Question
We planted four (4) knockout roses last fall.  Two are doing okay and two are having difficulty.  They are losing their leaves; kinda looks like something has eaten the leaves...???  I live in the Atlanta area.

Answer
If the leaves are completely taken off, it could be an animal such as squirrels, rabbits etc But if they are badly eaten then I would use an insecticide spray for rose insects to discourage the bugs. The rose leaves will grow back so loss of leaves does not kill a rose.