Andred:

Unfortunately, nothing stops peach leaf curl once it is underway. The best you can do is to hope for a change in the cool, rainy weather and regrowth of the leaves.

Prevention is the key to peach leaf curl control, and that can be achieved in a normal year by dormant sprays with copper. Bordeaux mixture does contain copper sulphate, but I prefer Kocide, which is copper hydroxide, as a dormant spray.

But even with several dormant sprays, curl can appear when the weather conditions favor it, and that is the unfortunate case this spring. You can apply Bordeaux mixture, but I am afraid you will not notice much difference at this point.

Keep your peach tree pruned so that it is able to dry out quickly between rains in the spring. That will retard development of the curl, and also help your peaches, which require sunlight to size up and sweeten. I am pruning my peach trees heavily right now, just at thinning time, to allow more light on the fruit. Open up the center. Darkness is the enemy of peaches and peach trees.

Don Yellman, Great Falls, VA

Thanks Don, I think I'm going to give it a prune.