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Dwarf Scots Pine - Branch Dying


I recently bought a nice-sized P.s. 'Beuvronensis' from a local landscape nursery. It's has nice, compact, short-needled foliage and looked to be in perfect health. I've had it for about 6 weeks and over the last 3-4 weeks I've had a branch mysteriously die. It's the thickest branch of a 3-branch whorl off one of the main branches (does that make sense)...I only mention that because the other branches in this group are perfectly healthy and it's not like this branch was alwaysthe weakest of the group.

I've really done very little to this tree since I've gotten it other than watering. I did remove a branch on the other side of the tree that I knew I would never use as part of the final bonsai design...but it's nowhere near the lifeline for this branch, and, like I mentioned, the other sub-branches on this branch are just fine.

So, any ideas what I should look for?

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Check for a pin hole in the base of the branch.
It could be a mining insect that has effectively cut the branch off at the base.

It could also be a watering problem, but I doubt it because of the 2 branches of the whorl are ok. Pin roots generally grow on the same side of the branches they effect. Check that the soil directly under the branch is getting water.

Sometimes those nursery soil balls are compact and non-even on top, preventing a good thorough watering. When you water it, make sure you are watering it 3-5 times, every 30 seconds or so to make sure it is fully soaked.