 Soybean
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Controlling Ryegrass in Spring
March 30, 2010
(1 minute: 43 seconds)
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(1 minute: 43 seconds)
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Audio/Video Script:
[Title Slide – Controlling Ryegrass in Spring. Dr. Bob Scott,
Extension Weed Specialist. Your Arkansas
Soybean Podcast, University of Arkansas Division of Agriculture, Arkansas
Soybean Promotion Board. Number 29 - March 30, 2010]
[Dr. Bob Scott] Because of years of use in Arkansas we have a tremendous
problem with Holon resistant ryegrass. And that product is not really used as
much in the state as it used to be. The three main options for ryegrass this
time of year are Axial XL, PowerFlex, and Osprey herbicide. Axial XL is strictly
a ryegrass material. It only controls ryegrass in wheat. If you have broadleaves
you need to tank-mix with another herbicide. Both Osprey and Powerflex will
control not only ryegrass but also a fairly broad spectrum of broadleaved weeds.
However if this spectrum includes weeds like wild-garlic and horseweed, it may
be necessary to add a tank-mix partner to the Osprey or the Powerflex.
One issue that always comes up this time of year in making applications is
the temperature. [Picture of a tractor in the field.] We like to see night-time
temperatures above forty five degrees for optimum activity of post-emergence
ryegrass materials in the spring. [Slide - above 45 degrees (drawing of a moon
and stars; timing restrictions (drawing of a bag of fertilizer)] In addition
many of these post-emerge herbicides have got fertilizer restrictions that
require anywhere from seven to twenty-one days between the application of
fertilizer and the application of herbicide in order to avoid injury.
[Narrator] Your Arkansas Soybean Podcast is a production of the University
of Arkansas Division of Agriculture and was funded in part by the Arkansas
Soybean Promotion Board. For more information on soybean farming in Arkansas
contact your local county Extension Office.
[Title slide - For more information
contact your local county Extension office. Your Arkansas Soybean Podcast,
University of Arkansas Division of Agriculture, Arkansas Soybean Promotion
Board]
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