Big Corn and Big Weeds
Other Publications Available
|Is That A Giant Dandelion?|
|Musk Thistle and Its Control|
|Weather Related Weed Management Items|
|Methods to Control Volunteer Roundup Ready or Glyphosate-Tolerant Corn in a Corn Replant Situation|
|Glyphosate and Foliar Fertilizer|
We have been flooded with calls on how to control big weeds in big corn. The recent wet spell has kept sprayers out of the field and many farmers have reduced their reliance on preemergence residual herbicides in corn production in favor of reliance on glyphosate postemergence. This year is a perfect example of why we should not rely totally on postemergence weed management strategies in corn. We have likely given up thousands of bushels of yield potential across the state because we were not able to protect crop yields from weed competition. Anyway, most of you know our stance on the value of residual herbicides and you probably expected this sermon.
What can you do? About a month ago we posted an article that showed the crop growth stage restrictions for postemergence herbicides in corn. Here is another chance to look at this table and see what your options are. Also, keep in mind the weed control efficacy table so you know what herbicides control specific weeds. Also, be realistic and if you have weeds over 1 foot tall, do not expect complete control. All you can really hope for is suppression and lessening the impact on final yield.
|Table 2. Weed Response to Postemergence Herbicides in corn. [PDF]|