BW,
Those are plant sap sucking aphids. See below. Not my writing.
Control -
Spray With Water Physically removing the aphids from the leaves is the safest way to get rid of them and is a good place to start with organic aphid control. Okay, they are soft and squishy, but you don’t have to pick them off with your fingers. Instead, use a hard jet of spray from the hose. Be sure you hit the underside of leaves as well as the top, since the bugs often hang out there.
Dish Soap Mix You don’t have to buy commercial insecticidal soap to spray on your aphid-infested plants. Just mix up a cup of vegetable oil or a pint of water with two teaspoons of dish soap. Then spray it right on the bugs. Experts say that this works by removing the protective coating on the exterior of the aphids, resulting in them drying out quickly and dying. Remember though: only the aphids you hit directly with the mixture will be eliminated.
Neem Oil If you aren’t the “mix-it up yourself” type, pick up a spray bottle of
neem oil at the garden store.
Neem oil is made from seeds of the neem tree and contains several insecticidal and fungicidal chemical compounds. Different extracts are mixed with fatty acids and sold at garden centers as
neem oil. It kills aphids in the same manner dish soap and water does, so direct contact with the bugs is necessary. The oil helps to smother them.