Screening of <em>Impatiens walleriana</em> cultivars for susceptibility to <em>Plasmopara obducens</em>

Authors

  • Ulrike Brielmaier-Liebetanz Julius Kühn-Institut (JKI) – Bundesforschungsinstitut für Kulturpflanzen, Institut für Pflanzenschutz in Gartenbau und Forst, Braunschweig
  • Elke Idczak Julius Kühn-Institut (JKI) – Bundesforschungsinstitut für Kulturpflanzen, Institut für Pflanzenschutz in Gartenbau und Forst, Braunschweig

DOI:

https://doi.org/10.5073/JfK.2012.05.01

Keywords:

Resistance, downy mildew, Busy Lizzie, screening test, ornamentals

Abstract

The infestation of Impatiens walleriana with the downy mildew fungus Plasmopara obducens has become a serious problem. Inspite of fungicide use during production, losses in the field increased significantly during the last years. The growing of resistant cultivars would be a good solution to face this problem. Seedlings of I. walleriana were tested for their susceptibility to P. obducens in growth chambers. They were inoculated with a sporangia suspension and assessed for infestation two weeks later. The percentage of plants which showed development of sporangia was determined. 52 cultivars out of nine series of the current I. walleriana assortment were tested. In two replicates all cultivars proved to be highly susceptible to P. obducens.

 

 

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Published

2012-05-01

Issue

Vol. 64 No. 5 (2012)

Section

Original Article

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