Here's a link to an article where honey bees were used as a vector for Btk vs the Banded Sunflower Moth. It looks like they built a reverse pollen trap so that the bees could carry the Btk to the sunflowers.
1. For the brassicas; cabbage, broccoli, cauliflower etc, nothing beats row covers.
2. For horn worms, try companion planting with basil and borage amongst your tomatoes.
3. For squash bugs, plant onions in your squash hills.
The only other pests we have to really worry about are Colorado potato beetles. Those we handpick and feed to the chickens.
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