I wouldn't say it's to be expected. I've never seen any grasshoppers hatch out of Promix in the decades I've used it. Or other bugs. How strange.

Over the years, I have used many ProMix bales and have never seen anything but mix. I have seen a housefly on rare occasions, but I am pretty sure it came in the door and had nothing to do with the mix. I guess Canada will have to survive without you.

If you think it's the Promix, I can't blame you for not wanting to use it in your basement. Or indoors in general, heh. Unless you keep a spider population that would be happy about it :) Have you cracked open the second bale?

No, I haven't opened the second bale. I don't think I'll need it indoors, I don't have too much else to start; I'll use it up outside when I make my container mix.

Ive had problems with fruit flies in my promix. I bought some BT to kill them. I can't say for sure they came from the promix? My beef about the promix is that it dries out too fast. Adding vermiculaite would help. I like the fact that promix has michorizae. I could cook my promix in the oven, but that would also kill all the michorhizae.

Fruit flies don't/can't live in soil. What was most probably encountered were fungus gnats. Fungus gnats feed off of decaying organic matter in the soil mix and are encouraged by excessive moisture retention.

Sorry mxk3, I meant to say fungus gnats. Coffee hadnt kicked in. I better brew some more Lol. 😴☕️😳

^^ I deleted that comment, it wasn't meant toward you, Jay, but I can see how you might have felt it was.