Knowledgebase
What's wrong with Peach Tree (#3) #871982
Asked June 06, 2024, 10:55 PM EDT
Alpena County Michigan
Expert Response
The only time to treat peach leaf curl preventatively with a fungicide is in the Spring just before bloom. In addition, you should remove infected leaves and not mulch them into the ground.
Since your site has a history of peach leaf curl, I would suggest 2 fungicide applications on a 7 - 10 day interval. The safest, effective fungicides available for backyard peach trees are copper soap (copper octanoate) or copper ammonium and are known as fixed copper fungicides. Apply either of these copper products with 1% horticultural oil to increase their fungicidal effectiveness. The synthetic fungicides chlorothalonil, ziram, carbamates and ferbam are also very effective. When using fungicides, be sure to read the label before use and apply according to instruction.