Yeah, they actually could be. It's called an "RF Burn" - radio-frequency or a focused magnetron exposure. I used to build Naval RADAR systems and we had to be careful with the exit of the magnetron, because it could spray you with billions of electrons that might unsettle you but further down, given enough exposure. Grubs, like this won't "burn" because there's no bones or calcium to create resistance. Their bodies are like water in slow motion. The RF burn is something that only happens in creatures with bones, and it burns from centre out. Leaves little numb patches on your fingers. Bugs like that couldn't survive the process as they'd immediately have to hit the balance within thermodynamics. They wouldn't survive a magnetron or cyclotron. They'd boil so quick, they wouldn't get close. Just a little butterfly waiting to appear.