Controlling Ryegrass in Spring - March 30, 2010
[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]