New faba bean rust option
GroundCover™ Issue: 106 | Author: Cindy Benjamin
Pulse Australia industry development manager (southern and central) Wayne Hawthorne says the Australian Pesticides and Veterinary Medicines Authority (APVMA) has advised that Pulse Australia’s application for a new permit for tebuconazole use in faba beans and broad beans has been approved.
“This comes as a result of residue studies and trial work conducted by the GRDC-funded ‘Registration for minor use chemicals for the grains industry’ project,” he says.
"Rust in faba and broad beans has been more prevalent in recent years, particularly in southern Australia,” Mr Hawthorne says. “Tebuconazole has previously been approved for application early in the crop cycle to control the fungal disease cercospora, but now it can also be applied later in the season to control both cercospora and rust.”
Rust has the potential to reduce seed size and, if not controlled, could cause a reduction in yield of 30 to 40 per cent. While other products are available to control rust, Mr Hawthorne says having another option means growers can choose a cheaper product and can rotate fungicide groups to avoid resistance developing to a particular chemical group.
“Protecting crops from yield loss to diseases such as rust and cercospora is generally cost-effective,” Mr Hawthorne says. “Tebuconazole can be used in combination with other products to control other fungal diseases where necessary.”
The new permit also provides bean marketers with the assurance that grain will fall within maximum residue limits for chemical residues.
The new faba bean variety PBA Rana remains popular with growers for the 2014 season after strong performances in the market in 2012 and 2013, but it is susceptible to rust infection. This variety provides growers in the high-rainfall zone with access to markets for medium-sized faba beans of good quality. Premium prices were paid last harvest.
Faba beans have rotational benefits and fit into both mixed-farming and continual-cropping systems mainly in Victoria, South Australia and New South Wales. Faba bean crops will tolerate waterlogging better than other pulses, cereals and canola and can be grown on more acidic soil types, provided correct inoculation procedures are followed to ensure nodulation. They have also found a niche in some medium to lower-rainfall areas where they are sown early into no-till stubble systems.
The new permit for tebuconazole has been issued as PER13752 and applies from 31 May 2013 until 30 June 2016. A copy is available from the APVMA website (http://permits.apvma.gov.au/PER13752.PDF). The old permit (PER12657) and the three-day withholding period are no longer current. Significant changes to observe with the new permit are:
- where it is the only active in products containing 430 grams per litre of tebuconazole;
- long withholding periods (WHPs): 21 days for harvest and 14 days for grazing (adherence to these new WHPs should not be difficult for bean growers);
- approved use for rust and cercospora; and
- a maximum of three applications at 145 millilitres of product per hectare still applies.
More information:Pulse Australia,
0429 647 455,
GRDC Project Code AKC00004
Region National, South, North, West