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Botrytis bunch rot (botrytis) can reduce grape yield and wine quality. Standardised assessment methods are needed to allow greater precision in wine making and to allow the use of disease management decision support models in grape production. This study developed a botrytis disease assessment key to assist the accuracy of visual disease assessment. Associated computer training software, designed to improve the accuracy of disease assessments, was also developed and tested. The mean absolute error in estimates of percentage botrytis severity was significantly (P<0.05) lower after eight assessors used the training software. Vineyard sample size required for estimation of disease severity was determined and a disease incidence-severity relationship for estimating severity from incidence was developed

Item Type:	Refereed Article
Keywords:	assessor training, disease assessment, incidence-severity relationship, variation, botrytis bunch rot.
Research Division:	Biological Sciences
Research Group:	Plant Biology
Research Field:	Plant Pathology
Objective Division:	Plant Production and Plant Primary Products
Objective Group:	Industrial Crops
Objective Field:	Wine Grapes
Author:	Evans, KJ (Dr Katherine Evans)
ID Code:	63498
Year Published:	2010
Deposited By:	Agricultural Science
Deposited On:	2010-05-10
Last Modified:	2012-03-06
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