Source: Bob Hartzler, Iowa State University
This winter's record snow cover is likely to contribute to abundant winter annual weed infestations in no-till fields. In most years, winter annual infestations suffer significant mortality due to low temperatures and freeze/thaw cycles, but the snow provided a blanket of protection. Thus, winter annual infestations will likely be more abundant and vigorous than in typical years.
As a result, now is the time to scout fields to determine the need for herbicide applications specifically targeting winter annuals. The criteria used to determine if winter annuals warrant treatment is "fuzzy" at best, but without scouting fields, the likelihood of efficiently managing these weeds is low.