HPPD-inhibitor Resistance

Since 2009, waterhemp (Amaranthus tuberculatus) and Palmer amaranth (Amaranthus palmeri) have been identified with resistance to hydroxyphenylpyruvate dioxygenase (HPPD)-inhibitor chemistries used in several agronomic production systems in North America.

HPPD-inhibitors can be found in multiple products and have become valuable tools for managing weeds resistant to other herbicides. The objectives of the HPPD-inhibitor Working Group are to develop stewardship recommendations and implement key actions to support the use of HPPD-inhibitors with the intent of prolonging their efficacy in providing weed control solutions for agricultural producers. The objectives will be accomplished by understanding the current resistance situation and providing communication and education tools, consistent stewardship recommendations to stakeholders, and guidance on potential research objectives.

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