Source: Mark Loux, Ohio State University
Mark Loux, Ohio State University, offers several tips regarding marestail biology, resistance and control as it relates to spring burndown/residual herbicide applications.
- The majority of the marestail populations in Ohio are resistant to glyphosate or ALS inhibitors (FirstRate, Classic, Synchrony, Canopy EX, etc) or both types of herbicides.
- Comprehensive burndown programs that are usually effective on marestail include combinations of herbicides.
- Options for control of large marestail (10 to 20 inches), include a high rate of Ignite (32 to 36 oz) in combination with metribuzin.
- Marestail is capable of emerging throughout much of the year, and substantial emergence can occur between now and mid June.
- We have had good success with April applications of a combination of burndown and residual herbicides, so we suggest applying anytime from now on that the field is fit for traffic.
- What if I applied herbicides last fall? This does not necessarily change the recommendations presented previously in this article.