phytopathology
noun
phy·to·pa·thol·o·gy ˌfī-tō-pə-ˈthä-lə-jē 
-pa-
: plant pathology
phytopathological
ˌfī-tō-ˌpa-thə-ˈlä-ji-kəl
adjective 
Word History
Etymology
phyto- + pathology, probably after French phytopathologie or German Phytopathologie
First Known Use
circa 1859, in the meaning defined above
Medical Definition
phytopathology
noun
phy·to·pa·thol·o·gy -pə-ˈthäl-ə-jē, -pa-
plural phytopathologies
: plant pathology