IPA: /ˌfaɪtəˌpæθəˈpoʊdʒɪk/
KK: /faɪtəˌpæθəˈpoʊdʒɪk/
Relating to organisms that cause diseases in plants.
The phytopathogenic fungi can severely damage crops.
Phytopathogenic → It is formed from "phyto-" (from Greek "phyton", meaning plant) and "pathogenic" (from Greek "pathos", meaning disease, and "genes", meaning born of or produced by). The word describes something that causes disease in plants.
Think of 'phyto-' meaning plant and 'pathogenic' relating to disease — together, they describe something that causes disease in plants.