Hi – I am reading your information about eliminating Wooly Adelgid. I have 3 hemlock trees about 15' tall that now all have this pest. They have been in for about 5 years and now have the aphids.
From what I see in the ADELGID article, it looks like the best non-toxic way to get rid of them is by using a combination of Concern Multipurpose Insect Killer and Bug Patrol RTS. Is this correct? How often do I have to apply each one? Additionally, do you think that aphid traps or aphid alarm would help?
Initially I recommend a followup treatment one week after the initial application. And after the second application, wait 2 weeks to see what happens. If they come back sooner, treat sooner. The organic options won't last like the BIFEN we have listed in our article but they do work.
Now once you can go a full month without them returning, I suggest setting out some APHID ALARMS on any of the hemlocks and surrounding plants you want to protect from future infestations. These really work but should only be deployed after you eliminate the current infestation. In the long run the alarms will cut back dramatically on how much spraying you'll have to do so they're well worth installing.
Here are direct links to the information and products listed above:
Organic Insect Killer: http://www.bugspraycart.com/organic/liquid/multi-purpose-insect-killer-24-oz