New benchmark for grass, broadleaf weed control is coming
Consistent results from extensive crop trials over a number of years is sending strong signals to wheat and barley growers that a new industry benchmark for grass and broadleaf weed control is coming in 2022.
Renowned for its product development and trial rigour prior to releasing new products, Bayer is anticipating its new Mateno® Complete grass and broadleaf weed pre-emergent and early post-emergent herbicide to be available for next season.
How it works
Mateno® Complete introduces a new herbicide mode of action for Australian wheat and barley growers, aclonifen (Group 32), an SPS (solanesyl di-phosphate synthase) inhibitor, in a complementary co-formulation with pyroxasulfone (Group 15 – formerly K) and diflufenican (Group 12 – formerly F) herbicides.
Aclonifen is mainly taken up through the leaves of young seedling grass and broadleaf weeds following early post-emergent application. For broadleaf weeds yet to emerge at this time of application, uptake is by the hypocotyl of the weeds as they emerge through the moist soil surface. This mode of uptake complements that of the other active ingredients, resulting in multiple weed uptake pathways that delivers reliable control across a range of early weed growth stages.
In wheat, Mateno Complete can be used at early post-emergent to provide weed control across the complete soil surface, including in the furrow, on the furrow shoulder and in the inter-row, or incorporated by sowing in both wheat and barley to give more reliable control of grass weeds.
It offers flexible application rates in wheat, with the higher rate when incorporated by sowing, offering a higher level of control of annual ryegrass, barley grass, annual phalaris, silver grass and toad rush and suppression of wild oats, great brome and capeweed. Used early post-emergent, it offers control of small silver grass, toad rush, wild radish, capeweed and prickly lettuce and suppression of annual ryegrass, barley grass and doublegee/spiny emex. The flexible rates also help deliver value across different cropping scenarios and environments.
Gus MacLennan, market development agronomist with Bayer in New South Wales, said a herbicide controlling both grass and broadleaf weeds with its particular residual activity, as well as providing the benefits of a new mode of action, had not been seen for many years in the industry.
“The flexibility Mateno Complete offers in weed spectrum and use patterns is really unique and it’s also expected to be registered for use with disc seeders in wheat. Disc seeding systems are rapidly increasing and there is a lack of registered herbicide options for growers to use with these seeders,’’ Gus said.
Promising trial results
The majority of the company’s trial program in recent years has focused on Mateno Complete, culminating in more than 100 large area evaluation trials on farms across the country this season, to thoroughly investigate a range of aspects from crop safety through to weed control efficacy.
Gus said the conclusion was that when applied early post-emergent, following an effective pre-emergent herbicide, Mateno Complete “sits head and shoulders’’ above many alternate herbicides – “by a fair margin’’.
“With early post-emergent applications, we have seen residual control of grass and broadleaf weeds push further into the season, in some cases resulting in season-long grass weed control.’’
“One of the best strategies seen in wheat trials has been to use a suitable pre-emergent herbicide with a different mode of action incorporated by sowing, and then to apply Mateno Complete early post-emergent just after the one-leaf crop growth stage.’’
Craig White, market development agronomist with Bayer in Western Australia, said the patented synergy between the active ingredients in Mateno Complete was highly effective for grass and broadleaf weed control and this had been reflected consistently in the trials.
“Across all the trials, and including in different seasons, paddocks, soil types, stubbles, rotations, environments, rainfall patterns, with different machinery and for different weed spectrums, there has been an overall increase in the weed control percentage compared with alternate herbicides. It continues to deliver consistency of performance – and that generates a high level of confidence in
Mateno Complete. And having high confidence in a product is a very important part of overall weed management programs and cropping systems,’’ Craig said.
Among agronomists who have viewed various Mateno Complete trials, Nick Eyres, with Elders at Geraldton in Western Australia, said the new herbicide would be welcomed considering the hard-tomanage weed spectrums in the State’s northern wheatbelt.
“We have some pretty awesome populations of annual ryegrass and wild radish, so coming up with a tool like Mateno Complete that can help us out in that regard is going to be very helpful,’’ Nick said.
Article written by Bayer for Seasons magazine.
Elders offers a range of crop protection products by Bayer.