Dormant oil spray is used as a preventative measure to protect plants (especially fruit trees) against insects like scale, aphids, and mites. These insects may hide in the plant’s branches over the winter, and some also lay their eggs in the branches, which then hatch in spring and feed on the tree’s new growth.
Dormant oil sprays are an environmentally conscious and effective way to minimize the damage insects can cause to fruit trees. There are several ways to make a homemade version of dormant oil spray from ingredients that are already found in most homes. Homemade sprays are just as powerful as commercially available options, provided they are made and applied correctly.