Voorkomen van uitval bij Impatiens walleriana onder veldcondities

J.D. Hofland-Zijlstra, R.S.M. de Vries, W. van Wensveen, S. de la Fuente van Bentem

    Research output: Book/ReportReportProfessional

    Abstract

    Abstract Wageningen UR Greenhouse Horticulture, together with Syngenta Seeds performed field trials with fungicides and fertilizing products to prolong the consumer value of Impatiens walleriana (busy lily). This project was funded by the Dutch Horticultural Board. The plants were situated on two field locations, both in the field and in pots to follow the natural disease development with and without interaction with soil pathogens (e.g. downy mildew). The results of this study show that Ridomil Gold is effective against early infestation from soil propagules of downy mildew, but there is no effectivity against leaf infections. Products based on phoshite (potassium phosphite, product X of Everris) slow down the infection process with a few weeks. Especially, later in the season when the conidia are most dominantly present. It is recommended to screen multiple products which are effective against resting spores of downy mildew. Sensitive Impatiens species should preferably be planted early in the season and not directly in soil with high risk of surviving propagules.
    Original languageDutch
    Place of PublicationBleiswijk
    PublisherWageningen UR Glastuinbouw
    Number of pages32
    Publication statusPublished - 2012

    Publication series

    NameRapporten GTB
    PublisherWageningen UR Glastuinbouw
    No.1160

    Keywords

    • pot plants
    • ornamental plants
    • impatiens walleriana
    • ornamental value
    • soilborne pathogens
    • cultural control
    • peronospora farinosa
    • outdoor cropping

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