Hey Growmie,
Looks like your dealing with an aphid problem. Neem oil, insecticidal soaps, and horticultural oils are effective against aphids. Be sure to follow the application instructions provided on the packaging. You can often get rid of aphids by wiping or spraying the leaves of the plant with a mild solution of water and a few drops of dish soap. Hopefully, I answered your question and remember "Happy Growing" and "Free your mind one puff at a time"