Peach leaf curl
Peach leaf curl is a fungal disease which appears in peaches, nectarines and almonds.
The disease will first appear appear in spring after young leaves begin to unfurl. The first noticeable sign will be the appearance of greenish-yellow patches on the plant leaves. As the disease advanced, these patches will change colour to crimson. Later, the leaves will thicken, curl, crumple and finally drop off. In extreme cases, this may leave the plant completely defoliated.
Treatment is typically applied with a fungicide, the Bordeaux mixture.