Jerseygirl: It sounds like you might have had bacterial blight. I believe it can be controlled with copper sprayed while the tree is dormant. I only had this issue twice and never had it again so I am no expert on it. I would suggest you spray to prevent peach leaf curl but perhaps is is not an issue in your area. It is for me. I spray in late March while the tree is dormant with chlorothalonil. This controls it nicely. I am attaching a photo so you know what curl looks like if you get it.

Even though your tree may be in full sun, the peaches aren't getting the sun because it appears that you're growing the tree with a central leader system. Peach trees need to be pruned to an open vase system that allows the sunlight to get to the fruit.

Lilacs: Your peaches have been visited by the oriental fruit moth. The damage probably occurred some time ago, but is now becoming easily visible due to the oozing of pectin. The peaches may continue to ripen (although some may fall), but when you take them down the affected peaches will be seriously deteriorated around the pit area, and some larvae may be present. I don't know how long you have been growing peaches, or the severity of OFM pressures in your particular part of Colorado. In my area of Northern Virginia OFM is a constant presence from early spring right through midsummer. I either have to spray in a timely manner, beginning right at the fruit thinning stage, or bag the peaches in shoe store "footies", or both. I would expect OFM pressure to be less in the dryer, higher climate of Colorado, but in a given year it could be pretty bad. Weather has not caused your peach problems, nor is it a disease. It's a very nasty moth. Don Yellman, Great Falls, VA

Thanks for the input. Is it your experience that peaches are thirstier than other trees? My concern is that it seems to use much more water than everything else. Also, any ideas on the leaf spots? I forgot to mention that they get water once a week 20 minutes from Nov-June and twice a week 15 min from July-Oct. When temps exceed 88 they get an extra 50%. I spaced the fruit about 6" but I allowed fruit closer if they were on alternating sides of a stem (i.e., growing away from each other). Is this ok, or should I prune more fruit? AFA the spraying goes I tend to go after everything in the edibles section early before the damage begins. The frequency is due to the very mild potency of this stuff, which is gone in a week, especially with the heavy dew we get overnight from now through June. We just get a lot of munchers here, especially caterpillars/worms/lopers. I will lay off the peach tree until I see something.