larva (pl. larvae) : juvenile ; growth stage between embryo and adult

latent : present but not manifested or visible, as a symptomless infection by a pathogen (for example a micro-organism)

latence : the time between contamination and differenciation of the first fructifications

mycelium (pl. mycelia) : mass of hyphae constituting the thallus, or body, of a fungus

microsclerotium (pl. microslerotia) :  microscopic, dense aggregate of darkly pigmented, thick-walled hyphal cells

mutation : heritable genetic change within a cell

nematicide : usually a chemical agent that kills or inhibits nematodes ; a pesticide

oogonium (pl. oogonia) : female gametangium structure of some oomycetes, containing one or more gametes

oospore : thick-walled, sexually derived (from antheridium and oogonium) resting spore of an oomycete (Pythium, Phytophthora...)

ostiole : round pore (opening) through which pycnidia and perithecia release their spores