these black spots mainly appear on the main cola fan leaves of my purps plant(sativa). So far there's not a ton, but it has me worried. I have had to pull 6 or 7 caterpillars off since she was born. They were super small green and white caterpillars with black stripes down their backs. I have no clue if that is related tho. I use a pesticide that is approved for tomatoes and edible vegetation(this could also be the cause??). I also added vegetation nutrients to the soil about a month ago. any help much appreciated