Does anyone know what disease or nutrient deficiency would cause peach leaves to grow long and skinny?

My Q-1-8/ Frost combo has weird leaves this year, and it's 6 years old and has never done this before. They are about 1/2" wide, on both sides, skinnier than even my almond tree leaves. It also took forever to leaf out. It's the only one of all my peach or nectarine trees that is doing this.

Ideas?

Carla in Sac