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• W659483013 abstract "Botrytis bunch rot (BBR) of grapes caused by the fungus Botrytis cinerea, can causeyield and quality implications. This study investigated the epidemiology andmanagement of BBR in a cool climate, specifically in the Coal River Valley andRokeby regions of Tasmania. Field trials were part of a larger project investigatingspray timing and risk factors associated with BBR.Currently there is a shift to develop and use novel methods in the study of BBRepidemiology because they have the potential to provide assessment of total infectionof the disease and not just visible disease. Symptoms may not be evident until fruitripening, even though infection may have occurred weeks or months earlier. As partof this project, a duplex qPCR technique was developed based on a previouslypublished qPCR technique targeting the intergenic region of the B. cinerea sequence.The assay was developed specifically to use on wine grapes with the internal controltargeting Vitis vinifera DNA. The assay was modified and adapted to suit laboratoryequipment available and then used to detect and quantify B. cinerea DNA from totalnucleic acids extracted from grape berry samples.A study, using qPCR and visual assessment, was conducted during the 2008-09season to track natural infections of B. cinerea in grape berries sampled fromcommercial vineyards in the period pre-bunch closure until harvest. Temporalprogress curves of disease severity were generated using data from two V. viniferacultivars: Riesling and Sauvignon Blanc from different vineyards. The qPCR resultsconfirmed that infection and colonization of the fruit occurs during the early stages ofberry development, followed by a latent period. Disease expression during fruitripening increased with time.The latent infection pathway was determined to be more important than the necrotictissue pathway, in a small plot trial conducted in 2007-08. Treatments included fourdifferent spray programs with and without removal of bunch trash (decaying floralparts which include calyptras and aborted berries). The trial was also used to investigate use of qPCR, an ELISA QuickStix™ test and mid-infrared spectroscopyto determine B. cinerea levels in juice samples. QPCR clearly showed that thefungicides reduced B. cinerea load while the ELISA tests were able to statisticallyseparate the treatments. Spectroscopy and visual assessments were unable tostatistically separate treatment effects, but there was a positive correlation betweenvalues measured using each method.A whole-of-block experimental procedure was conducted during the 2008-2009growing season to investigate spatial variation of BBR within a vineyard. Vinevigour, measured as plant cell density, was found to positively correlate with BBRseverity. Disease increase was attributed to berry-to-berry spread, not that of newinfections. The trial also investigated the effect of early (flowering) versus midseason(PBC) spray application and both qPCR and visual assessments demonstratedthat the PBC application was more effective than the flowering application.This project clearly demonstrated that qPCR methods can complement traditionalvisual assessments in the quantification of BBR, and showed the usefulness forassessing management practices such as fungicide application and vineyard variation,and for determining vineyard factors that contribute to increased disease." @default.
• W659483013 created "2016-06-24" @default.
• W659483013 creator A5044057729 @default.
• W659483013 date "2014-05-01" @default.
• W659483013 modified "2023-09-27" @default.
• W659483013 title "Novel application of methods to investigate epidemiology and management of botrytis bunch rot in wine grapes" @default.
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• W659483013 hasPublicationYear "2014" @default.
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