Bayer Advanced Tree and Shrub for Emerald Ash Borers
I have a mature, White Ash, tree (~DBH 120") that has been home treated with Bayer Advance Tree and Shrub (every Spring) to re-mediate significant Emerald Ash Borer (EAB), pressure. This Spring I applied liquid and granular applications of the Bayer product and fertilized the drip line with 10-10-10. Also, tree has just been (heavily) pruned by an Arborist. I would like to request your advice about applying, Orthene ("Acecaps 75") this growing season to re-mediate for the future. Does your office have practical experience that it would be willing to share about efficacy? What course-of-action, would the Co-operative Extension advise to proof for EAB pressure and assist in the recovery of the Ash tree for subsequent seasons? Thanks.
Baltimore County Maryland
Instead of the Acecaps, we recommend using a systemic treatment of emamectin benzoate (Tree-age). It provides up to two years of control, whereas the Acecaps is good for one year. This guide provides the current best options for landscape professions to use in the treatment of emerald ash borer.
Pesticides containing imidacloprid or dinotefuran are no longer allowed for homeowners to apply to external landscapes, as per Maryland's Pollinator Protection Act, which when into effect in January 2018. You would have to hire a certified pesticide applicator to these treatments.
You can find additional information here on our website.
The Homeowner's Guide to Emerald Ash Borer is a good resource for determining if it's a good decision to try to treat an ash tree (based on the amount of canopy dieback) and when to apply treatment. This guide is somewhat dated in that it lists imidacloprid and dinotefuran as options for homeowners to apply themselves, and that is not the case now. http://dnr.maryland.gov/forests/Documents/EmeraldAshBorer_HomeownersGuide.pdf