What is BT spray?

For budworms, you should spray your plants every 3 weeks with BT. :confused: [ info from a post/thread ]

I plan to grow outdoors again this year but need help with bud-worms. any help would make me a happy camper. I am new to this site I hope it can help out, I like to help out others when I can. other question I have is what is a good outdoor bug spray for the area, I want to kill all bugs that kill my weed. I want it to be bug free. if I can.
 
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