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After pupating within the ash host, EAB adults emerge in the Spring. Image: James Zablotny Ph.D. |
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Exit holes are sometimes found low in the tree trunk. Image: Gerald Wheeler |
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Soon after the adults emerge they mate and lay eggs. Image: Brian Sullivan |
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Infested ash hosts may have cracked bark due to larval feeding damage to tissue. Image: Gerald Wheeler |
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Females search bark for an appropriate place to lay their eggs. Image: Brian Sullivan |
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In old or heavy infestations, cracks and split in the bark are external symptoms of EAB larval feeding. Image: Gerald Wheeler |
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Once found, female EABs lay eggs on bark. Image: Brian Sullivan |
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Infested ash trees initially show yellowing leaves. Image: Gerald Wheeler |
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EAB larvae are often found boring galleries near the bases of branches as this location provides them some protection from woodpecker predators. Image: Gerald Wheeler |
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As the infestation progresses, trees lose their leaves prematurely. Image: Gerald Wheeler |
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Spathius agrili uses its long egg-laying organ to drill through the bark to lay eggs inside EAB larvae. Image: Jonathan Lelito
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Thinning crowns in ash trees are a suspect of possible EAB infestation. Image: Gerald Wheeler |
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Larvae bore galleries in the wood, pupate within these gallery spaces, and emerge through holes in the spring. Image: Gerald Wheeler |
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Beneath the cracked bark, evidence of heavy larval feeding can be seen. Image: Gerald Wheeler |
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Here, an adult ready to emerge, can be seen within the wood tissue. Image: Gerald Wheeler |
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An adult EAB lives less than 30 days after emergence.. Image: James Zablotny Ph.D. |
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Close view of gallery and exit hole. Image: Gerald Wheeler |
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The emerald ash borer thus far, is host specific; all 16 species of Ash are at risk for EAB. Image: Brian Sullivan |
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Larval feeding, resulting in frass-packed galleries, can cause extensive damage to host. Image: Gerald Wheeler |
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EAB have a distinctive iridescent green and copper color, and a bullet-shaped body typical of buprestid beetles. Image: James Zablotny Ph.D. |
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The D-shaped exit hole matches the body contour of the EAB; a flat back and round underside. Image: Gerald Wheeler |
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The bullet-shaped body of EAB is typical of beetles in the family Buprestidae. Image: S. Ellis |
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This view of stripped bark illustrates the typical “D” shape of the exit hole. Image: Gerald Wheeler |
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Dorsal view of EAB. Image: James Zablotny Ph.D |
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Trees bearing D-shaped exit holes have been infested from the previous year. Image: Gerald Wheeler |
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Ventral view of EAB. Image: James Zablotny Ph.D |
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The D-shaped exit holes are small and may be obscured by the texture of the bark. Image: Gerald Wheeler |
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Frontal view of EAB head. Image: S. Ellis |
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Close view of D-shaped exit hole with bark partly removed. Image: Gerald Wheeler |
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EAB larva. Image: S. Ellis |
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Female Spathius agrili parasitize EAB larvae by drilling through the bark and laying up to 20 eggs on its host. Image: Tracy Ayer |
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Oobius agrili injects its egg in the egg of an EAB, where it will hatch, grow and kill the host egg. Image: Jian Duan |
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Female Spathius galinae targets EAB larvae. Its long egg-laying organ (ovipositor) enables the wasp to parasitize EAB larvae in larger, more mature ash trees that have thicker bark. Image: Jian Duan |
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