Flixweed is at the very early stages of appearance in Wisconsin. Canada thistle has become much more abundant in recent years. We used to see milkweed as an occasional plant in fields but recently whole fields with sizable infestations have surfaced. Leafy spurge has been a roadside plant in Wisconsin for many years. Now it has moved across the fence and has invaded pasture land.
Dandelion is most evident in older hay fields.
The more frequent cutting, higher rates of potassium, and absence of a forage grass contribute to its increased abundance in no-till soybeans. Few herbicides are used in established forages. Thus if weeds appear, they often go to seed and this increases future weed pressure. This probably accounts for the increase in blackseeded plantain. It was formerly a headland phenomenon.