To make full use of in-crop rainfall, stored soil moisture and nutrients, and prevent weed seed contamination, the control of weeds in a pulse break crop phase is essential. Currently, herbicides are the primary method of weed control in broadacre cropping systems. However, there are limited options for broadleaf weed control in pulse crops, as there are few effective broadleaf post emergent herbicides available for use in faba bean and lentil. Along with limited control options, the presence of possible herbicide residues, such as sulfonylureas (SU), from previous crops are major deterrents for including pulses in a cropping rotation where there is an increased risk of herbicide damage. In recent years, Group B herbicide tolerant (HT) lentil and faba bean varieties have been released to Australian growers and have proven very popular for giving more flexible weed control options, particularly for late emerging broadleaf weeds. The Group B herbicide tolerance traits not only provide growers with in-crop options for broadleaf weed control, but also allow these pulse crops to be grown on Group B (including SU) herbicide residues, which can persist from previous crop applications for up to 24 months or longer, depending on rainfall (minimum of 700 mm) and soil pH (as per DuPont™ Glean® and Tackle® WG product labels).
The aim of these trials was to evaluate the levels of tolerance to simulated residues and post-emergent applications of Group B herbicides in lentil XT varieties, and a faba bean mutant derived line with Group B herbicide tolerance traits.
Key messages
High levels of crop safety were observed in imidazolinone tolerant lentil varieties, with no grain yield loss from any simulated residue treatments of sulfonylurea herbicides, or post-emergent applications of imidazolinone herbicides, at North Block in 2018, or Tooligie in 2019.
High levels of crop safety were observed in the imidazolinone tolerant faba bean variety, with no grain yield loss from any simulated residue treatments of sulfonylurea herbicides, or post-emergent applications of imidazolinone herbicides, at Yeelanna in 2019.
Access to herbicide tolerance traits will provide growers with an increased opportunity to diversify their cropping rotations and increase in-crop control options, specifically for broadleaf weed control in areas with high weed burdens.
Lead research organisation
South Australian Research and Development Institute
Host research organisation
South Australian Research and Development Institute
Trial funding source
GRDC DAV00150
Related program
N/A
Acknowledgments
Funding for this work was provided through GRDC project (DAV00150) and their continued support is gratefully acknowledged. The continued assistance from SARDI Agronomy groups at Clare, Minnipa and Port Lincoln is gratefully acknowledged and appreciated. We would also like to acknowledge support from property owners involved in this project.
Trial source data and summary not available Check the trial
report PDF for trial results.
Climate
Derived climate information
No observed climate data available for this trial. Derived climate data is
determined from trial site location and national weather sources.
Coulta SA
Tooligie SA
Yeelana SA
Coulta SA
NOTE: Exact trial site locality unknown - Climate data may not be accurate
Tooligie SA
NOTE: Exact trial site locality unknown - Climate data may not be accurate
Yeelana SA
NOTE: Exact trial site locality unknown - Climate data may not be accurate
SILO weather estimates sourced from https://www.longpaddock.qld.gov.au/silo/
Jeffrey, S.J., Carter, J.O., Moodie, K.B. and Beswick, A.R. (2001). Using spatial interpolation to
construct a comprehensive archive of Australian climate data , Environmental Modelling and Software, Vol
16/4, pp 309-330. DOI: 10.1016/S1364-8152(01)00008-1.
