Case Studies

R&D fine-tunes fungicide for pyrethrum

Dr Jason Scott TIA pyrethrum

New research indicates that Tasmanian pyrethrum growers could increase yields while also reducing input costs for fungal control.

Researcher at the Tasmanian Institute of Agriculture (TIA), Dr Jason Scott, has been working with Tasmanian pyrethrum growers and field agronomists from Botanical Resources Australia (BRA) – and early results are promising.

“Final results will be released when the project is completed later this year, but the results collected over the last couple of seasons are showing promising signs that we can help growers to reduce their fungicide usage without compromising yields,” Dr Scott said.

Managing fungal diseases, especially in spring, will help the industry work towards a projected 25% expansion in this year’s crop, he added.

“We think we can help industry to be more efficient and effective in its use of disease protocols and potentially reduce their usage of chemicals. Part of the project is to evaluate what current disease protocols are being use by industry and how they can be modified, made more strategic or potentially removed.”

“A lot of the disease controls currently available to industry are chemical based, and it looks like we’ll be able to be smarter about when about when these are applied making them more effective, but also reducing the amount overall that has to be applied without a loss of yield or efficiency.”

Over the past three years, Dr Scott and his team have been conducting field trials on commercial pyrethrum farms in Tasmania. They have also conducted surveys of around 30 commercial crops each year. This involved taking leaf samples during spring and flower samples during summer to identify what diseases are present at different times during the season.

“We are looking at what fungi are present at different times during the season and whether there is a correlation between leaf and flower diseases,” he said.

“Some early indications from the research are showing us that the flower diseases that the industry has been controlling for are a lot less prevalent now, especially in dry years. If this continues to play out, this is good news as it means there’s a real opportunity to reduce spray costs here.”

Conducting trials on commercial crops means that the research is very collaborative and industry get to see results quickly.

“Part of the benefit of working on commercial farms and working with the staff at BRA is that they’re able to take the information and use it to make on-farm changes very quickly,” Dr Scott said.

“The industry has made changes to their disease management protocols already as a result of the project, including more efficient chemical use and using different treatments in second and third-year crops to better-manage the chemical effectiveness.”

The project is titled ‘Integrated disease management in pyrethrum’ and was funded by Hort Innovation using industry levies and funds from the Australian Government, along with in-kind support from TIA and BRA.

TIA is a joint venture between the University of Tasmania and the Tasmanian Government.

Source: TIA

Featured Image: Dr Jason Scott