Biology of the European oak borer in Michigan, United States of America, with comparisons to the native twolined chestnut borer

摘要

In 2010-2011, we studied the European oak borer (EOB), Agrilus sulcicollis Lacordaire (Coleoptera: Buprestidae), in Michigan, United States of America, and made comparisons with the native twolined chestnut borer (TLCB), Agrilus bilineatus (Weber). EOB adult flight began and peaked before TLCB. More EOB females were captured on purple and white compared with yellow and green sticky traps. More TLCB females were captured on purple, followed by yellow, green, and white, respectively. Male EOB and TLCB did not show a significant colour preference. EOB completed development primarily from areas of artificially girdled trees where the phloem had died soon after trees were girdled, while TLCB usually developed in areas of girdled trees that had some live phloem present. Both EOB and TLCB successfully attacked and emerged from girdled Quercus alba Linnaeus, Quercus robur Linnaeus, and Quercus rubra Linnaeus (Fagaceae) trees. No live EOB or TLCB were found in two ungirdled and apparently healthy Q. robur trees that were dissected. EOB attacked and emerged from Q. alba, Q. robur, Q. rubra, and Quercus velutina Lamarck trap logs. Differences in the pronotal groove and terminal processes can be used to distinguish EOB from TLCB larvae. Five species of parasitoids were reared from EOB and four from TLCB. Resume Nous avons etudie en 2010-2011 l'agrile europeen du chene (EOB), Agrilus sulcicollis Lacordaire (Coleoptera: Buprestidae), au Michigan, Etats-Unis d'Amerique, et l'avons compare a l'agrile du chataignier (TLCB), Agrilus bilineatus (Weber), une espece indigene. La periode de vol de EOB debute et atteint son sommet avant celle de TLCB. Plus de femelles EOB ont ete capturees sur des pieges collants violets et blancs que sur des pieges jaunes et verts. Le plus grand nombre de femelles TLCB a ete capture sur des pieges violets, puis par ordre sur des jaunes, des verts et des blancs. Les males EOB et TLCB ne montrent aucune preference significative de couleur. Les EOB completent leur developpement principalement dans des zones d'arbres anneles artificiellement chez lesquels le phloeme est mort peu apres l'annelation des arbres, alors que les TLCB se developpement generalement dans des zones d'arbres anneles chez lesquels il reste du phloeme vivant. Tant les EOB que les TLCB attaquent avec succes les chenes Quercus alba Linnaeus, Q. robur Linnaeus et Q. rubra Linnaeus (Fagaceae) anneles et en emergent. Aucun EOB ni TLCB vivant n'a ete trouve lors de la dissection de deux chenes Q. robur non anneles et a apparence saine. Les EOB attaquent les billes de chenes Q. alba, Q. robur, Q. rubra et Q. velutina Lamarck utilisees comme pieges (trap logs) et en emergent. Des differences dans le sillon du pronotum et des processus terminaux peuvent servir a distinguer les larves de EOB et de TLCB. Cinq especes de parasitoides ont ete obtenues par elevage de EOB et quatre de TLCB.