Over watering of peach tree?

Hi there,

  New here and a new grower, i just planted a peach tree in the ground, peach tree came from Costco. it's about 4 ft tall and fruited a lot this year. But in the last week I started seeing the leaves turning purple, yellow curling etc. The fruits don't seem to have an issue yet. Any odea what disease this is? or is it overwatering? Have some pics attached. It gets at least 4-5 hrs of sun everyday. Watered by 2GPH dropper for 1 min in the mornign 3 mins in the evening.

Regards

A 2 GPH dripper doesn't provide much water in 3 minutes. GPH is gallons per hour. There are 60 minutes in an hour and 128 ounces in a gallon. 3 minutes with a 2GPH dripper is just over 12 ounces of water. I'd say you aren't watering enough, especially now that the fruit has set.