Brook,

I think your Elberta suffered more freeze damage than other peaches. If so, this is not unusual. Odds are very small sprays, heat, insects would affect just one tree. Nor have I seen too much rain cause fruit drop on peach trees. They retain their fruit until they collapse. I've seen pears drop fruit from too much water.

I recall a few years ago, we had a damaging late freeze and some peach trees had very thin crops while others had full crops. I strongly suspect this is what happened to you.

Redskin was one of the cultivars unaffected. It's interesting one of its parents is Elberta, the other Redhaven. Perhaps it got it's hardiness from Redhaven, since your Elberta was so affected.

Old Pea, thanks. Yeah, I thought as much. We had two hard freezes 4/10 and 4/11. Some fruits were immediately affected, but a week later I began thinning. Many fruits were slightly discolored but didn't have the tell tale wrinkling that indicates ruined fruits. I just find it strange that it took them nearly a month to drop and that it was only on the one tree.