דברים ז:כ פירוש: רש״י, רבנו בחיי וחזקוני

הצרעה — a species of flying insect which injected poison into them, and castrated them and blinded their eyes wherever they hid themselves (Sotah 36a).

הצרעה, “the hornet;” according to some interpretations this is a type of disease similar to tzoraat, afflicting the body. (Ibn Ezra)