The physiological, developmental and morphological changes that occur in an encysted zoospore, that germinates by developing a germ tube that may penetrate the host directly or indirectly through an appressorium. An encysted zoospore is a zoospore which has shed its flagellum and whose membrane has fused to form a walled cyst. The host is defined as the larger of the organisms involved in a symbiotic interaction.
encysted zoospore germination on or near host