Quick answer: Pitch Canker in Monterey Pines — Trees on this coast live with fog, salt, wind and thin soil, and the work that keeps them healthy is decided by those conditions rather than by a calendar written inland. Structure, clearance and the root zone are what a tree here needs looked at, and small work done early is what keeps a tree out of the emergency list.
Field note. What we see on this coast is that the trees people worry about are usually not the ones in trouble: the pine with a clean crown and a lean that predates the house is often sounder than the tidy tree that has been quietly drowning in its own root zone.
On the other hand, there is no schedule that suits every tree — the same species on two sides of one street can need opposite care, which is why we look before we recommend.
The first sign is usually a branch that has died for no reason you can name. Look closely where the dead wood meets the live wood and there is a patch of bark darker than the rest, often with resin running out of it in a way that has nothing to do with a wound. That is the signature. A pine that bleeds where nothing struck it is a pine with pitch canker.
Why the disease is at home here
Pitch canker is caused by Fusarium circinatum, a fungus that infects pines through wounds and through the tips of growing shoots. Monterey pine is the most susceptible of the common species on this coast, and Monterey pine grows here in dense stands along the same fog belt where the disease spreads most easily. A coast that suits the tree also suits the thing that kills it, which is a pattern worth remembering when a planting is being planned.
The beetle that carries it between trees is a small engraver that feeds in the same shoots, so an outbreak of beetles and an outbreak of canker tend to arrive together. Neither is a reason to panic. Both are reasons to look.
Reading a lesion properly
A pitch canker lesion is resin-soaked wood under bark that still looks intact. Cut a small window in the bark at the edge of the dead section — not in the middle, where everything is already dead — and the boundary is visible as a colour change. That boundary is the answer to the only question that matters: is it still moving?
If the lesion has stopped, the tree has walled it off and the dead branch is now just dead wood. If the boundary is wet and bright, the infection is active and will keep advancing toward the trunk.
What pruning can and cannot do
Where the infection is confined to branches, cutting well back into live wood — a good fifteen centimetres past the visible boundary — removes the infected tissue and gives the tree a chance. The cut has to be clean and the saw has to be cleaned between trees, because the fungus moves on tools as readily as on beetles.
What does not work is topping. A hard cut into the main stem of an infected pine leaves a large wound the tree cannot close, and the same fungus colonises it. Trees that are topped for canker usually die faster than trees left alone.
What a healthy stand looks like from the road
Driving past a row of pines, the ones with canker are usually the ones with a hole in the canopy. Not a hole where a limb was removed — a gap that opened on its own, with a dead top standing above it. A stand where the crowns still meet has not been spared the disease; it has simply not reached the stage where it shows.
That is the reason a survey is worth doing every few years rather than only after a tree dies. The infections that will matter in five years are in branches now, and a branch is a cheap thing to remove. A trunk is not.
The trees that cannot be saved
When the lesion reaches the trunk, or when several main limbs are affected at once, the arithmetic changes. A pine with canker in the stem is a declining tree with a decaying core, and on this coast a declining pine in wind is a hazard. That is a removal decision rather than a pruning one, and it belongs in a hazard evaluation rather than a quote given from the driveway.
What actually reduces the risk
Do not move firewood. The single most effective thing a homeowner can do about pine disease on this coast is to stop carrying cut pine from one property to another, which is how a great many of these infections travel.
Keep pines out of summer irrigation, avoid wounding trunks with string trimmers and mowers, and have storm-broken limbs cut cleanly rather than torn. None of that is dramatic. All of it is the difference between a stand that holds and a stand that thins out over a decade.