While several sites about the Spruce Budworm list predators such as spiders, insects, and many species of birds I've not seen any mention of Lady Beetles and their larva. If Spruce Budworm is a problem an insectary would help attract several species of insect predators, including those Lady Beetles.

If the Budworms are a large problem or control needs to be done before the insectary can be effective careful applications of Bacillus thurengiensis - Kurstaki may be of some help.

How many trees, what size? Are you interested only in organic control measures?

I agree that ladybugs are not the way to go.

I live in a spruce forest basically, so hundreds of trees, only ones I'd like to help are around perimeter of yard.

im not against chemicals if used correctly, but would prefer less toxic choice if it is as effective.

I'm leaning big towards bt, but they only sell 100ml concentrate here for $11, might get pretty pricey to mix up much quantity.

winder if there's a home brew recipe like dish soap and cayenne or something like that, what did they spay in the old days prior to commercial sprays?

Insecticidal Soaps are contact poisons, so you need to be sure you spray the target insect. Insecticidal Soaps have no residual affects like the BtK does.