Significant contaminant species with a decreasing presence trend in perennial ryegrass and white clover seed lots. Contaminants are listed in alphabetical order.

 
 
  Part of: Rubenstein JM, Hulme PE, Rolston MP, Stewart AV, Hampton JG (2023) A century of weed change in New Zealand’s forage seed multiplication industry. NeoBiota 85: 167-195. https://doi.org/10.3897/neobiota.85.100825