Poa annua becomes the first weed to evolve resistance to indaziflam applied preemergence and early-postemergence.

ABSTRACT:

Background

Herbicide resistance evolution is a major challenge in agriculture. Poa annua L., a globally distributed and genetically diverse weed, has repeatedly evolved resistance to multiple herbicide sites of action due to its genetic plasticity and rapid life cycle. Indaziflam is widely used for P. annua control in several agroecosystems, with reports of postemergence resistance and a few confirmed cases of resistance to preemergence application. This study investigated suspected resistance to indaziflam in P. annua accessions from Oregon hazelnut orchards.

Results

Whole-plant dose-response assays confirmed indaziflam resistance in eight accessions ranging from 2.5- to 51-fold relative to susceptible accessions, which had a lethal dose to 50% of the accession (LD_50</

SUBMITTER: Miranda JW 

PROVIDER: S-EPMC12713700 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature