This is the time of the year to spray deciduous fruit trees with dormant spray. It kills the over wintering diseases, like peach leaf curl, rust, powdery mildew, and more. You spray it right on the bare branches of the tree. Spray thoroughly, to the point of runoff. I use sulfur spray with horticultural oil mixed together in the spray tank. 
The oil kills overwintering bugs that hide in the cracks and crevices during winter. Organic gardeners should be sure to do a dormant spray, as it will mean using less sprays later in the season.
If you have apricots use copper instead of sulfur. It does the same thing as sulfur, but wont damage the apricot plant like sulfur will.
I'll be holding a winter care of fruit tree workshop in January. Follow the linkhttp://www.thegoldengecko.com/workshops.htm to our web page where we have posted the dates and times.