Answer: Unfortunately, based on your description it's impossible to make a definite identification, but I suspect they are aphids. Aphids are soft bodied sucking insects and are fairly easy to control. Since this is a plant you are going to eat, you need to be careful about what you use to control them, whatever they may be. The first and one of the most effective approaches is hand pick them and then wash the leaves under a strong stream of water. This can be repeated as needed but twice a week would probably be about right. Another approach, if these are aphids, would be to use insecticidal soap being sure to carefully follow the label instructions. Good luck with your parsley!
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