If a pine tree is relatively healthy then the pitch will seal the top relatively quickly. If the tree does not have enough pitch to seal the top then it also does not have enough pitch to reject pine borers and will most likely be dead in a year anyway. Therefore trying to outthink Mother Nature...
First off you need to figure out what is causing the decline. Without a good idea of why it's declining then you have little chance of arresting the decline. I think trees like this are a great learning experience because you have a client willing to try and save the tree. Pay very close...
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