Charles Ellicott Commentary Amos 4:9

"I have smitten you with blasting and mildew: the multitude of your gardens and your vineyards and your fig-trees and your olive-trees hath the palmer-worm devoured: yet have ye not returned unto me, saith Jehovah." — Amos 4:9 (ASV)

Blasting and mildew—Burning up the corn before it is ready to ear, and producing a tawny yellow, instead of golden red, was another judgment. Nothing escapes the Divine visitation. Your gardens, vineyards, fig-trees, and olive-trees—which in a well-watered enclosure might escape the general drought—the locust devours in vast numbers (so the Hebrew should be rendered); Compare to Joel 1:4.