I would like to protect our ailing oak from further bark beetle damage. Can I spray the trunk once per month in the dry season, May – October? I’d guess they would only come in contact with it when they land or when they emerge (which is too late). Is there a better product, perhaps more of a repellent?
Unfortunately, Demon WP is not labeled for bark beetles. We would recommend a product like Tengard SFR One-Shot Termiticide. Per the product label to prevent an infestation to trees and woody ornamentals, you would thoroughly spray the bark but not to the point of runoff.