They look like scale insects, you should spray with /, just be careful not to spray when it's hot out you can injure the plants. Horticultural oil:https://www.amazon.com/Bonide-All-Season-Horticultural-Spray/dp/B000BPC21Y/ref=sr_1_4?dchild=1&keywords=horticultural+oil&qid=1595994316&sr=8-4