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I would try Neem oil. I do not know how I
survived without this stuff. I use it as light oil and dormant oil.
For the past five years I spray any plant that comes in the house and I am bug
free all winter. Except about three winters ago: I was tied up with
other stuff and frost was threatening; I hauled everything in without their Neem
oil spray. I didn't think too much about it. I had HUGE infestations
of white fly, scale, and hatching blue bottle flies!! I spray the mulch on
the tops of the pots and soak the underside and stems. Ideally, I even try
to get 2 separate sprays in. This winter it didn't happen--only 1 spray;
so far no bugs. WHEW. Even this late I'd load a little one gallon
sprayer and do a 3/4 strength spray on all indoor stuff (with some
discretion on delicate stuff).
Michelle Horner
zone 4/5 SE WI
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