Abstract

Cystospores of Phytophthora syringae were able to germinate at temperatures between 0-25°C, with an optimum at 15-20°C, but failed to germinate at 30°C. The germ tube attained 50μm long or more after 6hr at 15-20°C. The fungus achieved invasion into lenticel tissue in 8hr at 15°C, when inoculated with zoospores. Under light microscope and scanning electron microscope, it was observed that the infection could occur, not only through lenticels but also through cracks in the cuticle.

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