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The larvae make long serpentine galleries (up to 26-32 mm long) into the sapwood, which enlarge as they grow and are filled with brownish sawdust and frass. Callus tissue produced by the tree in response to larval feeding may cause vertical splits, 5-10 cm long, in the bark above a gallery. Newly emerged adults bore 'D'-shaped (3-4 mm diameter) exit holes on trunks and branches. As the larvae damage the vascular system, attacks cause general yellowing and thinning of the foliage, dying of branches, crown dieback and eventually death of the tree after 2 to 3 years of infestation. Basal sprouting and also the presence of woodpeckers may indicate wood-boring beetle activity. After 1 to 2 years of infestation, the bark often falls off in pieces from damaged trees, exposing the insect galleries.
Since the discovery of A. planipennis in North America in 2002, various control methods have been studied and implemented.
In North America and Europe, A. planipennis attacks and kills healthy trees. Thus, the silvicultural methods to maintain or enhance tree vigour, which are usually applied to prevent the attack of most bark and wood-boring insects are of little value.
To prevent the emergence of adults from dead or cut trees, mechanical destruction of infested trees through chipping, grinding or heat treatment is recommended (McCullough et al., 2007).