I have black flies all over my 3 potted plants. They seem to be interested in the flowering portion of the calibrocchoa. The whole plant is under attack!
This can be solved in many ways, and they methods will not harm your plants at all! My favorite methods for insect control as follows: Garlic oil, lavender oil, neem oil, rosemary oil, and on occasion, for tougher insects... cinnamon oil. You can mix one or more of these in a spray bottle with a few drops of each in warm water, and a spoonful of coconut oil.