Why did God send locusts after the plague of hail?

To eat the crops of the ancient egyptians so they would starve, mind this is just a story though. A religious icon in somes mind but the likelyhood of another plague is questionable due to recent advances in technology.

Jewish answer:

Jewish tradition (and the Torah) state that the plagues were real events. Remarkably, an ancient document (the Ipuwer papyrus) mentions "the river turned to blood" and other Biblical parallels.

To answer the question, the locusts ate whatever vegetation had survived the plague of hail