I have smitten you with blasting and mildew - He sent blasting and mildew on the crops, and the locust on the gardens, vineyards, and fields; and this in such a way as to show it was a Divine judgment. They saw this; "yet they did not return to the Lord!"
I have smitten you with blasting - Literally, “an exceeding scorching,” such as the hot east wind produced, and “an exceeding mildew,” a blight, in which the ears turn untimely a pale yellow, and have no grain. Both words are doubly intensive. They stand together in the prophecy of Moses Deuteronomy 28:22, among the other scourges of disobedience; and the mention of these would awaken, in those who would hear, the memory of a long train of other warnings and other judgments.
When your gardens increased - Better, as English margin. “the multitude of your gardens.” The garden of the east united the orchard Job 8:16; Deuteronomy 11:10; Amos 9:14; Jeremiah 29:5, Jeremiah 29:28. Its trees Ecclesiastes 2:6, as well as the garden (Psalm 1:3; Jeremiah 17:8; add Isaiah 58:11; Jeremiah 31:12, contrariwise Isaiah 1:30), was an image of abiding freshness and fertility, Yet neither would these escape God‘s sentence. On these He sent the locusts, which, in a few hours - all leaves - flower, herb or tree, are as dead (see the note at Joel 1:7).