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Management of blueberry rust HAL BB13002 Rosalie Daniel Elizabeth Macarthur Agricultural Institute,...

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Management of blueberry rust HAL BB13002 Rosalie Daniel Elizabeth Macarthur Agricultural Institute, NSW DPI [email protected]
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Management of blueberry rustHAL BB13002

Rosalie Daniel

Elizabeth Macarthur Agricultural Institute, NSW DPI

[email protected]

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:

[email protected]

(02) 4640.6217


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