Abstract
In naturally infected fields by Exobasidium vexans, a large number of basidiospores of E. vexans were found on the underside of young tea leaves of first crop and second crop. About 40 and 10% of the spores observed were germinated, and about 50% of germinated spores formed appressoria. The most of appressoria were formed on junctions between epidermal cells and a few of them were formed on the pore openings of stomata.
Some of appressoria on junctions between epidermal cells and pore openings of stomata germinated and then formed infection hypha penetrating into the host tissues. But, the formation of infection hyphae were very rare.
