Mildew
Mildew appears in scripture as one of the agricultural blights Yahweh sends against a land that has broken covenant. It is consistently paired with "blasting" — the two together name the wind-borne and fungal failures that ruin grain, vine, fig, and olive — and it stands alongside drought, locusts, and pestilence in the catalog of covenant-curses.
A Covenant Curse
The Deuteronomy curses list mildew among the bodily and agricultural afflictions that pursue a disobedient Israel: "[The Speech of] Yahweh will strike you with consumption, and with fever, and with inflammation, and with fiery heat, and with drought, and with blasting, and with mildew; and they will pursue you until you perish" (Deu 28:22). Solomon's dedication of the temple repeats the same vocabulary in petitionary form, asking that prayer toward the house be heard "if there is in the land famine, if there is pestilence, if there is blasting [or] mildew, locust [or] caterpillar" (1Ki 8:37). The same agricultural disasters that signal the curse are the disasters from which the temple becomes a place of intercession.
Strike on the Crops
In the prophets the strike has already fallen and is read backward as a summons to return. Amos enumerates: "I have struck you⁺ with blasting and mildew: the multitude of your⁺ gardens and your⁺ vineyards and your⁺ fig trees and your⁺ olive trees has the palmer-worm devoured: yet you⁺ have not returned to me, says Yahweh" (Amos 4:9). Haggai delivers the same logic to the post-exilic community: "I struck you⁺ with blasting and with mildew and with hail in all the work of your⁺ hands; yet you⁺ did not [turn] to me, says Yahweh" (Hag 2:17). In both prophets the blight is a divine action ("I have struck"), aimed at the return of the people, and in both prophets the people fail to read it.