Life history and potential control of Pityophthorus juglandis in east Tennessee

Pityophthorus juglandis, a newly discovered invasive pest species in eastern Tennessee, threatens to significantly diminish populations of Juglans nigra (black walnut) throughout its native range.  Since little is known about P. juglandis in Tennessee, the flight activity, habitat behavior, and life stages are being evaluated to better understand this pest. Also, two insecticides (imidacloprid, dinotefuran) and one fungicide (potassium phosphite) are under evaluation as potential chemical control agents for P. juglandis and the thousand canker disease.  In addition, three clerid species have been discovered in the eastern US that feed on P. juglandis.  Tests are underway to determine the impact of clerids’ as biological control agents for P. juglandis.