View time: 38 minutes

Know thy enemy – biology of our most problematic crop weeds with Dr Catherine Borger

Bromegrass and barley grass are ranked as the fourth and ninth most detrimental weeds nationally.

These weeds cost growers $22.5 and $1.7 million per year, respectively. Understanding the ecology of these species is vital to developing a successful weed management plan.

A five-year GRDC project produced results on emergence patterns, seed bank persistence, seed shedding and competitive ability of great brome and barley grass, in Western Australia and South Australia (‘Seed bank ecology of emerging weeds’ UA00156).

The project found that three to four years seed set control was needed to remove a great brome or barley grass soil seed bank.

Great brome had high seed production in Western Australia and South Australia. Barley grass had much higher seed production in South Australia than Western Australia. Great brome grass and barley grass reduced crop yield, and in 2019, great brome at low to high densities reduced economic returns from a Mace wheat crop at Wongan Hills by $90-205/ha. Barley grass reduced economic returns of wheat by $67-138/ha.

Data on weed ecology and competitive ability was used to update a decision support tool; the Weed Seed Wizard (WSW).

The updated model was used to investigate harvest weed seed control (HWSC) as a potential management technique for great brome grass and barley grass.

The modelling indicated that harvest weed seed control is a valuable tool in the management of these species, even in the years where most weed seed is shed prior to harvest.

You can read Catherine’s paper here: Great brome and barley grass – modelling the long-term value of harvest weed seed control

Related Articles

View all
Video
Webinar

First cases of glyphosate and paraquat resistant ryegrass in WA

For the first time in Western Australia, annual ryegrass from a cropped paddock was found to be resistant to glyphosate and paraquat. Read More...
Video
Webinar

Precision weed control – where are we at?

Mark Saunders and Ben White (Kondinin Group) discuss the latest advances in spraying technology, green-on-green and green-on-brown camera developments, AI and robotics, drone and weed mapping, and targeted non-herbicide tools. Read More...
Video
Webinar

S-Metolachlor usage in the northern region

In this WeedSmart webinar, WeedSmart northern extension agronomist Paul McIntosh and Syngenta Field Biology Manager Rob Battaglia discuss how S-metolachlor works, its efficacy, and what potential resistance problems might be around the corner. Read More...
Video
Webinar

Can intercropping help with weed management?

Diverse rotations are a key aspect of the Big 6 and intercropping, despite its challenges, can provide opportunities for improving soils, weeds and risk management. Read More...
Video
Video

Peter Bach – Stripper front and chaff deck

...
Audio
Podcast

S06E34: Regional Update – Alex Davies, Farmer, York, WA

We had a small hiatus for the Regional Update due to school holidays, but we're back! We head to the Western Region in this episode and catch up with Today WA farmer, Alex Davies. Alex is based in York and has a continuous cropping farming system and also runs sheep. Alex also shares with us his experience about how the last three seasons have gone with having a Harrington Seed Destructor and the positive impact its had on helping in reducing weed burdens on his farm. Read More...

Subscribe to the WeedSmart Newsletter