Whitewashing fruit tree trunks prevents sun damage on exposed tree trunks and branches. Young trees, cold-damaged trees and bark newly exposed by pruning is especially susceptible to sun-scald. The white paint reflects paint away from the the trunk and protects it from heat in the early spring.
Mix 1 gallon of white exterior latex paint with 1 gallon of water. For rough bark, add more water to a portion of the paint for the first coat.
Stir the paint often to maintain a smooth mixture.
Paint or spray the exposed trunk and lower branches. Avoid getting paint on the leaves.
Allow the paint to dry, then apply a second coat.