Weird pest problem on my Amelanchier
I've got a Service Bush (Amelanchier) growing in a pot in my garden, and it's been showing a bit of reduced vigour this year which I put down to the dry/hot weather.
But then I spotted some weird reddish bobbles on the soil surface below it, and on further examination, these seemed to be somehow coming out of a depression low down on the trunk. Looking up the trunk I found a hole, maybe like a grub flight hole?
The bobbles don't seem to be alive. What's going on? And what can I do about it?
I've taken pictures -- here's the odd depression that's shedding the bobbles, with the bobbles in attendance:
and here's the hole I found further up the tree:
It got some wind damage earlier this year, which cracked the stem/trunk a bit. I think this might be in the same place.
There's about a 50cm of trunk (stem?) between the two signs of damage, and the leaves and berries are mostly looking fine, weirdly. No wilt, no die back (yet).
Anyone know what my pest is, and what I can do about it? I'm fond of the plant, and it has a lovely shape.