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Re: arborvites

Re : arborvites -- karen
Posted by saccharum , Jun 11,2005,02:46    Top of Thread   Forum

Arborvitaes and related trees (especially Leyland cypress) are prone to a fungal disease called Cercosporidium blight, which causes the symptoms you're describing (death from the bottom-up). If you have irrigation, make sure that it's not hitting the foliage at the bottom of the tree when it runs (this will promote foliar fungus problems on many species). You can control the spread using frequent applications of a copper-containing fungicide during wet weather, but I'm afraid it's something of a losing battle.

The columnar growth form is probably a characteristic of the variety you've planted, in which case there's not much you can do to alter it.

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