Evolution of herbicide-resistant kochia is rapid due to high genetic diversity, short seed life and heavy reliance on herbicides for control in minimum- and no-till cropping systems. Kochia has developed resistance to four different herbicide sites of action.
Many kochia populations are resistant to multiple sites of action. One population in Kansas was resistant to all four herbicide sites of action (listed below).
Chemical control of even non-herbicide-resistant kochia can be difficult due to application and spray coverage issues, inadequate herbicide rates, adjuvant selection, plant size and environmental stress at time of application.