ייִדישער מחשבֿה אויף דברים 28:38

Locusts corresponded to "Let the earth sprout... fruit trees producing fruit," for the locusts were a destruction of this statement specifically, for locusts are more capable than any other insect in destroying fruit as is written (Devarim 28:38), "The field will produce much seed, but you will gather little for the locusts will consume it," and it also says, "All your trees and fruit of your land will be inherited by locusts." From here you see that Locust are specific in their ability to destroy tree and fruit. Even though the hail also struck the trees of the field, it wasn't specific to the trees of the field for it also struck animals and people. But the locusts were specific to the trees and fruit.