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https://www.naturespot.org.uk/species/oak-jewel-beetle
The larva of Agrilus biguttatus develops exclusively in different species of oak. After hatching the beetles feed on the oak foliage in the crowns of the trees. In sunny and warm weather the beetles sit on the leaves of the breeding trees, or on trunks or bushes and trees nearby. They are not found on blossoms.
https://species.nbnatlas.org/species/NBNSYS0000141287
Agrilus biguttatus is a species of beetle in the family Buprestidae, the jewel beetles. Common names include oak splendour beetle, oak buprestid beetle, and two-spotted oak borer. I It is native to Europe, North Africa, and Siberia. T This beetle is known as a pest that causes damage to oak trees and is a factor in oak decline.
https://www.thoughtco.com/jewel-beetles-family-buprestidae-1968126
Mar 02, 2019 · Jewel beetles sometimes emerge from wood products, such as flooring or furniture, years after the wood was harvested. Several records exist of buprestid beetles emerging 25 or more years after they were believed to have infested the host wood.
https://mygreatbritishadventure.com/tag/oak-jewel-beetle/
Mar 29, 2016 · You can tell an infected tree by the emergence of a dark fluid oozing from cracks in the bark caused by the so-called oak jewel beetle – and death occurs within a mere four or five years of symptoms first appearing. But again the importance of the oak to this land in symbolic rather than pure biodiversity terms cannot be underestimated.
http://www.uky.edu/Ag/Entomology/treepestguide/oak.html
Apr 17, 2020 · Larvae are active all summer and feed in the cambium. The feeding damage progresses from the bottom, up the tree, girdling it. Trunks are often deformed and sucker growth may also be seen. As adults they are copper-colored jewel beetles that emerge in May.
https://www.barkbeetles.org/Buprestidae.cfm?subfamily=Agrilinae
metallic wood-boring beetle: Agrilinae: Coraebini: Coraebus florentinus (Herbst 1801) metallic wood-boring beetles: Agrilinae: Coraebini: Coraebus undatus (Fabricius, 1787) Wellenbindige oak splendour beetle: Agrilinae: Coraebini: Eupristocerus spp. Deyrolle 1864: alder gall buprestid: Agrilinae: Coraebini: Coraebina: Lius poseidon Napp, 1972 ...
https://edis.ifas.ufl.edu/pdffiles/EP/EP59600.pdf
Insect borers include many species of beetles, moths, and wasps that tunnel into the trunk and branches of trees, where they feed and reproduce within the woody tissue. There are several different borers that attack oaks, including flathead borers (Buprestid “jewel” beetles), roundhead borers (Cerambycid “long-horned” beetles), ambrosia
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