IPA: /ˌɛpɪfaɪˈtɒtɪk/
KK: /ɪˌpɪfɪˈtɑtɪk/
Relating to a sudden and widespread outbreak of a plant disease that can affect many plants over a large area.
The epiphytotic spread of the disease devastated the local crops.
Epiphytotic → It is formed from "epi-" (meaning upon or above), "phyton" (from Greek, meaning plant), and "-otic" (a suffix used in biology to denote a condition). The word describes a condition affecting plants that grow upon other plants, particularly in a widespread manner.
Think of plants growing 'upon' ('epi-') other plants ('phyton') — that's why epiphytotic refers to a condition affecting such plants.