They come off when rubbed (although not all of them) and are slightly waxy but I don't think it is honeydew, mildew or whitefly?
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These are aphids and as they grow they moult and leave husks behind. That is the whitish things on the leaves. I have annotated your picture and outlined in red the aphids that are green in color.
Control is easy with soap and water, applied at 5 ml per litre, and repeated at least three times at five to six day intervals. Leave the soltion on for a few minutes then rinse with water. Soap kills aphids, whitefly and mist soft bodied insects but you need to repeat the treatment.
Continue to check for pests as adults have wings and can fly from other plants nearby.
kevinskio
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It might be a good idea to create homes for ladybugs, like piles dry leaves. That would tempt then to stick around. Give them food and shelter, and even if they fly away to mate, they will come back to eat and sleep, sort of like young human adults. You probably won’t end up doing their laundry, though. That’s a plus.
susanabra
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