Increased — When they were most fruitful. Devoured — Eat up all, as is the manner of them.
Related Commentaries of Amos 4:9
Amos 4:9
9 I have smitten you with blasting and mildew: when your gardens and your vineyards and your fig trees and your olive trees increased, the palmerworm devoured them: yet have ye not returned unto me, saith the LORD.