out door shrooms

I have a spot under some hanging plants that the ground under them i use for a soil and veggie compost no meat. always have 3 or 4 mushroom growing in the area. I had a jar that refused to do a full spawn guess not enough water. I throw the cultivated half tucked half way in compost in a very moist area. 3 days now it is covered in these little white bugs look like spider mites but are white and much smaller any ideas what they are and if they are bad.

Dat sloppy joe. Lemme see dat sloppy red.