Management of Grape Diseases in Arid Climates



Diseases of grapes are important limiting factors in producing wine and table grapes. Powdery mildew is the most important disease of grapes and is managed with cultural practices and by the application of fungicides. Fungicides are used most effectively if applied according to disease forecasting models and alternated to avoid fungicide resistance. Bunch rot is an important disease on some grape cultivars and in the more humid vineyard locations. It is managed by cultural methods such as leaf removal, hedging, and shoot positioning. Its control relies on the use of fungicides often combined with those used for powdery mildew. Fungicides for Bunch rot control are generally applied four times over the growing season according to the calendar or are based on disease forecasting models. Crown gall is an important disease in cool areas where freezing damage occurs in winter and it is managed primarily by cultural methods. Rootstock selection, heat treatment, and shoot tip propagation of cuttings have been shown to exclude the pathogen from new plantings. Biological control of the pathogen appears to be promising but has not been used commercially. Postharvest decay is an important problem in stored table grapes. Decay is controlled by sulfur dioxide fumigation but alternatives to this treatment are needed because of the possibility of high sulfite residues and bleaching of the berries. Acetic acid or ozone fumigation appears to be promising alternatives.


Powdery Mildew Downy Mildew Grape Berry Botrytis Cinerea Crown Gall 
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© Kluwer Academic Publishers 2004

Authors and Affiliations

  1. 1.Pacific Agri-Food Research CentreAgriculture and Agri-Food CanadaSummerlandCanada

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