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In the summer of 2015, some accessions of the National Collection of Genetic Resources for Pecans and
Hickories (NCGR-Carya) were found to be infected with Pecan Bacterial Leaf Scorch, incited by Xylella
fastidiosa, a bacterial pathogen that can cause chronic disease associated with reduced yields. The pathogen
is vectored by common insects resident in Repository orchards. Duplicate tests on symptomatic materials
performed by different laboratories obtained differing results. We immediately began to refine diagnostic
protocols to ensure reliable results. We also discontinued distributing graftwood to any requestor,
domestic or international, until we could verify that materials were free of the disease. No graftwood has
been distributed from our collections since the summer of 2015. We are actively engaged in cooperative
research with a national team of scientists, developing improved methods of disease detection, coupled with
improved distinction of symptom expression. The inventory of the NCGR-Carya is being screened using those
improved techniques. When those tests have been completed, we will resume graftwood distribution from
disease free accessions, following the Distribution Guidelines of the National Plant Germplasm System.