Re: Does salt or sugar affect the growth of mold on bread?

Yes, salt or sugar in small amounts are used to grow molds but in high
amounts will retard the growth of the mold. Salt has been used for centuries as 
a preservative because large amounts can prevent food from spoiling [from mold
growth] even under warm conditions.
Most commercial breads have preservatives such as salt and sugar in them so
you will have to make some homemade bread to do your experiment. You can
vary amounts of salt and sugar and see what organisms grow on your bread
under warm conditions. Rhizopus stolonifer is a common fungus that produces 
molds on bread. It has black spore balls that can be seen with the naked eye.