Arrrghhh! I just picked up a bag of triple mix and found:

http://www.reptiles.org/~gwen/ant.jpg

underneath. Should I worry about them? They're grossing me out something
fierce [I don't know if the little red ants are showing up - but the
white things look like cocoons not maggots.

I'm in Toronto, ON - Zone 6a.

cheers!
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"A cat spends her life conflicted between a deep, passionate and profound
desire for fish and an equally deep, passionate and profound desire to
avoid getting wet. This is the defining metaphor of my life right now."