This poster describes new fungicide treatments to replace procymidone (suspended by APVMA) for control of onion white rot on bunching onions.
Application methods and infection criteria to improve the efficacy and timing of fungicide sprays, were also investigated.
- Procymidone (Sumisclex™) applied properly did not provide effective control of white rot on spring onions.
- Boscalid (Filan™) was highly effective controlling white rot and therefore is a suitable replacement for procymidone.
- Tebuconazole (Folicur™) showed potential for effective white rot control but its use could be limited due to the withholding period.
- Azoxystrobin (Amistar™) and triadimenol (Bayfidan™) also showed potential for the control of white rot, especially for use integrated with boscalid or tebuconazole.
- Fungicide efficacy, application timing and methods and residue data were collected to support applications for minor use permits for the fungicide treatments.
There were many people and organisations that provided assistance to make this research possible. They include:
- DPI personal Craig Murdoch and Slobovan Vujovic for assistance with technology transfer activities.
- Peta Easton for technical assistance and Dr. Liz Minchinton for collection of survey data in NSW and SA.
- John Hunt of Agrimm Technologies Ltd for his valuable advice on biocontrol trial preparation and Rob Stanic for arranging supply of Trichopel Ali52 and other products for field trials.
- Doug Wilson and Paul Geister (NuFarm) for advice with fungicides and Elliott Chemical and Serve- Ag Research for supplying DADS for field trials.
- Peter DalSanto (AgAware Consulting) for advice with fungicides and processing minor use permits for fungicide treatments.
- Soheir Salib, Department of Primary Industries, Knoxfield for assistance in establishing and harvesting field trials and reviewing this manuscript.
- The spring onion growers in Victoria who graciously allowed trials on their farms and provided assistance in their establishment, maintenance and harvest.
- Agrochemical companies for providing samples of fungicides and other companies for supplying biological products for laboratory, glasshouse and field work.
The authors thank the members of the Steering Committe, Rocky Lammatina, Tony Lammatina, Craig Arnott, Karl Riedel and others for their valuable advice to this project.
This project was commissioned by Horticulture Australia Limited with funds frrom the Vegetable R&D levy..
The Australian Government provides matched funding for all HAL’s R&D activities.