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Relation of color, size, and canopy placement of prism traps in determining capture of emerald ash borer (Coleoptera: Buprestidae)

  • Joseph A. Francese (a1), Ivich Fraser (a2), Michael L. Rietz (a2), Damon J. Crook (a1), David R. Lance (a1) and Victor C. Mastro (a1)...


In 2008 we compared numbers of emerald ash borer, Agrilus planipennis Fairmaire, captured on glue-coated prism traps of different sizes (standard, double-length narrow, and quarter), colors (green and purple), and height in relation to the canopy of ash host trees (midcanopy (10–13 m) and ground level (1.5 m)). Standard-size prism traps caught more A. planipennis than did quarter-size prism traps, but catch per square metre of surface area did not differ significantly among the three trap sizes. Twenty percent of quarter-size prism traps failed to catch a single beetle, while all traps of the two larger sizes were successful. The larger traps therefore appear to be more useful as detection tools. In 2009 we compared purple and green standard-size prism traps at three heights: midcanopy (13 m), lower canopy (6 m), and ground (1.5 m). Green traps caught more adult emerald ash borers than did purple traps in the mid and lower canopy, but there was no difference between traps hung at 1.5 m. The ratio of male to female adult emerald ash borers was also higher on green than on purple traps at all three heights.

En 2008, nous avons comparé les nombres d'agriles du frêne (EAB), Agrilus planipennis Fairmaire, capturés sur des pièges en forme de prisme et enduits de colle, de taille (standard, étroite de longueur double et réduite à un quart), couleur (vert et violet) et hauteur (à mi-feuillage (10–13 m) et près du sol (1,5 m)) différentes en relation avec la canopée des frênes hôtes. Les pièges prismatiques standards capturent plus d'A. planipennis que les pièges d'un quart de taille, mais les captures par m2 de surface ne diffèrent pas significativement entre les trois tailles de pièges. Vingt pour cent des pièges prismatiques d'un quart de la taille n’ont attrapé aucun coléoptère, alors que tous les pièges des deux tailles supérieures ont réussi à en capturer. Les pièges plus grands semblent donc être des outils de détection plus utiles. En 2009, nous avons comparé les pièges prismatiques violets et verts de taille standard à trois hauteurs, soit à mi-canopée (13 m), au niveau de la canopée inférieure (6 m) et près du sol (1,5 m). Les pièges verts capturent plus d'adultes de EAB que les pièges violets dans la canopée intermédiaire et inférieure, mais il n’y a pas de différence entre les pièges pendus à 1,5 m. Le rapport des mâles sur les femelles de EAB est aussi plus élevé sur les pièges verts que sur les pièges violets aux trois hauteurs.

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