they are very harmful.
The Emperor gum moth can not feed so it will not be harmful if it's mouth parts are to weak to even consume food!
If you need help I recommend you type in the specific question you need help with
luna moth's are not helpful
it can be helpful or harmful
sometimes they are helpful and harmful.
Bacteria can be both harmful and helpful
Sandpaper is both helpful and harmful.
Atlas moths are very helpful, they play an important role in commerce. Atlas moths are used for the brown strands of silk they excrete and in places like Taiwan, their cocoons are used to make purses.
they are helpful not harmful to plants
harmful
Depends on what part of "harmful" or "helpful" you are referring to.
helpful