Bunch rots

Bunch rots of grapes are widespread in Western Australia and reduce yield and quality. Weather conditions and control strategies influence the severity of losses which can vary between vineyards. These bunch rots can affect both wine and table grapes and control options differ depending on location, variety and trellising.

Bunch rots can be caused by several different fungi, many of which produce similar symptoms on the berries. Confusion over the cause of the bunch rot can lead to poor management decisions and crop failures.

Accurately identifying the cause of a bunch rot on your vines is critical so the correct control strategy can be implemented.

Practical

Non-Botrytis Rots
https://www.wineaustralia.com/growing-making/pest-and-disease-management/non-botrytis-bunch-rots

Botrytis – overview – Vitinotes
https://www.awri.com.au/wp-content/uploads/botrytis_intro.pdf

Managing botrytis – Vitinotes
https://www.awri.com.au/wp-content/uploads/botrytis_management.pdf

Botrytis – Monitoring – Vitinotes
https://www.awri.com.au/wp-content/uploads/botrytis_monitoring.pdf

Botrytis – symptoms – Vitinotes
https://www.awri.com.au/wp-content/uploads/botrytis_symptoms.pdf

Botryosphaeria and bunch rot – Vitinotes
https://www.awri.com.au/wp-content/uploads/botryosphaeria.pdf

Know your grapevine bunch rots (Agriculture W.A.)
https://www.agric.wa.gov.au/summer/know-your-grapevine-bunch-rots

 

Technical

Botrytis Rot
https://www.wineaustralia.com/growing-making/pest-and-disease-management/botrytis

Botrytis bunch rot assessment – key diagrams showing the severity of infection for objective assessment
 https://www.researchgate.net/figure/Botrytis-bunch-rot-severity-assessment-key-Lighter-areas-represent-healthy-berries_fig1_266022493

Determining bunch rot impact on wine quality
https://www.dpi.nsw.gov.au/__data/assets/pdf_file/0003/1158087/Determining-bunch-rot-impact-on-wine-quality.pdf

Non – botrytis bunch rots – identification and management
https://cdn.csu.edu.au/__data/assets/pdf_file/0006/455199/NWGIC-fs7-bunchrot.p

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