Herbicide: Mode of Action - February 2012
[Video shows various pictures of soybean fields with specialists or agents in fields. Music plays in the background]
[Title Slide – Herbicide: Mode of Action. Your Arkansas Soybean Podcast. Presented by University of Arkansas Division of Agriculture Research and Extension University of Arkansas System, Arkansas Soybean Promotion Board.]
I’m Bob Scott, extension weed scientist, with the University o f Arkansas Cooperative Extension Service Division of Agriculture. [Dr. Scott standing in a field.]
Today I’d like to discuss with you Herbicide: Mode of Action. Herbicide Mode of Action simply refers to the way in which a herbicide controls weeds. Knowing your Herbicides Mode of Action has become more important over the past few years due to the development of herbicide resistant weeds. Specifically resistant palmer pigweed or palmer amaranth than roundup-ready soybeans have driven the need to use residual herbicides in roundup ready soybeans, conventional soybeans or liberty link soybeans.
Certain herbicides can have a different trade name and even a different common name but still be the same herbicide mode of action. Therefore understanding herbicide mode of action is critical to the development of a resistance management plan for resistant weeds and soybeans.
[Dr. Scott shows the MP44 publication and the weed control table and highlights the first column of the table.] For your convenience, in the MP 44, herbicide mode of action is now listed in the first column of the weeds control table for each herbicide section. For example, on page 36 of the weed response ratings for soybean herbicides, the first column is herbicide family.
Herbicide family is represented by a simply number. This number again refers to the way in which that herbicide controls weeds. The important thing is when developing a resistance management plan, is to use as many herbicides with different numbers that are still effective on the weeds that you have in your field.
[Narrator with music playing in the background] Your Arkansas Soybean Podcast is a production of the University of Arkansas System Division of Agriculture, and was funded impart by the Arkansas Soybean Promotion Board. For more information on soybean farming in Arkansas contact your local county extension office.
[Title slide – Your Arkansas Soybean Podcast. Video shows various pictures of soybean fields with specialists or agents in fields. U of A Division of Agriculture Research and Extension University of Arkansas System, Arkansas Soybean Promotion Board. For more information on soybean farming in Arkansas contact your county extension office or go to www.uaex.edu. Your Arkansas Soybean Podcast.]