The active ingredient is imidacloprid and it IS effective against
rhododendron or azalea scale. Ask for it by the chemical name or you could
look for it under a couple of other tradenames: Marathon, Admire, Premier,
or Premise. It is general use pesticide so larger garden centers should
carry it or you might be able to order it online. Be sure you read the label
carefully and apply according to directions. You can also try swabbing the
insects directly now with isopropyl alcohol.

pam - gardengal


"Twobtold" wrote in message
...
Hi --
I've been informed by a landscaper to apply Merit granules in the
spring
to combat scale that is attacking my shrubs (Rhododendron and Andromeda,
top
branches are turning black).
Doing a Google search shows Merit Systemic Insecticide Granules used
to
control grubs in lawns.
My questions: Is Merit the right thing to apply? Where can I buy it if
it
is appropriate? I went to Home Depot and they do not have it. Local
nursery
does not carry it either.
TIA for any/all input. (Z6,NJ)