Weeds do not affect wheat yields as much as they affect corn and soys. Short weeds such as chickweed and field violet have little effect on wheat yields. But they may cause other problems.
If you leave chickweed to grow it causes problems in next year’s corn or beans. This early growing weed is a good food source for wireworms. Wireworms will affect the bean or corn crop if not controlled. Chickweed does interfere with corn planting. Tillage just moves the root balls around resulting in poorer seed-to-soil contact.
Other weeds that may not affect wheat yield include ragweed and lambs quarters. If these weeds are allowed to grow they will put weed seed into the soil to harm you later. These weeds are hard to control in beans. You do not want to add more seeds of these to weeds to the soil.
Some weeds interfere with harvest. The weeds may not be through the whole field but are scattered enough to cause harvest delays while you wait for them to dry down.
Since early wheat competition will not affect wheat yields as much as early weeds affect corn and soys there is no big rush to control weeds. Pick a nice day. Herbicides control weeds better if the weeds are actively growing. Wheat plants can break down herbicides easier if the wheat is actively growing. Each year we see some fields that have been affected because herbicides were applied under less than ideal growing conditions. BF