In the past, I've purchased dormant oil spray at Franks Nursery or one of the home centers like Home Depot or Lowes. I use a backpack sprayer and now is a good time to spray them. I saturate all parts of the tree(trunk and branches). It's also a good time to prune your fruit trees. Remove any vertical shoots and open up the trees by removing some of the interior branches so sunlight gets in. The fruit grows on the branches that grow on an angle or horizontally, not on the vertical growing branches. You can also fertilize the trees with granular fertilizer or fruit tree spikes.
Dormant spray is a highly refined oil that smothers insects such as mites that overwinter on the trees. In addition, any good nursery, garden center or hardware store will carry a general purpose orchard spray. This will contain an insecticide and a fungicide. It should be applied according to the label directions throughout the season. The label will tell you how long before anticipated harvest to stop spraying.
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