yes they do
yes.
A few I know of are aphids, mealy bugs, and cicadas
No, but they are a real pest of plants.
You never totally rid African Violets of mealy bugs. For bad infestation take plant out of pot trim most of roots off rinse off and, replant in a clean pot. Go to garden center get soil mealy but pesticide.
A mealybug is attracted by moist and wet climates. If you have a basement that is warm and gets wet regularly, they might make their basement their home.
I have no idea what mealy bug worms are but old-fashioned mothballs are not recommended - the ones made from naphthalene. But you can use one of the fly/moth killer strips that are impregnated with dichlovos if you are in the US. (They are illegal in the EU). I have also used pyrethrum powder or even malathion powder placed under some newspaper that you then stand the seed on.
Mealy bugs, slugs, scale and snails can bother your sedum. Bees will pollinate it.
Yes it will but it's a long process and chances are you kill them all. It's better to spray them. Neem Oil or ask you nurserymen what to use.
Sugarberry is another name for hackberry which is a tree in the southeast US. The berries secrete a sweet sticky substance in the autumn that attracts gazillions of mealy-bugs. The mealy-bugs gorge themselves with the secretions and produce a dew-like substance of saccharine sweetness known as ghost rain. Many songbirds eat the sweetish fruits and help disperse the seeds.
Ladybugs do eat yellow jacket larvae. They also help to take care of other pests such as mealy bugs, aphids, leafhoppers, and other crop-destroying bugs.
Tiny black bugs that live on the human scalp could be mites or head lice. Both mites and head lice are parasites that use the human as a host.