WEED CONTROL IN LUCERNEBack to Technical Insights
Good weed control is essential for high lucerne yields and good stand life. Weeds can also affect the palatability and feed value of lucerne silage and hay and can harbour insect pests.
Lucerne weed control can be split into two distinct periods – weed control during establishment and weed control during the productive life of the stand. During establishment it is critical to control all weeds since they can negatively impact stand density. Note that while some herbicides can be used in both establishing lucerne and mature stands, some of the chemicals used for weed control during the establishment phase are different to those used in mature stands.
For established stands, herbicide selection should be based on weed species present so be constantly alert to changing weed problems and their densities in the field. The ideal time to check for weeds is during the late autumn to early spring when lucerne growth rate is low. The decision to use herbicides for weed control in established lucerne should be based on the amount and type of weeds present and the lucerne stand density. Mowing prevents weed seed production and causes perennial weeds to grow from roots. Repeated mowing can suppress some persistent weeds by gradually reducing their root reserves.
There are a range of herbicides available for weed control in lucerne. Details of herbicide options for control of a range of weeds can be found below. Please note that neither the list of weeds controlled nor the list of herbicides registered for use on lucerne is exhaustive. These tables are intended as a guideline only. Always refer to an agricultural chemical manual and read the manufacturer’s instructions prior to herbicide use. Often a broader range of weed species can be controlled using a tank-mixed combination of two or more herbicides. Refer to your Pioneer Area Manager, seed merchant or chemical company representative for further advice.
When using any herbicides, always follow the manufacturer’s instructions for rate and timing of application and product mixing carefully. Ensure that empty containers are disposed of as recommended by the manufacturer. Also ensure that any product withholding periods are carefully observed.
In the following tables weed control is split into broadleaf weed and grass weed control.
HERBICIDES FOR BROADLEAF WEED CONTROL
|Apple of Peru||C|
|Clover – red||EC||C||TC|
|Clover – subt.||EC||C||TC||EC|
|Clover – white||EC||C||TC||EC|
|Docks – seedling||EC||P||A||C|
|Docks – regrowth|
HERBICIDES FOR GRASS WEED CONTROL
|Green bristle grass||C|
|Knawed canary grass||C|
|Lesser canary grass||C|
|Ryegrass – annual||EC||C||C||C||EP||EC|
|Ryegrass – perennial||C||C||C|
|Rough bristle grass||C||C||C|
|Soft brome grass||C||C||C||P|
|Yellow bristle grass||C|
KEY TO TABLES
# May need to be tank mixed (see manufacturers instructions).
C Weed is well controlled.
A Weed is controlled in the seedling stage only.
P Limited control of weed.
* Use on established stands only.
Please note: Neither the list of weed controlled nor the list of herbicides registered for use on lucerne is exhaustive. These tables are intended as a guideline only. Always refer to an agricultural chemical manual and read the manufacturer’s instructions prior to herbicide use. Often a broader range of weed species can be controlled using a tank-mixed combination of two or more herbicides. Refer to you Pioneer Area Manager, seed merchant or chemical company representative.
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The information in this publication is general in nature only. Although the information in this publication is believed to be accurate, no liability (whether as a result of negligence or otherwise) is accepted for any loss of any kind that may arise from actions based on the contents of this publication.
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Revised: June 2015
Expires: June 2018