Apple trees are subject to pest and disease problems from the moment that they put out their first blossoms to the point where the leaves fall off seasonally. Because of this, farmers and home owners who want to produce a healthy apple crop must constantly spray their trees to reduce the chances of pests, mildew and disease. Spraying an apple tree once the leaves are on is no more difficult than spraying them at any other time during a season.
Select a multipurpose fungicide and insecticide formulated for apples to spray your tree. You may have to switch fungicide and insecticide brands periodically over the year to prevent pests and disease from building a tolerance to the spray.
Mix the chemicals according to the package instructions. Some chemicals come in concentrated form that must be mixed with water.
Pour the mixed chemicals into the holding tank of a chemical sprayer. Prime the pump of the sprayer to build pressure by grasping the pump lever up and down.
Grasp the holding tank in one hand, and the application wand in the other hand.
Activate the wand by squeezing the trigger to release a fine spray of chemical.
Apply the chemical to the tree by waving the wand over the tree using broad, even strokes.