Beetle, fungus deliver one-two punch to black walnut trees

(PhysOrg.com) -- A newly discovered disease, caused by a previously undescribed fungus hitchhiking on a tiny native bark beetle, is infecting and killing hundreds of black walnut trees in California and seven other Western states.

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<p><a href="http://www.physorg.com/news166376272.html">Beetle, fungus deliver one-two punch to black walnut trees</a></p> <p>(PhysOrg.com) -- A newly discovered disease, caused by a previously undescribed fungus hitchhiking on a tiny native bark beetle, is infecting and killing hundreds of black walnut trees in California and seven other Western states.</p>