Safari (valent) has good results for scale and can be applied as a basal drench. Application that does not require tree wounding is obviously preferred if possible. PM me if you are interested in where you can purchase Safari.
Thanks fellas for the input.
The powers that be want to use a locally obtained brand called TRI-STAR as a basal drench systemic for the control of the hardscale issue on the mature oaks. I want to use the SAFARI Mr. Jedi. recommends as I can readily find information supporting the use as a basal drench, yet for TRI-STAR I can only find efficacy reports on the chemical applied as a crown spray.
After researching all five of the available neonicotinoids including Marathon(imidacloprid), Flagship (thiamethoxam), TriStar(acetamiprid), Celero (clothianidin), and Safari(dinotefuran) I feel SAFARI may be the way to go.
Can you guys lead me to a reputable and non-biased report supporting the use of any of TRI-STAR as a basal drench to control hardscale on mature oaks?
I would like to put this question to rest, perform the treatment and send the bill. Thanks again, everyone. .ed