How do I control leaf curl and peach fruit fly in my peach orchard?

The thick, curled, reddish, puckered leaves in spring are peach leaf curl, a fungal disease (Taphrina) that infects as buds swell in cool wet weather. The crucial point is timing: it must be controlled with a dormant or bud-swell spray of a recommended fungicide such as copper or Bordeaux mixture before the buds open; once leaves are curled, spraying does not cure them, so the spray is preventive and applied in late dormancy. Rake and destroy fallen infected leaves to reduce inoculum. The maggots in fruit are fruit fly (and sometimes the peach fruit borer). Manage fruit fly with methyl eugenol traps from before ripening, strict collection and destruction of fallen and infested fruit daily to break the cycle, and fruit bagging on premium trees; use recommended bait or cover sprays only at label dose with the correct pre-harvest interval since the fruit is eaten fresh. Orchard sanitation plus the well-timed dormant fungicide spray handles both problems.