A 2003 infestation of Mormon Crickets caused more than $25 million in lost crops. The crickets came in such numbers that people couldn’t so much as take a step without finding one underfoot. The grasshopper-like insect, named for attacking the crops of the Utah pioneers in 1848, can eat an astounding thirty-eight pounds of plant material in their lifetimes, despite being merely two to three inches long. The impact of infestations on famers’ livelihoods—and the overall economy of a state or country—can be devastating.

The Old Testament prophet, Joel, described a horde of similar insects ravaging the entire nation of Judah…