[Image description: a two panel meme. In the top panel, a person labeled “my customers” asks the question “how do I keep bugs off my plants?” In the bottom panel, a person labeled “me, a native plant nursery owner” says “that’s the neat part, you don’t”]
Yeah they love the heck out of Rosaceae members for sure. If you’ve got the flies around, keep an eye out for a white dot on the heads of the beetles - that’s the sign that there is an egg which will hatch and parasitize them. The BT will go after them during their grub phase in the soil, which should make other control methods even more useful. A good rule of thumb for these live controls is to check for lot numbers and packaging dates, as less BT will survive the longer the package sits before use.