A plague of locusts

Exodus 10:15 English Standard Version (ESV)

15 They covered the face of the whole land, so that the land was darkened, andthey ate all the plants in the land and all the fruit of the trees that the hail had left. Not a green thing remained, neither tree nor plant of the field, through all the land of Egypt.

"They ate every green thing, the garden, the grass, the leaves on the trees.  Our chickens ate grasshoppers until they would eat no more.  The fish in the creek ate all they could hold.  Everywhere we stepped we mashed grasshoppers and they crawled up under our skirts and down the backs of our necks." 

-- Laura Ingalls Wilder, Pioneer Girl: The Annotated Autobiography (Pierre: South Dakota Historical Society Press, 2014), 79.