This study was conducted to prolong the harvest date and enhance the fruit quality of 'Monroe' peaches. For this purpose, ReTain containing 15% aminoethoxyvinylglycine (AVG) was applied to the peach fruits. AVG at concentrations of 0, 100, 150 and 200 mg l(-1) was sprayed on the peaches 7, 21 and 30 days before commercial harvest. Some fruit quality parameters [fruit weight (g), fruit flesh firmness (N), soluble solids content (SSC, %), titratable acidity (TA, %), fruit colour (L*, a*, b*), sugar content, delay in harvest, ethylene production (mu l kg(-1) h(-1)) and respiration rate (ml CO2 kg(-1) h(-1))] were measured for each treatment. Fruit maturity was delayed about 4-6 days more in AVG-applied fruits than in the control group. A sequential harvest was completed 6-7 days before the normal harvest time. Application of AVG increased the fruit size and fruit weight of 'Monroe' peach. AVG-sprayed fruits were firmer than the fruits of control group. AVG applications also decreased ethylene production and the respiration rate of fruits. As a results, application AVG of 100 or 200 mg l(-1) concentrations 30 days before commercial harvest for 'Monroe' peach varieties can be recommended.