As most fruit growers would tell you, fruit trees such as the apple tree require regular applications of liquid fruit tree spray to prevent infestations of bugs, fungus and diseases. Spraying is needed both before your trees leaf out and after the leaves are on your tree. Apple diseases that regular spraying will prevent include black rot, leaf spot, sooty blotch and apple scab. Bugs that infest apple trees include tent caterpillars and aphids. Administer sprays when your apple trees are in blossom, after the blooms have fallen from the trees and every two weeks after that until a week before your apple harvest.
Put on protective clothing, including eyewear, gloves, a long-sleeved shirt and long pants, and breathing protection.
Mix chemicals according to package directions.
Pour chemicals into a pump-spray applicator. Grasp the pump lever, and pump it up and down to prime the spray applicator.
Grasp the spray wand of your applicator in one hand, and carry the holding tank with the chemicals in the other. Hold the spray wand away from you, and turn it on. The chemicals should emerge from the tip of the wand in a fine mist.
Use even strokes to distribute the mist over the trunk, branches and leaves of your apple tree.