The tomato hornworm shown here is clearly the bad bug. If you like tomatoes. It destroys tomato plants leaf by leaf. The white protrusions on its back are egg sacs of a parasitic wasp, the good bug. At this point, the hornworm’s fate is decided but we resist the urge to squash or otherwise remove the hornworm prematurely from the plant and planet. The hornworm is now a beneficial to the garden. acting as an incubator for the next generation of parasitic wasps. Thank you virtuous cycle.