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Wanna-B/onsai
Join Date: Aug-2007
Location: Calgary
Country: Canada
Posts: 44
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Ortho's is not a systemic. Systemics are prohibited for general use in Alberta (where I live). Neither is Pyrethrin.
I've used Neem oil in the past with my other Elm and have had no ill effect. The problem was that the leaves were still quite young -- now that they've hardened I haven't had any problem with getting them wet.
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