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Cytology and Histology

Mycoparasitic Relationships: Cytology of the Sphaerotheca fuliginea-Tilletiopsis sp. Interaction. H. C. Hoch, Assistant professor, Department of Plant Pathology, New York State Agricultural Experiment Station, Cornell University, Geneva, 14456; R. Provvidenti, senior research associate, Department of Plant Pathology, New York State Agricultural Experiment Station, Cornell University, Geneva, 14456. Phytopathology 69:359-362. Accepted for publication 17 October 1978. Copyright 1979 The American Phytopathological Society. DOI: 10.1094/Phyto-69-359.

Sphaerotheca fuliginea (the cause of powdery mildew of cucumber) was controlled by an isolate of Tilletiopsis sp. on cucumber leaves in detached leaf culture. S. fuliginea was eradicated from infected cucumber leaves sprayed with a spore suspension of Tilletiopsis sp. The antagonist also protected cucumber leaves from establishment of powdery mildew. Light and electron microscopy of the Tilletiopsis sp.-S. fuliginea interaction revealed primarily a leaf surface phenomenon and not one involving direct cell penetration.