A:Bt is one of the oldest bacteria used to control insect problems naturally. What u need to do is first cut ALL of the dead or the 'diseased' branches. Then u need to inspect for ANY worms or insects. Then u spray. i suggest feeding it plant food and then giving it a lot of water. Yes u should spray through summer and in fall and at the end of winter. heres my email if u have trouble. nickym16@yahoo.com
