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Mode of Entry by Pythium perniciosum into Strawberry Roots. S. Nemec, Research Plant Pathologist, Plant Science Research Division, ARS, USDA, Carbondale, Illinois 62901; Phytopathology 61:711-714. Accepted for publication 26 January 1971. DOI: 10.1094/Phyto-61-711.

Pythium perniciosum zoospores were produced in the presence of excised and intact Blakemore strawberry roots. Zoospores typically accumulated on the root in the region of elongation. Zoospore germ tubes penetrated root hairs and the root epidermal surface. Hyphae that grew into water around excised and intact roots penetrated root hairs and epidermal cells on the root surface.

Additional keywords: Fragaria chiloensis var. ananassa, root rots.