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EXTENSION SERVICE <br /> Lane County Office <br /> MEMORANDUM <br /> November 4, 1994 <br /> TO: Jan Staszewski, Urban Forester <br /> City of Eugene, Public Works <br /> FROM: Mari Kramer, Program Assistant, Forestry <br /> y77lr_,ac - //-/1_7zi —' <br /> SUBJECT: Health of the Incense Cedars in the South <br /> West Park Block <br /> V <br /> On Tuesday, November 1, I visited the Park on East 8th <br /> Avenue and Oak Street to examine the health of the <br /> Incense Cedars. <br /> OREGON Upon cursory investigation, I noted evidence of Pocket <br /> STATE Dry Rot, Oligoporus amarus. This type of rot is a <br /> UNIVERSITY brown cubical pocket rot of the heartwood of living <br /> incense cedars. <br /> Two trees have the Oligoporus amarus conks. This <br /> 950 West 13 Avenue indicates extensive rot. Usually one conk is produced <br /> Eugene, Oregon and then only on trees with extensive rot. Conks <br /> 97402.3999 appear annually - and only in late summer and fall. <br /> Eaten by insects, they may be destroyed in a short <br /> time. Conks are only occasionally seen on trees with <br /> pocket dry rot. An accurate indicator of the place <br /> formerly occupied by a conk is a cup- shaped <br /> depression, called a shot -hole cup. These depressions <br /> in the bark are caused by woodpeckers searching for <br /> insects at the base of an old conk. A conk or a shot - <br /> hole cup always indicates that the bole is decayed <br /> from ground level to a height of 10 to 50 feet above <br /> the conk or cup. <br /> Two other trees have open scars with extensive pocket <br /> dry rot visible. A shot -hole cup may be present up <br /> the bole upon further investigation. <br /> In my opinion these trees present a current hazard. <br /> I did not have the time to extensively examine the <br /> Telephones remaining trees. You indicated to me that the <br /> 503.687.4243 remaining trees all have Oligoporus amarus based on <br /> Agriculture, cores samples you collected. As time progresses and <br /> Home Economics, 4 -H the rot advances, the remaining trees will also become <br /> more hazardous. I concur with your recommendations to <br /> 503.687.4281 reduce the hazard. <br /> Nutrition <br /> 1- 800.872.8980 <br /> Fax <br /> 503.465.2377 <br /> °x°°"5"E "`ay Agrltu, H ome ics, H Yo h, Forestry, Conit Dlo <br /> EXTENSION ment, icu Ener and Extension Se 4 - Grant ut P Oregon mm State u Uni - <br /> , <br /> L SERVICE United States Department of Agriculture, and Lane County cooperating. The <br /> Extension Service offers its programs and materials equally to all people. <br />