The first picture is of one of the funny stone fruit Aphids. Look at aphids of peaches, plumbs, cherries from local state extension. If it is a small infestation below economic risk, ladybug, lace wing nymphs aka aphid Lyons. In areas with higher concentration use an insecticidal soup. Know the pH of your water and buffering. You want to between 6.5 and 7 for soap otherwise the soap curdles and is less than useless. Use soap only in areas with high economic risk. The rest of the areas grade from zero to 5 by square meters, the good bugs are calculated at number score times the desired good bugs need on release. There is a more complex version of the basic formula that is a bug volume calculation. I would have to look up the details. It is the same basic calculation as a tree volume spray calculation, but for bugs. Tomato growers use the volume calculation more accurate bug releases and to calculate bee requirements.
The white spotting adds to my guess. It looks like powdery mildew. Scratch it with a single edge raiser. If it comes off in dusty flakes, it’s powdery mildew. Once you have powder mildew the damage is already done. You can try to control it, but it’s a bit like tilting at windmills. Clean away affected leaves, despose of away from the growing area.
Big explosions of aphids are often symptoms of a more fundamental problem.
From the voices in my head