Aphids! At present the aphids multiply - at all times during the current rainy season - again very strongly.
I crush / crush the aphids - no matter which - with a lot of feeling, so that the young shoots (the leaves) are not injured, with the fingers. If you dread it, rubber gloves are the best way to wear surgical gloves.
The aphids suffer less than when they are eaten by a lady beetle (ladybug).
Then I treat them by spraying with attached stinging water (about 10-14 days) or even if you are a smoker, with also (10-14 days) tobacco water. Just throw your smoked cigarette or cigar stubs into the water.
Good luck, it helped me!