@fedipete @runderful_ryan they are some kind of scale insect. The ants hanging around are an indicator because they like to eat the honeydew (waste) that the scale bugs create. You can spray the leaves with insecticidal soap (buy it premade or make some from Castile soap and water). You can also use a neem oil emulsion. The idea is that since they breathe through their skin the liquid clings to them and suffocates them. That often works but doesn't always. But it's a good start