • 2025 - forthcoming.
  • Van Wychen L (2024) 2024 Survey of the Most Common and Troublesome Weeds in Aquatic and Non-Crop Areas in the United States and Canada. Weed Science Society of America National Weed Survey Dataset.
  • Van Wychen L (2023) 2023 Survey of the Most Common and Troublesome Weeds in Grass Crops, Pasture & Turf in the United States and Canada. Weed Science Society of America National Weed Survey Dataset.
  • 2023 Baseline Survey of the Most Common and Troublesome Weeds in Hemp [Survey data only - no summary]
  • Van Wychen L (2022) 2022  Survey of the most common and troublesome weeds in broadleaf crops, fruits & vegetables in the United States and Canada. Weed Science Society of America National Weed Survey Dataset.
  • Van Wychen L (2021) 2021 Survey of the Most Common and Troublesome Weeds in Aquatic and Non-Crop Areas in the United States and Canada. Weed Science Society of America National Weed Survey Dataset.
  • Van Wychen L (2020) 2020 Survey of the Most Common and Troublesome Weeds in Grass Crops, Pasture & Turf in the United States and Canada. Weed Science Society of America National Weed Survey Dataset.
  • Van Wychen L (2019) 2019 Survey of the Most Common and Troublesome Weeds in Broadleaf Crops, Fruits & Vegetables in the United States and Canada. Weed Science Society of America National Weed Survey Dataset.
  • Van Wychen L (2018) 2018 Survey of the Most Common and Troublesome Weeds in Aquatic and Non-Crop Areas in the United States and Canada. Weed Science Society of America National Weed Survey Dataset.
  • Van Wychen L (2017) 2017 Survey of the Most Common and Troublesome Weeds in Grass Crops, Pasture and Turf in the United States and Canada. Weed Science Society of America National Weed Survey Dataset.
  • Van Wychen L (2016) 2016 Survey of the Most Common and Troublesome Weeds in Broadleaf Crops, Fruits & Vegetables in the United States and Canada. Weed Science Society of America National Weed Survey Dataset.
  • Van Wychen L (2016) 2015 Baseline Survey of the Most Common and Troublesome Weeds in the United States and Canada. Weed Science Society of America National Weed Survey Dataset.