Dutch Elm Disease Resistance CVs

Matthew Weinert M.Weinert at tpp.uq.edu.au
Sun Aug 6 18:44:52 EST 1995


In article <3vut16$dip at newsbf02.news.aol.com>, milmarple at aol.com (Milmarple) says:
>
>Stephen:  I'm no expert, but do know that DED has rendered American elms
>unsuitable for planting at least in the Southeastern United States for the
>last several decades.  It can strike at any age and is sited in the
>vascular system.  This means that we are completely helpless in fighting
>the disease.  There have been "shots" that some folks have sold to
>unsuspecting elm owners, but they are ineffective as far as I know and
>involve drilling holes in the trunk (ie inflicting further injury).
>
>Once an elm contracts DED, it dies generally in 1-5 years depending on the
>tree's health at onset and subsequent environmental conditions.  The
>symptom with which I am familiar is sudden browning of the leaves on
>branches.  The necrosis will move down the branch from the tip.  You
>should consider locating an American plant pathologist in an Eastern state
>(perhaps Morton Arboretum, Cornell University or Pennsylvania State
>University).  You might also see if you can talk to someone from the
>United States Department of Agriculture/Forestry Division.
>
>The good news:  American Elm substitutes that are not susceptible to DED
>have come into use in horticulture.  Among the best is Zelkova serrata,
>the Japanese Zelkova.  Another is Ulmus parvifolia, Chinese Elm or
>Lacebark Elm, which Dr. Michael Dirr (University of Georgia, USA) lists as
>showing "considerable resistance" to DED.  He puts U. parvifolia ahead of
>Z. serrata in resistance to the disease.   Dr. Ken Tilt  (Auburn
>University, Alabama, USA) toured cemetaries a couple of years ago to look
>at trees of varying species that survived such a mow-only environment.  He
>found several large, magnificent elms and may know something about the
>rumblings that the American Elm is making a comeback.  I think his address
>is ktilt at aces.auburn.edu.  If that's not right, e-mail me at bbsed at aol.com
>and I'll try to get it for you.
>
>Good luck,
>Sandra Smith Williams
>Director of Education
>Birmingham, Alabama, USA

Be careful with plantings of Chinese elms. In some parts of Australia these
trees are becoming a mojor weed problem. The tree has nice berries which 
attract birds, thus spreading them widely. Apart from being resistant
to DED they appear to be resistant to almost anything. Beware

Matt



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