There are several other insects that will do this type of damage and some like thrips are too small to be seen. Use BT or Bacillius thuringiensis as a spray being sure to aim at the undersides of the leaves. If the plants are severely damaged such as more than half of the foliage is gone resort to a pyrthrum spray. In the fall clean up all fallen leaves so the invaders cannot reinfect the plants. Keep growing, Marianne Binetti