The definition of herbicide resistance according to the Weed Science Society of America is the acquired ability of a weed population to survive a herbicide application that was previously known to control the population.
This means that doing the same thing year after year to control weeds is probably not going to work 100 percent.
Say you apply a herbicide and get 95% control. One marestail weed can produce up to 20,000 viable seeds, so allowing even one of those weeds through will cause big problems for subsequent years.
Herbicide resistance is a problem facing Nebraska's farmers. The Weed Science Society of America says there are six confirmed and many other unconfirmed types of herbicide resistant weeds in Nebraska. Examples include Kochia, Giant Ragweed, Marestail and Palmer Ameranth.
The solutions to battling herbicide resistance include spraying early and often, using a herbicide or herbicide tank mix with multiple modes of action, and monitoring your fields for herbicide resistance weeds on a regular weekly basis.
If that is impossible, consider hiring an agronomist such as the ones at Servi-Tech to assist in developing and executing a herbicide plan. Contact Servi-Tech at 1-800-557-7509 for more information. Or go online to servi-techinc.com.