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United States Department of Agriculture

Agricultural Research Service

Title: Bark Canker of Unknown Etiology Developing on Pecan Carya Illinoensis Trees

Authors
item Reilly, Charles
item Wood, Bruce
item Hotchkiss, Michael

Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: April 1, 2003
Publication Date: May 15, 2003
Citation: Reilly, C.C., Wood, B.W., Hotchkiss, M.W. 2003. Bark canker of unknown etiology developing on pecan carya illinoensis trees. Phytopathology. 93:73. Abstract.

Technical Abstract: Pecan trees in a five-year-old orchard of 17 cultivars had symptoms of an unusual bark canker first noticed in October, 2002. Symptoms appeared from ground line up to 3 meters on the central leader and most likely were initiated during the summer of 2002. Cankers developed around buds of the trunk and central leader and were redbrown, about 2cm x 4cm, ovoid and devoid of chlorophyll. The cankers expanded and coalesced, primarily on the southwest side, but some also on the northern side of the tree. Vertical cracking of the cankered bark was increasingly evident as tree diameter increased. Affected bark, 2-3 mm thick, peeled back and dropped leaving a light gray area of under bark which did not appear to be damaged. Fungi associated with twig and limb dieback were detected in the necrotic tissue but not in healthy tissue.

Last Modified: 10/21/2014
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