That scar has the appearance of one long gash, but it's really multiple holes in a long line, spaced very closely to one another. When the scar is fresh, it's much easier to see the multiple holes. The larvae that come out are tiny. Like just a single mm or so long.
I saw a couple of them after they hatched and dropped down onto the roof of my car. Only reason I was able to see them is that they left a trail in the morning dew. At the end of a foot long dew trail, there was a little squirming speck of a worm.
edit: damn I type slow.
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