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TOPIC: scyamore in Buffalo ny 200 YEARS OLD MIGHT DIE
http://groups.google.com/group/entstrees/browse_thread/thread/9f67fa1b39478254?hl=en
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== 1 of 2 ==
Date: Mon, Jun 23 2008 6:28 pm
From: Tree91@aol.com
The city of trees my lose its most famous Ent.Can anyone Help.?
http://www.buffalonews.com/cityregion/story/375708.html
== 2 of 2 ==
Date: Mon, Jun 23 2008 8:22 pm
From: "Edward Frank"
Hello,
The tree is likely suffering from Anthracnose. it is affecting
sycamores in north central Pa as well. It is because of a relatively
wet spring.
Here are photos of a couple of trees with the disease a few days
ago. The first is in Warren, PA. The second is growing adjacent and
overtowering a Sugar Maple in the Allegheny River Island Wilderness.
The trees will almost assuredly recover without any further action,
although the disease may cause multiple leaf drops in a given
season.
Edward Frank
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http://ohioline.osu.edu/hyg-fact/3000/3048.html
Sycamore Anthracnose. Pathogen: Apiognomonia veneta
This is a potentially serious disease of American sycamore and to a
lesser extent London planetree. Susceptibility of London planetree
varies considerably with seed source. Shoot blight, leaf blight and
twig and branch cankers and dieback can be severe. The fungus
overwinters on twig tissue on the tree with spores splashing to new
buds, shoots and leaves in the spring, with disease being enhanced
by cool, wet conditions during shoot and leaf development.
Considerable defoliation, sometimes with complete leaf loss, occurs
on many trees by late spring in some years.
Trees typically releaf by early to mid summer and are less
susceptible to continued infections because of warmer, drier
conditions. Also, as leaves age they become less susceptible to
infection. With repeated infections over the years, cankering of
twigs and branches can result in erratic shoot growth that gives an
overall distorted appearance to the tree, and also witches-brooming
where there are numerous side shoots that develop around a central
terminal shoot that was killed by the fungus. Fungicide applications
to prevent infections in the spring are sometimes warranted. If
fungicide is required, use a labeled material containing thiophanate-methyl,
chlorothalonil or mancozeb. Fungicide injections (which are made by
tree care professionals) are also used in spring and fall to
systemically control the disease.
http://www.na.fs.fed.us/Spfo/pubs/fidls/anthracnose_east/fidl-ae.htm
http://hgic.clemson.edu/factsheets/HGIC2011.htm
Anthracnose (Leaf and Twig Blight): The most important sycamore leaf
disease is anthracnose caused by the fungus Gnomonia platani (Discula
platani). This disease may appear as four distinct phases:
a.. Twig Blight: Occurs in the spring before leaf emergence, killing
tips of small, 1-year-old twigs.
b.. Bud Blight: Occurs in April and May; the expanding buds die
because of the girdling action of the canker on the branch.
c.. Shoot Blight: New shoots and immature leaves on infected
branches suddenly die.
d.. Leaf Blight: The most characteristic symptom is a crinkling and
browning of the leaves. Entire leaves may be killed and then fall.
These symptoms are very similar to those caused by late spring frost
injury.
This disease is favored by cool, wet weather (temperatures under 60
° F during budbreak and the first few weeks of growth). A severely
infected tree may be defoliated several times in a single season.
Small twigs and branches may be affected, and cankers may girdle and
eventually kill the branch. This will result in the production of
many small shoots from the area just below the girdled portion of
the branch, giving that part of the tree a bushy appearance. Spores
are spread by rain and wind to healthy leaves, buds and twigs. The
fungus survives the winter on fallen leaves and twigs...
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