Bougainvillea with Leaf Damage in Circles

Q. I bought a Bougainvillea ('Barbara Karst') last April and planted it in my front yard. After digging the hole I added a local Rose and Flower food in the bottom of the hole. I then added water and then planted the Bougainvillea.

            This plant receives sunlight more than 6 hours every day and I water it as noted on the label. All went well until something started to carve big divots out of the leaves. I sprayed "Ortho Bug B Gone" as I was told and only sprayed it on the plant at night so it would not burn the leaves.

            Well it did the trick but the edges of the plant started to turn brown and shrivel up. As soon as new fresh, unsprayed tender leaves came out, the bug came back and started to carve out holes in the leaves again. Is there something I am doing wrong?