Diatrype disciformis (Hoffm.) Fr.
Diatrype disciformis (Hoffm.) Fr.
Diatrype disciformis (Hoffm.) Fr.
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Plant Disease Lessons: http://www.apsnet.org/Education/LessonsPlantPath/DutchElm/top.htm<br />
As early as June, the leaves on a DED-infected elm<br />
will wilt, turn yellow, then curl and turn brown.<br />
Symptoms usually first appear in the crown on the<br />
tree, and can be seen until fall colours appear.<br />
Dutch elm disease is spread by the native elm bark<br />
beetle which can fly up to 2 km as it searches for<br />
healthy elms to feed on. The DED fungus has sticky<br />
spores that become attached to the beetle during<br />
its breeding period. The beetle then spreads the<br />
fungus when it feeds on and over-winters in healthy<br />
elms.<br />
Do not prune your elms between April 13th and July<br />
31st. The Elm Bark Beetle that spreads the DED<br />
fungus is attracted to freshly cut elm and is most<br />
active during this period.<br />
http://www.sdeda.ca/what_is.html<br />
http://www.fs.fed.us/na/morgantown/fhp/palerts/ded/elm.htm
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