This verse repeats, in a briefer form, the warning of verse 38.
The fruit of your ground: “the crops” (see verse 11).
The locust shall possess: that is, “the locusts will destroy.”
Quoted with permission from Bratcher, Robert G. and Hatton, Howard A. A Handbook on Deuteronomy. (UBS Helps for Translators). New York: UBS, 2000. For this and other handbooks for translators see here .