Try a couple of methods
I DID predict that we would have a large suite of weeds after the deluge of rain a couple of weeks ago.
This plethora of summer and winter weeds that we are now seeing in our pastures, our cultivations and even in our house yards, really are taking advantage of bare areas in our various situations.
I was recently viewing a friend’s pasture paddock and was not overly surprised that the dry and hot summer we have just been through, coupled with grazing practices by livestock and roos, had left very little pasture vegetation.
Also these surviving plants with the size shrinkage and reduced number per square metre of theses useful grasses, had therefore left lots of bare ground.
Needless to say after the significant rainfall many of us received, these bare areas are now full of new weeds.
Not just the “plants out of place” definition of a weed, but real weeds like stramonium, noogoora, amaranthus, clockweed, fleabane, and that pretty yellow flowered turnip of course.
I imagine in central Queensland a similar weed spectrum coupled with parthenium, plus many others.
The obvious answer is to spray them with a suitable herbicide, however some care needs to be taken with the choice of product and any livestock grazing withholding periods.
The old days of the 70 and 80s are gone as far as just spraying the paddocks while the cows are up the other end.
I have regularly recommended in grass pasture paddocks only, Brushoff/Lynx/Associate plus many other generics, which all have the same active ingredient (metsulfuron methyl) in this Group B mode of action classification.
Notice I said grass pastures.
If you have a broadleaf pasture plant like a medic visible, then you will do some damage or outright kill this part of your pasture mix with the above mentioned products.
Now this metsulfuron methyl herbicide is handy and a very economic product, however it does not control every broadleaf plant you have, so you may need to do a weed spectrum assessment and consider tank mixing with another broadleaf herbicide.
A broadleaf product like 24-D or Fluroxypyr, both from the Group I class, maybe tank mixed with your sulfonylurea product.
That all sounds fairly easy, however I do not want you running out spraying this mix all over the countryside, particularly in those peri urban locations. By peri urban I refer to those edge of towns and cities area, where weed control goes out the door.
These situations plus other paddocks with broadleaf sensitive plants right next door, do need serious avoidance by you with your spraying endeavours.
The avoidance is that of spray drift.
Spray drift is those tiny little aerosol size droplets that get caught in the winds and breezes, to go over the fence onto someone cabbages, tomatoes, petunias, roses, onions, lettuce, grapes, cotton, sunflowers plus many other broadleaf plant species.
That is where chip hoes come in handy.
So whilst I dislike seeing weed heaven in various areas, spray drift needs to avoided at anytime.
So give your grass plants a fair go and get rid of by any means you choose , of those moisture sucking and very competitive weeds.
INVASIVE: Clockweed at its worst in southern Queensland.