I have a peach and a plum tree. Both are doing well, but the leaves are showing signs of being eaten by "something". I can find no actual pest, such as caterpillars or aphids, on the tree itself. The holes are small and plentiful in the leaves - lots of little bites. Today I found a ladybug on my peach tree - not sure if that's a sign of aphids? I have applied BTK once this year, since last year we found a couple of caterpillars. But the holes seems to persist, and i'm reluctant to keep applying when there is no actual evidence of caterpillars. (I live in the lower mainland.) Any help would be appreciated!