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Management of blueberry rust HAL BB13002 Rosalie Daniel Elizabeth Macarthur Agricultural Institute, NSW DPI [email protected]
| Date post: | 26-Dec-2015 |
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Management of blueberry rustHAL BB13002
Rosalie Daniel
Elizabeth Macarthur Agricultural Institute, NSW DPI
Blueberry rust (Thekopsora minima) Prefers warm (20oC), humid seasons, moist leaves Spread primarily by wind Damages leaves and fruit Where does it survive? Where do spores come from? When does it infect?
Biosecurity Tasmania
Disease cycle
NSW
Sexual cycle Asexual cycle
Hemlock
Caruso & Ramsdell 1995
Seasonal occurrence of rust
Chemical and biological fungicides and plant defence activators Field trial (cv. C99-42):
Applied every 2 weeks from February – July 2014
Chemical/activator FRAC
Mancozeb M3 P
Pristine (boscalid & pyraclostrobin ) 7 & 11 P & S
Dithianon M9 P
Metiram M3 P
Tebuconazole 3 S
Copper M1 P
Silica N/A NC
Development of rust symptoms
Proportion of leaf area covered with rust pustules two months after last spray (September 2014).
* *
Other chemical and biological treatments Lab and glasshouse trials:
Chemical/biological/activator FRAC
Cyprodinil (Chorus) 9
Cyprodinil & Fludioxinil (Switch) 9 & 12
Fenhexamid (Teldor) 17
Fludioxonil ( Scholar) 12
Pyraclostrobin & Boscalid (Pristine) 7 & 11
Azoxystrobin & Difenoconazole (Amistar) 11 & 3
Pyraclostrobin (Cabrio) 11
Procloraz (Octave) 3
Cyproconazole (Alto) 3
Bacillus subtilis (Serenade) 44
Chitosan NC
What works? Spores are present all year, particularly when there
is moisture No symptoms in trial until September (this year) Mancozeb, metiram, copper and pristine inhibited
symptoms Dithianon and tebuconazole also inhibit symptoms,
but residue problems Are the spores dormant over cooler months or do
they infect and not develop? How does the fungus infect the fruit?
Options for management of rust
Sanitation – Source clean planting material– Prune/remove infected and dead plant material
Spray after pruning, at leaf flushes, particularly if conditions are warm and moist
Identification and development of resistant varieties
Acknowledgements Maurizio Rocchetti, Costa Berry Exchange David Robertson, NSW DPI Damian Collins, NSW DPI Australian Blueberry Growers Association Horticulture Innovation Australia Limited
Contact:
(02) 4640.6217
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