Every time I mix up some new cultures at least three of them become sour and begin giving off a really disgusting smell; does anyone know why this happens? Also the culture mix I use is purchased from a company not home made.
are you using yeast? If so, how much? In my experience, my cultures will put off a foul odor for a few days. Once the instars (larva) start processsing the medium, the foul smell is eliminated and the meddium seems to take on a slight, sweet smell. My suggestion would be to watch for mold and discard any that have black mold growing in them.