During the Vietnam war, the American army used napalm to defoliate the jungle.
de (not, do the opposite of, undo)#folium (leaf) (Latin)
de+FALL+ATE: u make the leaves to fall, and eat them. thereby depriving of leaves. !!! de (without, not having) + folio (folios. green leaves). excessive use of chemicals can destroy the greenness of leaves.