What is adventitious presence?
Adventitious presence is the presence of small amounts of genetic material or whole seeds from another variety, crop or weed in a seed or grain shipment. Virtually all seed and commercial grain shipments contain some adventitious material even though seed companies, farmers and the grain trade take many steps to minimize it. Recognizing its inevitability, national and international regulation of the seed and grain industries has taken adventitious presence into account for years by establishing thresholds for purity levels in seed shipments and that are slightly less than 100%.
