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    A five year investigation of the cause of rapid crown decline and mortality of bitternut hickory was concluded in September 2011. Results of a series of related studies found that multiple cankers and xylem (the water conducting tissue) dysfunction caused by Ceratocystis smalleyi are correlated with rapid crown decline typical of a limited vascular wilt disease. Because reproductive attacks by the hickory bark beetle (Scolytus quadrispinosus) also are correlated with canker and xylem lesion occurrence, the synergistic interaction of the beetle and the fungus in combination with host stress (e.g. drought) is important in disease development. This disease has been referred to as hickory decline or hickory dieback in the past several decades; however, the researchers propose hickory wilt as a more appropriate name based on their recent findings. A brief synopsis of the key results supporting these conclusions is presented in this report.

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    Juzwik, Jennifer; Park, Ji-Hyun. 2011. Additional pest surveyed: hickory decline. In: Iowa's forest health highlights. DesMoines, IA: Iowa Department of Natural Resources: 40-42.


    Fusarium solani, Ceratocystis smalleyi

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