Use of Disease Forecasting Models for Control of Onion Downy Mildew in New Zealand

  • R. W. Chynoweth
  • R. M. Beresford
  • W. R. Henshall
  • P. J. Wright
Part of the Developments in Plant Pathology book series (DIPP, volume 16)


Onion downy mildew caused by (Peronospora destructor (Berk.) Casp. Ex Berk) can be responsible for large production losses in some years in onion-growing areas in the North Island of New Zealand. Losses arise when damage to foliage results in small size and poor storage quality of onion bulbs (Chupp and Sherf, 1960). The severity of disease is dependent on weather conditions and locality, with severity increasing in wet seasons (Fullerton et al., 1986; Wright, 1992).


Downy Mildew Spray Application Onion Bulb Leaf Wetness Disease Severity Index 
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Copyright information

© Springer Science+Business Media Dordrecht 2004

Authors and Affiliations

  • R. W. Chynoweth
    • 1
  • R. M. Beresford
    • 1
  • W. R. Henshall
    • 1
  • P. J. Wright
    • 2
  1. 1.The Horticulture and Food Research Institute of New Zealand LtdMt Albert Research CentreAucklandNew Zealand
  2. 2.New Zealand Institute for Crop & Food Research LimitedPukekoheNew Zealand

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