On Sun, 15 Mar 2015, "David E. Ross" wrote:

On 3/15/2015 11:24 AM, Jenn wrote:
My husband has a couple of citrus trees in his green house, and they are
covered with scale insect. How does he get rid of the nasty things?

Long-term protection can be obtained with a soil drench containing
Imidacloprid. Although it is not approved for use on edibles, research
indicates it is harmless to mammals and birds. However, do not use it
during or prior to blooming since it is quite toxic to bees. If
blooming is expected within the next two months, I would wait.

I doubt Jenn's husband has bees in his green house, but possibly he has a
hive in there.

Don. www.donwiss.com (e-mail link at home page bottom).