Ditto here on all points. A neighbor offered me a powder for beetles; "Just sprinkle a little in the trench when you plant and they won't bother a bit." That means that it's in the plant, which we eat. Like the OP, potatoes are the big crop just a bit north of here. I get a lot of comments about how stupid it is to grow them when I can buy a 50 lb bag for $8.00... but when I grow them myself I know what chemicals were put on them. That's the same reason I raise chickens, turkeys, pigs, and laying hens... it isn't cheap but I know how they were treated , how they lived, and what they ate. They also taste a heck of a lot better... feedlot grown meat is just a medium for whatever spices and flavorings you put on them.Google "Colorado Potato Beetle Beater" or "Captain Jack's Dead Bug Brew". It's the best control for the larvae and can be used in organic gardens. It's worked fantastic for me, after trying many of the old standards (which are much more harmful to beneficial bugs) this is my only spray for potatoes, cabbage, tomatoes, brussels sprouts, broccoli.
What kind of manure? Generally it should age at least 6 months. Using Manure in the Home Garden, it's not recommended to use pig manure in a vegetable garden as it carries the same roundworms which cause trichinosis.The manure I have has been aged, but not by a year. About 3 months. Should I pile it up with my compost and wait until next spring?