The mothers of a lot of borers are attracted by the the chemicals emitted by the trees under stress or dying. So they may have laid their eggs inside even before you noticed that the tree was in serious trouble. The adult form can bore the bark to get out when the limb/ tree is still alive. The...
They are the outcome of a tree's defense against the little borer insects attracted by its weakness. Filling the little tunnels with sticky glue surely annoys them.
It isn't usually a good sign, even if I saw once a Cedrus fully recovered after a massive attack.
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