I've been treating hemlocks with pretty good success for the past 12 years, but I'm trying to make an honest effort to switch over my entire PHC business to 90-100% organic and sustainable treatments and programs. I'm in the beginning stages of doing 2 hort oil treatments a year on hemlocks. I'm curious if anyone else is trying similar treatments and what sort of results they're getting. What sort of timing as well? My regime so far has been early spring (March/April) and later summer-fall at a 2% rate. I may consider raising the rate to 3-4% as I have had zero phytotoxicity issues. Another option was to try Acelyprn (it's not organic, but it's about as low toxicity as you can get, plus there are no pollinator issues like with Merit or Safari). Has anyone else tried Acelypryn for Adelgid or anything else?