phytopathologist

Etymology tree
Proto-Indo-European *bʰuH-
Proto-Indo-European *-yéti
Proto-Indo-European *bʰuHyéti
Ancient Greek φύω (phúō)
Ancient Greek φῠτόν (phŭtón)der.
English phyto-
Ancient Greek πάσχω (páskhō)der.
Ancient Greek πᾰ́θος (pắthos)
Ancient Greek -λογῐ́ᾱ (-logĭ́ā)bor.
Latin -logialbor.
French -logie
French pathologiebor.
English pathology
Proto-Indo-European *-id-
Proto-Indo-European *-yéti
Proto-Indo-European *-idyéti
Proto-Hellenic *-íďďō
Ancient Greek -ῐ́ζω (-ĭ́zō)
Proto-Hellenic *-tās
Ancient Greek -τής (-tḗs)
Ancient Greek -ῐστής (-ĭstḗs)bor.
Latin -istader.
Old French -istebor.
Middle English -ist
English -ist
English pathologist
English phytopathologist
From phyto- + pathologist.