1978•Canadian Journal of Plant ScienceOpen access

SUDDEN WILTING OF POINSETTIA (EUPHORBIA PULCHERRIMA) CAUSED BY PYTHIUM APHANIDERMATUM

A. T. Bolton

Abstract

Poinsettia (Euphorbia pulcherrima Willd.) cuttings imported from California became severely wilted 5–6 wk after planting at Ottawa. Isolations made from these plants yielded cultures of Pythium aphanidermatum (Edson) Fitzp. Pathogenicity tests demonstrated that this fungus caused severe wilting of poinsettia cuttings in 2 days and complete necrosis in 6 days.

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Key concepts: Poinsettia, Pythium aphanidermatum, Wilting, Euphorbia, Biology, Cutting, Sowing, Pythium