pythiacystis

\\ˌpithēəˈsistə̇s\ noun

Usage: capitalized

Etymology: New Latin, from pythia- (from Pythium) + -cystis

in former classifications : a genus of fungi (family Pythiaceae) comprising a single species (P. citrophthora) that causes brown rot of citrus fruits and gummosis of citrus and other fruits and is now usually included in Phytophthora