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Plasmopara obducens
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    Plasmopara obducens

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    Plasmopara obducens
    Scientific classification edit
    Kingdom: Chromista
    Phylum: Oomycota
    Order: Peronosporales
    Family: Peronosporaceae
    Genus: Plasmopara
    Species:
    P. obducens
    Binomial name
    Plasmopara obducens
    (J. Schröt.) J. Schröt., (1886)
    Synonyms
    • Peronospora obducens J. Schröt., (1877)
    • Rhysotheca obducens (J. Schröt.) G.W. Wilson, (1907)
    • Peronospora impatientis Ellis & Everh., (1892)
    • Plasmopara impatientis (Ellis & Everh.) Berl., (1898)

    Plasmopara obducens is a species of oomycete that causes Impatiens downy mildew. It was first described on Impatiens noli-tangere in Germany in 1877. Plasmopara obducens is known from native species of Impatiens since the 1800s, but outbreaks on cultivated varieties of Impatiens walleriana started in 2003 in the United Kingdom and in 2004 in the United States. The outbreak spread worldwide by 2016.

    Morphology

    Sporangiophores are an average of 373 (260-484) micrometers with the first branch appearing at 197 (120-271) micrometers. Sporangia are 16 (13-18) micrometers by 13 (11-16) micrometers. Resting spores are globose with a diameter of 28 micrometers

    Disease symptoms

    Initially, leaves are stippled or yellowed. Infected leaves curl downward. A white down is often present on the underside of the leaves; buds and stems may also develop a down. Eventually, the leaves fall off the plant leaving just stems. In about a week, the plants are dead.

    Taxonomy

    J. Schröter originally placed the species in the genus Peronospora but later moved it to the genus Plasmopara. Some authors believe the outbreaks on I. walleriana and I. balsamina are not caused by P. obducens but two new species P. destructor and P. velutina.

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