Re: Verticillium

Verticillium fungi can survive in the soil for many, many years in decaying organic matter. Their attack on smaller plants and young trees is usually lethal, but mature trees can deal with it for a long time, even though the fungus will cause the die-back of several branches in the spring. This is typical of old olive trees infected with Verticillium. The only way to get rid of Verticilium is by very agressive chemical treatment of the soil (that I wouldn't recommend). So basicly, every time we plant something new in our yard there is a chance that it will be hit by Verticillium.

Fran
Madrid, Spain


----- Original Message ----- From: "dnjperson" <dnjperson@comcast.net>
To: "medit-plants" <medit-plants@ucdavis.edu>
Cc: "dnjperson" <dnjperson@comcast.net>
Sent: Monday, August 01, 2005 2:43 AM
Subject: Re:


Barbara,

We've had a species maple with verticillium wilt for almost twenty years. We have cut off dead branches as they occur, fully expecting to lose the whole tree at any time, but we haven't had any dieback the last two years. It's a mystery, but we still have a nice big Japanese maple.

Judy Person
On Jul 31, 2005, at 7:56 AM, barbara sargent wrote:

Cheryl said:
Actually, Japanese maples are listed as being resistant to Armillaria (oak
root fungus). I think it's more likely verticillium wilt, which affects
Japanese maples in exactly the way you describe. If you cut off the dying
branch, do you see dark streaks under the bark? That's an indication of
verticillium.
Cheryl,

If it is verticillium wilt is there anything that can be done to save the
rest of the tree?  I haven't checked for the streaks yet.

Barbara















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