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Northern Illinois Agriculture

University of Illinois Extension
Early season weeds

Early season weeds

Posted by Russel Higgins - Weeds

For some who have been unable to till or burndown fields, the first flush of weeds are well established. Joining the winter annuals including Henbit, Chickweed, and Horseweed (Marestail) are the early emerging summer annuals including Lambsquarters and Giant ragweed.
If you are interested in what weeds will germinate next, download the Weed Emergence Sequence document.

Today I was invited to a  field in Will County that suffered substantial weed issues when planted to soybean in 2013. The abundance of weed seedlings present suggested numerous weeds were allowed to set viable seed in previous years. Correcting this problem will likely not happen in a year, but a weed management plan has been put in place that should increase the productivity of the field as it addresses weed control.

This includes
  • identification of the problematic weed species and understanding their growth cycle and biology. In this case; Horseweed, Giant ragweed and Lambsquarter.
  • Planting into a weed free field in 2014.
  • Utilizing a soil residual as part of a two pass (minimum) herbicide program.
  • Utilizing herbicides with multiple modes of action, being aware that one of the species (Horseweed) may be a glyphosate resistant population.
  • Scouting
  • If practical, implementing a fall herbicide application.
For most Illinois producers the time, management, and in some cases, resources, dedicated to weed control will increase in 2014. Our short time that we were dependent upon glyphosate and post applications alone appear to be a thing of the past.

Planting has resumed in northern Illinois, while digging behind the planter I continue to be surprised at how cold the soil is to the touch. The May 4th minimum soil temperature measured at 4 inches under bare soil at the NIARC was 49.2 degrees.

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