Barley Grass in Pasture

Barley Grass is becoming a real problem in pastures. It is generally found in relatively compact areas on the edges of paddocks and in stockyards, but is spreading more and more into areas of pasture, severely affecting the nutritional value of the grazing. To prevent the spread of Barley Grass, it is advisable to treat the problem whilst it is still contained in relatively compact areas, in order to keep the overall costs down.

If you have Barley Grass in your pastures, then Ethosin will be a good option to control it. Timing is important when applying Ethosin. Application should be after the main germination has occurred following autumn rains, usually from June to July. Ethosin has residual activity for about 8 - 10 weeks, therefore timing is essential in order to ensure that the residual activity is effective during the period of germination.

For the best results, apply Ethosin to pastures grazed down to 3cm - 5cm in height, then allowed to freshen up and when the soil is moist (an important factor in ensuring the maximum efficiency of the chemical). Do not apply after the end of July. It will not be controlled by this chemical in the green seedhead stage. It is important to be aware of the window of time for application of this chemical, so that you do not miss the boat and lose this opportunity.
Note that temporary suppression of clovers can be expected. Note also there is a stock withholding period of 28 days.

Barley Grass in the photo below is growing on the edges of pasture, a common sight. By controlling it at this stage, you can avoid major expenses at a later stage.

In non cropland areas, another option would be to use a combination of Glyphosate and Gardoprim (eg 100mls Glyphosate and 250mls Gardoprim per 10lts water), which would target both the growing plant and germinating seeds.

Poa Annua in Ryegrass

Many autumn sown pastures will be going in, and for control of Poa in these pastures, Ethosin at 1.5lts/ha is a very effective option. This will be effective both pre and post emergent, and should be applied around germination to moist soil, a very important factor in ensuring the effective working of the chemical. Poa is very competitive, and can be a serious contaminant, so effective control of this weed is essential.

NB When applying a chemical, always read the label carefully, and comply with all the instructions on the label

Steve Lawson is the ATS Field Rep. Please contact him for any further information or assistance, or if you would like an on farm visit. He may be contacted by mobile:
027 24 55 661, or via ATS during working hours. Or e-mail steve@ats.co.nz