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Characteristics and pathogenicity of six Phytophthora isolates from pot plants

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Abstract

From several greenhouse plants showing foot and root rot symptomsPhytophthora isolates were gathered. Isolates fromPeperomia, Saintpaulia andSinningia were identified asP. nicotianae van Breda de Haan var.nicotianae and an isolate fromBegonia asP. cryptogea Pethybr. & Laff. Cardinal temperatures for the various isolates were determined. The specific and non-specific pathogenicity of the isolates was studied by inoculating the different crops with the different isolates, including aP. cryptogea isolate fromGerbera and aP. nicotianae var.nicotianae isolate from carnation.

TheP. nicotianae var.nicotianae isolates appeared to be morphologically identical. Some of the isolates were similar in host range, but others exhibited differences in host specificity at 20°C as well as 25, 30 or 35°C. The same applies for the twoP. cryptogea isolates.

Samenvatting

Van verschillende potplanten met voet- en wortelrotsymptomen werdenPhytophthora-isolaten verzameld. De isolaten vanPeperomia, Saintpaulia enSinninga werden gedetermineerd alsP. nicotianae var.nicotianae en het isolaat vanBegonia alsP. cryptogea. Van deze isolaten en van eenP. nicotianae-isolaat uit anjer en eenP. cryptogea-isolaat uitGerbera werden de kardinale temperaturen bepaald en door middel van kruisinoculaties de pathogeniteit ten opzichte van enkele waardplanten. De pathogeniteit ten opzichte van de verschillende gewassen bleek verschillend te zijn. Deze verschillen waren hetzelfde bij temperaturen van 20, 25, 30 of 35°C.

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Author notes

  1. H. Rattink

    Present address: Research Institute for Plant Protection (IPO), Wageningen, the Netherlands

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    1. H. Rattink
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    Stationed at the Research Station for Floriculture, Aalsmeer, the Netherlands.

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    Rattink, H. Characteristics and pathogenicity of six Phytophthora isolates from pot plants. Netherlands Journal of Plant Pathology 87, 83–90 (1981). https://doi.org/10.1007/BF01976643

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