There have been a few reports of disappointing burndown applications that were applied near that huge week of rain. The herbicides that performed poorly were some combination of systemic herbicides like glyphosate, dicamba, clethodim and Leadoff.

In hindsight, it is not surprising those herbicides did not perform well as waterlogged, stressed weeds typically respond poorly to systemic herbicides. On the other hand, it is notable that there were no reports of poor burndown performance with Gramoxone, Reviton and Verdict. Those contact herbicides are not as prone to being impacted by environmental stressors as systemic herbicides. This is something to remember for the 2026 burndown season.

Generally speaking, systemic herbicides do not typically work well on weeds that escaped early herbicide applications. The contact herbicides mentioned above would be the best candidates to burndown those escaped winter annual weeds.

One final note is the new PPO-inhibiting herbicide, Reviton, mixed with glyphosate has done a good job burning down many winter annual weeds like henbit and poa. Unfortunately, it is weak on horseweed. This is notable as horseweed is more of a problem this spring then it has been in over a decade. This was very apparent in grower fields as well as our research this year. Tank mix 8 ozs of dicamba in with the Reviton and glyphosate to pick up horseweed.