phytophagic
/ˌfʌɪtəʊˈfadʒɪk/Chiefly Entomology
adjective
1Designating or relating to a variety of insect distinguished by features associated with its use of a specific host plant as a food source. Now historical.
2 Generally. Feeding on plants or plant material; phytophagous.
Origin
Mid 19th century; earliest use found in Benjamin Walsh (1808–1869). From phyto- + -phagic.