RE: [AZ] Please help - blight on my bushes
Yes, the photo of the bark scale is exactly it, thanks.
Thanks for asking us.
Take a close look at the crotches of the stems for little white
patches. If you see some, and you scratch them with a fingernail and
they show red inside, you may have "azalea bark scale" You can see
pictures of that at
If you see that on your plants, an insecticide called Merit with the
active ingredient imidacloprid applied at any time will kill them
(after a month or so, as it is a systemic insecticide that must first
be absorbed by the plant). If you can see some tiny bright red spots
on the stems - it might take a 10X hand lens to see them - those are
the "crawlers" that can be killed by washing them off with a high
volume, high pressure water spray, or by spraying with insecticidal
soap or malathion (if you can't see them, they are inside those white
patches and won't be harmed, so there is no point in spraying until
they come out and you can see them).
Bob Stelloh Hendersonville NC USDA Zone 7
On May 16, 2013, at 7:24 AM, Tricia Cook wrote:
> Just noticed 4 of my azalea bushes (different colors) have got
> blackened stems, branches, and no flowers are forming. What can I
> do to save them and not have the others infected ? Please help,
> thank you.
> Long Island, NY Zone 5
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2013.0.3336 / Virus Database: 3162/6331 - Release Date: 05/17/13