Peach tree fruit not maturing.

SproutMeKate1 says...
there could be a number of reasons for fruit drop at that size. it could be an issue of too much/little fertilizer, incorrect timing of fertilizer, too much/little water, high winds, or some sort of infestation. sometimes fruit also drops if the tree doesn't have a sufficient root system to provide nourishment. unfortunately I can't really give you an actual answer based on the photo - just a list of possibilities.